Title of Invention

METHOD FOR CALIBRATING A TRANSMITTER AND A RECEIVER PATH OF A COMMUNICATION DEVICE AND TEST SYSTEM

Abstract The invention relates to calibrating a transmitter or a receiver path of a communication device (3) a communication tester (2) is provided and connected to the communication device (3), The communication device (3) and the communication tester (2) are capable of transmitting and receiving bursted signals. Test parameters for a test sequence for calibrating the transmitter path (34) or receiver path (35) of the communication device (3) are interchanged and both devices are set into a test mode. Then the test sequence is started and test signals are transmitted and received without additional exchange of test parameters, RF parameters of the test signals are measured and used for calibration.
Full Text The invention relates to a method for calibrating a transmit-
ter path of a wireless communication device, the communica-
tion device comprising an operational mode for bursted sig-
nals. The invention further relates to a method for calibrat-
ing a receiver path of a wireless communication device. The
invention refers also to a test system for calibrating a com-
munication device.
After assembly of a mobile communication device, the device
has to perform an extensive testing procedure to ensure a
correct functionality of the device. The communication device
can be a mobile phone, a PDA or a notebook having a wireless
LAN communication. Such mobile communication device to be
tested is referenced hereafter by "device under test" or
"DUT" as an abbreviation. The testing procedure is performed
in a test system environment. The test system comprises a
signal generator or a communication tester capable of gener-
ating RF signals.
Some tests require the generation of a signal according to a
mobile communication standard. Transmitting such a signal is
called signaling mode The used communication standard can be
GSM, WCDMA, Bluetooth, WLAN or the like.
For example the communication tester within the test system
generates a signal according to the GSM mobile communication
standard, if functionality of a receiver path of a GSM mobile
is to be tested. The GSM mobile phone is the device under
test and connected to the communication tester via a communi-
cation line. This communication line is used for test parame-
ter exchange. Using the communication line the tester sends
all parameters for the tests to be performed.
A test signal is then transmitted and receivwed by the DUT.
The device measures signal parameters of the test signal and
demodulates the signal. Some signal parameters* for example
frequency or power levels* are sent back to the communication
tester via the communication line. The communication tester
compares the signal parameters measured by the receiver of the
MJT with the signal parameters transmitted to the DUT. It
calculates calibration parameters dependent from the parameters
of the received signal and the transmitted signal. The
calibration parameters are stored in a memory within the mobile
communication device. The stored parameters can be used later to
calibrate and optimize the receiver path during normal operation
mode of the device. In a similar way the transmitter path of the
device under test is tested by generating a signal and
transmitting the signal back to the communication tester.
Kn actual test systems) the device under test and the
communication tester communicate with each other after having
transmitted or received a test signal. After evaluation of the
measured parameters of the test signal a new frequency or power
level is selected and communicated over the communication line.
The test will be repeated with the new test parameters.
The use of the signaling mode and the communication between the
DOT and the communication tester after each teat of predetermined
signal parameters results in a very slow testing procedure.
EPO 42O»O3 discloses a method of tuning and compensating power
levels in a radio telephone, in the method according to the
invention, the tuning information determined by a measuring
computer When the radio telephone is in operation the microprocessor (IO>
receives from the sensors (H4) information e.g. about the
temperature, and it selects from its memory tuning information*
with which the transmitter (Hi) power is controlled vis. a D/A-
ronverter (55), The tuning can be made automatically, without
opening the casing of the radio telephone.
KPO 4-2O5O7 discloses a method of tuning and compensating the
received signal strength indicator in a radio telephone.
According to the tuning results for selected operating conditions
are stored in the microprocessor (1O) memory. When the radio
telephone (X) is in use, the received signal strength indicator
(RSS1) reading is corrected with the tuning result in order to
select the strongest antenna signal. The tuning is performed by
connecting the tuning equipment to the external interfaces
(31, 3'.-?) of the radio telephone without opening it.
An object of this invention is to provide a method for
calibrating the transmitter or receiver path of amobile
communication device, which allows a reduced testing time. A
further abject af the invention is to provide a test system
having calibration cycle* which is performed in less time.
According to an embodiment of the invention a transmitter path
of a communication device to be calibrated comprises an operating
mode for bursted signals. Preferably it is designed to transmit a
test signal according to a time division multiplexing
transmission method. The communication device will referenced to
as device under test or DUT. After having provided a
communication tester comprising a test mode for measuring signal
parameters of a received signal the DUT to be tested is provided.
The device under test and the communication tester ttru connected
together via a communication line. Then» a plurality of test
parameters for signals to be transmitted during the test
procedure are communicated between the DUT and the communication
tester via the communication line. After exchanging the test
parameters the DUT as well as the communication tester will
follow a determined test procedure set forth by the test
parameters. Then, the device under test is set into a test mode
and the test sequence is started. The DUT starts transmitting a
plurality of predetermined test signals according to the
exchanged test parameters using a time division multiplexing
transmission method. Thus the DUT will transmit a plurality of
different bursted test signals. Each burst is determined by a set
of parameters and transmitted in a time slot. The communication
tester receives the transmitted test signals. Thus* the
calibration parameters mrm calculated and stored in the
communication device in such a way* that they can be used for
calibrating and optimizing the transmitter path during normal
operation.
Applying this method for calibrating a transmitter path signifi-
cantly reduces the time for the test procedure. This is achieved
by interchanging a plurality of test parameters for the test
sequence between the DUT and the communication .................
tester via the communication line before starting the test
sequence. The communication device as well as the communica-
tion tester will follow determined rules and settings when
transmitting or receiving test signals. These test signals
are transmitted as a complete test sequence without the need
for additional communication between the device under test
and the tester during the test procedure.
In the invented method for calibrating a receiver path of a
mobile communication device, a communication tester comprises
a test mode for transmitting bursted test signals. These test
signals are transmitted by the communication tester using a
time division multiplexing transmission method. The device
under test is provided and connected to the communication
tester via a communication line. The invented method also
comprises the step of exchanging a plurality of test parame-
ters between the DUT and the communication tester via the
communication line. The device under test is set into a test
mode and a test sequence is started. The test sequence in-
cludes a plurality of test signals predetremined by the ex-
changed test parameters. The test signals are transmitted by
the communication tester and received by the device under
test. Finally, calibration parameters are calculated and
stored in the communication device for calibrating and opti-
mizing the receiver path during normal operation of the de-
vice .
In order to calibrate a receiver path of a communication de-
vice a plurality of test parameters are sent between DUT and
communication tester before the test signals are transmitted.
The communication device as well as the communication tester
will follow those specifications determined by the test pa-
rameters . The test signals can be transmitted and received as
a complete test sequence without stopping the sequence and
communicating additional test parameters again.
It is preferable that the test signals are transmitted using
a time division multiplexing transmission method according to
the GSM mobile communication standard. Then test signals with
a defined set of parameters are transmitted or received in
each timeslot. In this embodiment of the invention the cali-
bration procedure for the transmitter path of a wireless com-
munication device uses the timeslots according to the GSM mo-
bile communication standard when transmitting a test signal.
Preferably test signals with different, but well determined
RF parameters are transmitted in each timeslot specified by
the GSM mobile communication standard. Other mobile communi-
cation standards a using time division multiplexing access
method can be used as well. For example, the time slot struc-
ture of the Bluetooth or the 802.11 WLAN standard, can be
used. The determined RF-parameter set forth by test parame-
ters previously sent are preferable the power level and the
signals' frequency.
In an embodiment of the invented method the step of communi-
cating the plurality of test parameters comprises the steps
of selecting at least one frequency in which the test signals
have to be transmitted. Then a plurality of power levels for
each selected frequency is also selected. The communication
tester as well as a device under test use the same frequen-
cies and same power levels determined by the plurality of
test parameters. Hence additional communication or exchange
of settings between the communication tester and the device
under test is not necessary between the steps of transmitting
or receiving the test sequence.
In a preferred embodiment of the invention the mobile device
and the communication tester are connected by RS232 communi-
cation terminal to each other. Of course other communication
lines like I2C bus or similar communication terminals can be
used as well. In a preferred embodiment of the invention, it
is the mobile device, which selects the frequency as well as
different power levels for the transmitter path or the re-
ceiver path calibration procedure. It communicates the se-
lected frequencies and power levels to the communication
tester via the communication line.
In a further embodiment of the invention the mobile communi-
cation device comprises a non-signaling test mode of opera-
tion. In. this non-signaling test mode the communication de-
vice transmits signals with data content different from the
GSM mobile communication standard. Preferably test signals
are used in the non-signaling mode, whose data content are
optimized for the test or the calibration procedure to be
performed. In an embodiment of this invention the data con-
tent of the signal is communicated between the communication
tester and the DUT for a later calculation of the calibration
parameters. Using a special non-signaling test mode will fas-
ten the overall calibration procedure.
In another embodiment of the invention the device under test
calculates the calibration parameters and stores the calcu-
lated calibration parameters in a memory within the mobile
communication device. The embodiment is advantageous for re-
ceiver tests, because the measured parameters must not be
sent back to the communication tester for csilculating the
calibration parameters. This will enhance the efficiency of
the calibration procedure. In another embodiment measured
signal parameters will be averaged to get smoother results
and decrease any noise on the received signal.
A test system according to the invention comprises at least
one mobile communication device to be tested. The actual de-
vice to be tested is called device under test or DUT in short
form. The at least one communication device comprises a
transmitter path and a receiver path. Furthermore it com-
prises a test operation mode. The transmitter path of the at
least one communication device is designed to transmit sig-
nals according to a time division multiplexing transmission
standard. It is therefore capable of transmitting bursted
signals. The receiver path is designed to receive bursted
signals. Preferably the communication device is designed to
transmit and receive signals according to the GSM mobile com-
munication standard. The test system comprises a communica-
tion tester, coupled to the device under test. The communica-
tion tester comprises a signal generator as well as a signal
receiver. The signal generator and the signal receiver are
designed to transmit or receiver bursted signals according to
a time division multiplexing method. Preferably the communi-
cation tester comprises means for generating and transmitting
signals and receiving signals according to the GSM mobile
communication standard. The device under test and the commu-
nication tester are connected in a way to communicate and ex-
change a plurality of test parameters for a test sequence be-
fore starting the test sequence and the calibration proce-
dure .
In a preferred embodiment the plurality of test parameters
include power levels and frequency for the signal to be
transmitted.
Preferably the signal generator is adopted to output a spe-
cial predefined frame sequence starting with a synchroniza-
tion burst according to the GSM communication standard to al-
low the device under test to synchronize itself with the
burst during the test sequence of a receiver path.
In another embodiment of the invention the test system com-
prises a switching unit to connect a plurality of mobile com-
munication devices to the communication tester. The switching
unit can be controlled by the communication tester.
In the following the invention will be explained in greater
detail by the accompanying figures showing various embodi-
ments of the invention. The figures are simplified schematic
representations presented for illustration purposes only and
do not limit the invention.
Figure 1 shows a test system according to a first embodiment
of the invention.
Figure 2 shows a test system according to a second embodiment
of the invention.
Figure 3 shows a time power diagram used for the calibration
procedure of the transmitter path.
Figure 4 shows an embodiment of the calibration procedure for
the receiver path.
Figure 1 shows a test system according to the invention. Such
a test system is used after production of the mobile communi-
cation device to test the functionality of the mobile commu-
nication device and perform the necessary calibration tests.
During such test procedures different RF parameters of the
transmitter path and the receiver path of the communication
device are measured, and calibration parameters are calcu-
lated out of the measurement results.
The calibration parameters are then stored in a memory within
the mobile communication device in order to calibrate and op-
timize the transmitter or receiver path during normal opera-
tion. The RF-parameters used are, for example power level and
frequency. For example, while using different power levels
and frequencies for the signal to be transmitted the linear-
ity of the main amplifier in the transmitter path can be
tested. Any deviation in the linearity of the amplifier is
measured, and calibration parameters are calculated and
stored in the mobile communication device to compensate any
non-linearity of the transmitter path. Tests, which measure
the frequency of received signals are also used for transmit-
ter tests, the receiver test and for the VCO in the receiver
path to optimize the demodulation procedure of a received
signal during normal operation.
The test system 1 comprises a communication tester unit 2 as
well as a mobile communication device 3 to be tested. The
tester unit 2 comprises a general purpose signal generator 21
capable of generating signals according to the GSM mobile
communication standard. Other kinds of signals can also be
generated. All signals generated by the signal generator 21
fulfil the RF and data content specification set by the GSM
communication standard. The signal generator 21 is connected
to the signal generator output terminal 25. The signal gen-
erator 21 is controlled by the control unit 23.
The control unit 23 is connected to the signal generator 21
and transmits all necessary parameters for signal generation
to the generator 21. The control unit 23 is also connected to
an input/output-(I/O)-terminal 24. Additionally, the communi-
cation tester 2 comprises a receiver 22. The receiver 22 is
also connected to an terminal 25 for receiving RF signals,
demodulating the received RF and measuring RF parameters.
Thus the terminal 25 is adopted for transmitting and receiv-
ing signals. Besides measuring different RF parameters the
receiver 22 is capable of demodulating a received signal ac-
cording to a modulation type specified by a communication
standard and analyzing the demodulated data content. The re-
ceiver 22 is also controlled by the control unit 23.
The mobile communication device 3 or the device under test,
comprises a I/O terminal 31 which is connected to the commu-
nication I/O terminal 24 of the communication tester 2. It
further comprises a terminal 33 representing transmitter out-
put 33 and a receiver input 32. For example terminal 33 is an
antenna or an antenna connection. The terminal 33 is con-
nected to the terminal 25 of the communication tester 2. The
transmitter output 33 is also connected to a transmitter path
34. The transmitter path 34 is adopted to generate signals
according to at least the GSM mobile communication standard
and to send them to the terminal 33 for transmitting. The mo-
bile 3 also comprises a receiver path 35 connected to the
terminal 32.
The receiver path 35 is capable of measuring different RF pa-
rameter of a received signal, for example its power level and
its frequency. Furthermore the receiver path is designed to
demodulate the received signal for further signal processing.
The receiver and transmitter paths are controlled by a con-
trol unit 36. The control unit 36 is also connected to the
communication I/O terminal 31.
The device under test 3 comprises at least two different
modes of operation. In a normal operation mode, the device 3
transmits and receives signals according to the GSM mobile
communication standard. Additionally the DUT can be adopted
to receive and transmit signals according to the communica-
tion standards WCDMA, Edge, Bluetooth and WLAN and the like.
However the mobile must transmit and receive bursted signals.
In a second operation mode the mobile device receives or
transmits signals for test purposes only. This operation mode
is called test mode.

Some functionality tests to be performed by the mobile device
acquire signal generation according to the GSM communication
standard. This is called signaling mode. This mode is used
for functionality tests, which include, for example identify-
ing a base station, sending the correct identification signal
or synchronization onto a base station. Other tests mainly
for signal quality do not acquire a signaling test mode, but
need nevertheless determined and well-defined data content.
Such a mode is called non-signaling mode. The signal genera-
tor 21 of communication tester unit 2 and the transmitter
path of the mobile communication device to be tested is capa-
ble of generating signals according to a signaling mode as
well as to the non-signaling mode. The receiver 22 of the
communication tester and the receiver path of the mobile de-
vice are designed to measure different RF-parameters and de-
modulate signals in the signaling and non-signaling test
modes.
Before the transmitter test routine can be started, mobile 3
and communication tester 2 will communicate and exchange data
over the communication line between the terminals 31 and 24.
The DUT 3 sends different frequency values for which the test
signals are going to be transmitted. Furthermore for each
frequency a respective signal with six different power levels
shall be transmitted. These power levels are also send to the
communication, tester 2 over the communication line.
For example the mobile 3 sends a list of four frequencies in-
cluding the low GSM 850 channel, the low midband GSM 850
channel, the high midband GSM 850 channel and the high band
GSM 850 channel. For each of those frequencies eight differ-
ent power levels are preselected and send to the communica-
tion tester. The power level and the frequencies for the GSM
900, the GSM 1800 and the GSM 1900 band are also sent. In to-
tal 16 different frequencies with 8 power levels for each of

the frequencies are sent to the communication tester 2 by the
DUT 3. Those the plurality of the test signals to be trans-
mitted according to the paramters is called test sequence for
the transmitter path.
The control unit 23 of communication tester 2 receives the
parameters indicating the frequencies and power levels for
the test signals and stores them in an internal memory. Then
it switches its receiver 22 to the first frequency and pre-
pares for the test procedure. Therafter the test sequence is
started. The transmitter path of the DUT will now transmit a
first signal with the power levels and the frequencies ac-
cording to the settings and sends them over terminal 32 to
the receiver 22 of the communication tester 2. Each power
level will be transmitted in a timeslot of a GSM frame ac-
cording to the GSM standard.
A diagram of transmission power versus time is shown in fig-
ure 3. As it can be seen a GSM-frame consists of eight time-
slots TSO to TS7 each approximately 560/Lts. 3!n each timeslot a
signal with a different power level PLO to PL6 is transmitted
by the DUT. In this embodiment the power levels are decreas-
ing compared to a previous timeslot of the GSM-frame, but
other power levels can be selected. During the eightth time-
slot TS7 the signal is blanked out by the DUT. The gap is
used to change the first frequency to a second frequency. The
second frequency is determined by the control unit of the DUT
and corresponds to the second frequency exchanged with the
communication tester before the test. The time span for the
frequency change is one timeslot according to the GSM stan-
dard. During the same time the receiver in the communication
device also changes its internal settings and prepares for
receiving a test signal at the second frequency.

At the beginning of the second GSM-frame the DUT is settled
to the new frequency and restarts transmitting test signals
with different power levels in each timeslot of the second
GSM frame. All signals are sent via terminal 32 to the commu-
nication tester. The terminal 32 is considered as the RF-
terminal of transmitting and receiving signals. In the
eightth timeslot of the second GSM frame it blanks out the
signal and changes frequency again. This process is repeated
with different frequencies until it is stopped. During trans-
mission time the communication tester unit 2 records all
measured power levels. Due to the transmission gap in the
seventh timeslot of each GSM frame the communication tester 2
can synchronize itself for more accurate power measurements.
After recording and averaging the measured power levels, the
communication tester 2 will calculate calibration values out
of the measured results and the reference power levels trans-
mitted before by the DUT over the communication line. The
calibration values are fed back to the DUT and stored in a
memory for calibration and optimizing the transmission path
during normal operation.
For the receiver test of the DUT the signal generator 21 of
the communication tester unit 2 is set to the non-signaling
mode. The signal generator 21 will be programmed to output a
special predetermined sequence using the GSM timeslot struc-
ture. According to the GSM standard a GSM-frame consists of
eight timeslots TSO to TS7. A diagram with frequencies and
power levels of the test sequence is shown in figure 4. The
test sequence starts with a synchronization burst at the fre-
quency fl with the same power level and determined data con-
tent on each timeslot. This will allow the receiver path of
the DUT to synchronize itself to the transmitted signal.

In the eightth timeslot TS7 of the first GSM frame the commu-
nication tester will change ist output frequency to the new
frequency f2. Simultanously the receiver path prepares for
receiving a signal on the frequency f2. At the beginning of
the second GSM frame the communication tester 2 sends differ-
ent power level PLO to PL6 in the time slots TSO to TS6. The
test is repeated until it is stopped.
The parameters for the frequencies fl to fn as well as the
power levels PLO to PL6 to be transmitted are exchanged be-
tween the DUT and the communication tester 2 before the test
sequence is started. Therefore it is not necessary to stop
the test sequence between different GSM-frames for communi-
cating additional data. The power levels measured by the DUT
are stored in a memory within the DUT. After the test is fin-
ished stored power levels are fed back to the communication
test unit for calculating the calibration parameters.
The calibration procedure for the local oscillators of the
DUT can be performed in a similar way. After exchanging all
necessary parameters between the DUT and the communication
tester, the DUT starts transmitting a burst at a defined GSM
frequency and within a timeslot. Then it changes the fre-
quency to the next channel and starts transmitting a burst
again. Preferably the burst is transmitted longer than one
timeslot to allow automatic synchronization. The communica-
tion tester measures the difference between the frequency of
the transmitted signal and the frequency predetermined previ-
ous to the test. Based on the measured frequency error, the
slope and frequency offsets can be calculated. The calculated
values are stored in the memory of the DUT for compensating
slope and frequency error.
By transmitting all necessary parameters to perform the
transmitter or receiver test before starting the test, the

time span for transmitting the signals and measuring the re-
ceived signals can be significantly reduced. It is therefore
not necessary to stop the test and exchange parameters for
the next signals to be transmitted or received. Transmitting
a synchronization burst at the beginning of the test sequence
allows an automatic synchronization. The invented method is
not restricted to mobile phones for the GSM communication
standard. It can be used with every device comprising a time
division transmission or receiving mode.
Figure 2 shows an example of a test system having a communi-
cation tester 2 and a plurality of communication devices 3,
3A and 3B. The communication devices are connected to a board
4, which is controlled by the control unit 23 of the communi-
cation tester 2. The board is adopted as a switching board
and is connected to a plurality of mobile phones to be
tested. Depending on a control signal the switching board 4
connects one device under test to the communication tester 2.
Again the RF-connector 32 of each DUT is connected to an I/O
terminal 33 of the switching board. The DUTs 3, 3A and 3B in-
clude circuits 36A and 37 for calculating and storing cali-
bration parameters. Using a switching board will signifi-
cantly reduce the time for the test procedures, because a DUT
can be tested, while a second DUT calculates its calibration
parameters out of the results of a previous measurement.
WE CLAIMS
1. A method for calibrating a transmitter path (34) of a
communication device (3)* the transmitter path (34) capable of
transmitting bursted signals, the method comprising the steps
of;
- providing and preparing a communication tester (2)
comprising a test mode for measuring parameter of a received
signal;
— providing the communication device (3) ;
- connecting the communication device (3) to the
omraunication tester (2) over a communication line (L)»
- communicating a plurality of sets of test parameters
between the communication device (3) and the
communication tester (2) through the communication line
(1);
— setting the communication device (3) into a test mode;
transmitting a plurality of bursted test signals by the
communication device (3)* each bursted test signal
determined by a set of test parameters;
— receiving the plurality of transmitted test signals by
the communication tester (2);
— calculating calibration parameters and storing the
calculated parameters in the communication device (3)
for optimizing the transmitter path (34).
2. Method for calibrating a receiver path (35) of a
communication device (3), the method comprising the steps of:
— providing and preparing a communication tester (2)
comprising a test mode for transmitted bursted signals*
providing the communication device (3);
— connecting the communication device (3) and the
communication tester (2) over a communication line (L);
— communicating a plurality of sets of test parameters
between the communication device (3) and the
communication tester (2) through the communication line
(L);
— setting the communication — trasnmitting a plurality of bursted test signls each
bursted test signals according to one of the plurality
of test parameters by the communication tester (2);
— receiving the plurality of transmitting test signals
by the communication device (3)*
— calculating calibration parameters and storing the
calculated parameters in the communication device (3>
for optimizing the receiver path (35)-
'S, Method as claimed in claim 1 or 2* wherein the bursted
signals art? transmitted according to a time slot structure of the
BSH mob i \ e commurticat!on standard.
4. Method as claimed in one of the claims i to 3, wherein
communicating test parameter comprises the step of:
— selecting at least one frequency on which the test
signals s.re transmitted!
— selecting a plurality of power levels for each selected
frequency.
5. Method as claimed in one of the claims 1 to 4, wherein
communicating test parameters comprises the steps of :
— sending a plurality of test parameter sets to the
communication tester (2) by the communication device*
each set comprising a frequency and at least one power
level of the test signal.
6. Method as claimed in one of the claims 1 to 5» wherein
transmitting a plurality of bursted test signals comprises the
steps of*
— transmitting a synchronization burst with the a pre-
defined data content» frequency and power level.
7. Method as claimed in one of the claims 1 to 6» wherein
transmitting a plurality of bursted test signals comprises the
steps oft
— repeating the transmission of the plurality of bursted
test signals until stopped.
B, Method as claimed in one of the claims 1 to /» wherein
transmitting a plurality of bursted t»«£ signals comprinttm fcht
steps of*
— setting a. first frequency (f2> determined by the test
parameters*
— setting a first power level determined by the
test parametersi
— transmitting a first bursted test signal with the first-
frequency (f'2) and a first power level (PLO>»
— setting at least one second power level (PL1>
determined by the test parameters and transmitting an
at least one second bursted signal with the first
frequency (f2> and the at least one second power level
(PL1M
— blanking the signal and setting a second frequency (f2>
determined by the test parameters.
V. Method as claimed in one of the claims i to 8, wherein
receiving the transmitted test signals comprises the steps of :
— measuring a signal parameter of the received signal;
— averaging the signal parameter.
ID. Method as claimed in one fo the claims 1 to V, wherein
receiving the transmitted test signals comprises the steps of:
— storing signal parameters of the received test signals
in a memory.
11. Method as claimed in one of the claims 2 to ID* wherein
calculating calibration parameters comprises the steps of "¦
— sending a termination signal for stopping the trans-
mission of the test signals through the communication
1 inmi
— sending signal parameters of a received signal back to
the communication tester through the communication
1 inei
— comparing the signal parameters sent through the
communication line with test parameters.
12. Test system for calibrating a communication device?
romp r i s i ng *
— at least one communication device (3) to be tested, said
communication device (3) comprising a transmitter
path (34) and a receiver path (3b), further adopted for a
test operation mode and a normal operation mode, the normal
operation mode adopted for transmitting and receiving
bursted signals,
— a communication tester (2), comprising a signal
generator (21) and designated to transmit and receive
bursted test signals;
— wherein the communication device and the communication
tester (2) comprises means for communicating a
plurality of test parameters for bursted test signals
in the test operation mode before the test procedure
is started, wherein the at least one communication
device (3) and the communication tester (3) is adopted
for using bursted signals in the test operation mode.
13. Test system as claimed in claim 12, wherein the at
least one communicaton device (3) and the communication tester
(3) is adopted for using the time slat structure of the GSM
communication standard in the test operation mode.



The invention relates to calibrating a transmitter or a receiver path of a communication device (3) a communication tester (2) is provided and connected to the communication device (3), The communication device (3) and the communication tester (2) are capable of transmitting and receiving bursted signals. Test parameters for a test sequence for calibrating the transmitter path (34) or receiver path (35) of the communication device (3) are interchanged and both devices are set into a test mode. Then the test sequence is started and test signals are transmitted and received without additional exchange of test parameters, RF parameters of the test signals are measured and used for calibration.

Documents:

260-KOL-2005-(06-03-2012)-ASSIGNMENT.pdf

260-KOL-2005-(06-03-2012)-CORRESPONDENCE.pdf

260-KOL-2005-(06-03-2012)-FORM-16-1.pdf

260-KOL-2005-(06-03-2012)-FORM-16.pdf

260-KOL-2005-(06-03-2012)-PA-CERTIFIED COPIES.pdf

260-KOL-2005-(16-10-2012)-CORRESPONDENCE.pdf

260-kol-2005-abandoned letter.pdf

260-kol-2005-abstract.pdf

260-KOL-2005-CLAIMS 1.1.pdf

260-kol-2005-claims.pdf

260-kol-2005-correspondence.pdf

260-kol-2005-correspondence1.1.pdf

260-KOL-2005-DESCRIPTION (COMPLETE) 1.1.pdf

260-kol-2005-description (complete).pdf

260-kol-2005-examination report.pdf

260-kol-2005-examination report1.1.pdf

260-kol-2005-form 1.pdf

260-kol-2005-form 18.1.pdf

260-kol-2005-form 18.pdf

260-kol-2005-form 2.pdf

260-kol-2005-form 26.1.pdf

260-kol-2005-form 26.pdf

260-KOL-2005-FORM 27.pdf

260-kol-2005-form 3.1.pdf

260-kol-2005-form 3.pdf

260-kol-2005-form 5.1.pdf

260-kol-2005-form 5.pdf

260-kol-2005-gpa.pdf

260-kol-2005-gpa1.1.pdf

260-kol-2005-granted-abstract.pdf

260-kol-2005-granted-claims.pdf

260-kol-2005-granted-description (complete).pdf

260-kol-2005-granted-drawings.pdf

260-kol-2005-granted-form 1.pdf

260-kol-2005-granted-form 2.pdf

260-kol-2005-granted-specification.pdf

260-KOL-2005-PETITION UNDER RULE 137.pdf

260-kol-2005-priority document.pdf

260-KOL-2005-REPLY TO EXAMINATION REPORT 1.1.pdf

260-kol-2005-reply to examination report.pdf

260-kol-2005-reply to examination report1.1.pdf

260-kol-2005-specification.pdf

260-kol-2005-translated copy of priority document.pdf


Patent Number 242631
Indian Patent Application Number 260/KOL/2005
PG Journal Number 36/2010
Publication Date 03-Sep-2010
Grant Date 02-Sep-2010
Date of Filing 31-Mar-2005
Name of Patentee INFINEON TECHNOLOGIES AG
Applicant Address ST MARTIN-STR. 53, 81669 MUNCHEN
Inventors:
# Inventor's Name Inventor's Address
1 SOREN FISKER FILIPPAVEJ 49, AALBORG
2 JORN TOFTGAARD LYNGTOFTEN, 23, 9260 GISTRUP
3 PETER BUNDGAARD BEJSEBAKKEVEJ 11, 9000 AALBORG
4 POUL GUNDERSEN IDASMINDE 24, 8900 RANDERS
PCT International Classification Number H04B 17/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 04008013.7 2004-04-01 EUROPEAN UNION