Title of Invention

MOBILE COMMUNICATION TERMINAL AND SIGNAL RECEIVING METHOD THEREOF

Abstract A mobile communication terminal and signal receiving method thereof are disclosed, by which GPS and DMB signals can be received using a dual band antenna. The present invention includes a CDMA-mobile broadcast dual band antenna receiving a CDMA or mobile broadcast signal, a mobile broadcast-GPS dual band antenna receiving a mobile broadcast of GPS signal, a first means for diverging the CDMA or mobile broadcast signal received by the CDMA-mobile broadcast dual band antenna, a second means for diverging the mobile broadcast or GPS signal received by the mobile broadcast-GPS dual band antenna, and a third means for selecting either the mobile broadcast signal outputted from the first means or the mobile broadcast signal outputted from the second means if the selected mobile broadcast signal has a signal quality better than that of the non-selected mobile broadcast signal.
Full Text MOBILE COMMUNICATION TERMINAL AND
SIGNAL RECEIVING METHOD THEREOF
[001] This application claims the benefit of the Korean Patent Application
No. 10-2004-0096334, filed on November 23, 2004, which is hereby
incorporated by reference as if fully set forth herein.
BACKGROUND OF THE INVENTION
Field of the Invention
[002] The present invention relates to a mobile communication terminal, and
more particularly, to a mobile communication terminal and signal
receiving method thereof. Although the present invention is suitable
for a wide scope of applications, it is particularly suitable for receiving
GPS and mobile broadcast signals by preventing interference between
radio signals received via a dual band antenna.
Discussion of the Related Art
[003] Generally, as standards for mobile broadcasting, there are FLO
(forward link only) by Qualcomm, U.S.A., DVB-H (digital video
broadcasting-handheld) by Nokia, Europe, and Korean DMB (digital
multimedia broadcasting) based on European digital audio
broadcasting (DAB). DMB is selected to be explained in the following
description. As used herein, the term DMB does not limit the scope of
the claims to the Korean standard. Rather, the term DMB is used as a
generic indicator of a variety of multimedia services that include both
audio data and video data, such as, but not limited to, those services
represented by the standards identified above.
[004] DMB describes a broadcasting service that enables appreciation of
high quality video and CD-level music at anytime or anywhere. DMB
is merging with a current mobile communication technology such that
DMB service will be available via a mobile communication terminal.
[005] FIG. 1 is a block diagram of a mobile communication terminal to
receive CDMA and DMB signals according to a related art.
[006] Referring to FIG. 1, a mobile communication terminal according to a
related art consists of a CDMA-DMB dual band antenna 11 and a
DMB antenna 12 to provide CDMA communications and DMB
services.
[007] Signals received via the CDMA-DMB dual antenna 11 are selectively
switched by a diplexer 13 according to mode selection control signals,
respectively. Hence, a CDMA signal is inputted to a radio frequency
receiver (RFR) chipset 17 via a CDMA RF path 14, whereas a DMB
signal is inputted to a DMB chipset 18 via a first DMB RF path 15.
Meanwhile, a DMB signal received via the DMB antenna 12 is
inputted into the DMB chipset 18 via a second DMB RF path 16. The
DMB chipset 18 selects, based on the path having the better radio
sensitivity, which of the two DMB signals is to be used.
[008] Meanwhile, in order for the mobile communication terminal to use a
function of GPS (global positioning system) as well as to receive the
DMB, the CDMA-DMB dual band antenna 11 is replaced by a
CDMA-DMB-GPS triple band antenna to perform triple switching
using an SP3T (single pole three-throw) switch and the like or a GPS
antenna is independently provided to use.
[009] However, in using the triple band antenna, a primary interference
signal between a 1.57GHz GPS signal and an 824~896MHs CDMA
signal lies on 2.39~2.47GHz to affect a 2.6GHz DMB satellite signal.
And, a primary interference signal between the CDMA and DMB
satellite signals lies on 1.78~1.70GHz to affect the 1.57GHz GPS
signal.
[0010] Moreover, in case of using the GPS antenna independently, the three
antennas coexisting in one mobile communication terminal mutually
play a role as dipole intervening with each other in radio sensitivity to
degrade the radio sensitivity or reception.
SUMMARY OF THE INVENTION
[0011] Accordingly, the present invention is directed to a mobile
communication terminal and signal receiving method thereof that
substantially obviates one or more problems due to limitations and
disadvantages of the related art.
[0012] An object of the present invention is to provide a mobile
communication terminal and signal receiving method thereof, by
which GPS and DMB signals can be received using a dual band
antenna.
[0013] Additional advantages, objects, and features of the invention will be
set forth in part in the description which follows and in part will
become apparent to those having ordinary skill in the art upon
examination of the following or may be learned from practice of the
invention. The objectives and other advantages of the invention may
be realized and attained by the structure particularly pointed out in the
written description and claims hereof as well as the appended
drawings.
[0014] To achieve these objects and other advantages and in accordance with
the purpose of the invention, as embodied and broadly described
herein, a mobile communication terminal according to the present
invention includes a first reception path establishing unit to receive a
CDMA or mobile broadcast signal, a second reception path
establishing unit to receive a DMB or GPS (global positioning system)
signal, a mobile broadcast chipset receiving the mobile broadcast
signal delivered via the first or second reception path establishing unit,
and a radio frequency reception (RFR) chipset receiving the CDMA
and/or GPS signal delivered via the first or second reception path
establishing unit.
[0015] Preferably, the first reception path establishing unit includes a CDMA-
mobile broadcast dual band antenna receiving the CDMA or mobile
broadcast signal and a first diplexer selecting the CDMA or mobile
broadcast signal received via the CDMA-mobile broadcast dual band
antenna according to the mode selection control signal. And, the
second reception path establishing unit includes a mobile broadcast-
GPS dual band antenna receiving the mobile broadcast or GPS signal
and a second diplexer selecting the mobile broadcast or GPS signal
received via the mobile broadcast-GPS dual band antenna according to
the mode selection control signal.
[0016] More preferably, the mobile communication terminal further includes
a band-pass filter (BPF) passing the GPS signal selected by the second
diplexer.
[0017] In another aspect of the present invention, a mobile communication
terminal includes a CDMA-mobile broadcast dual band antenna
receiving a CDMA or mobile broadcast signal, a mobile broadcast-
GPS dual band antenna receiving a mobile broadcast of GPS signal, a
first means for diverging the CDMA or mobile broadcast signal
received by the CDMA-mobile broadcast dual band antenna, a second
means for diverging the mobile broadcast or GPS signal received by
the mobile broadcast-GPS dual band antenna, and a third means for
selecting either the mobile broadcast signal outputted from the first
means or the mobile broadcast signal outputted from the second means
if the selected mobile broadcast signal has a signal quality better than
that of the non-selected mobile broadcast signal.
[0018] Preferably, the mobile communication terminal further includes a band
pas filter (BPF) band-passing the GPS signal outputted from the
second means.
[0019] Preferably, the first means diverges the CDMA or mobile broadcast
signal according to an inputted mode selection control signal. And, the
second means diverges the mobile broadcast or GPS signal according
to an inputted mode selection control signal.
[0020] Preferably, the first means includes a diplexer. And, the second means
comprises a diplexer.
[0021] Preferably, the mobile broadcast is a digital multimedia broadcasting
(DMB).
[0022] In another aspect of the present invention, a method of signal reception
in a mobile communication terminal includes the steps of diverging a
CDMA or mobile broadcast signal from a signal received via a
CDMA-mobile broadcast dual band antenna, diverging a mobile
broadcast or GPS signal from a signal received via a mobile broadcast-
GPS dual band antenna, comparing qualities of the mobile broadcast
signals received by the two diverging steps, and selecting the mobile
broadcast signal having the better quality of reception.
[0023] Preferably, the two diverging steps are carried out by a diplexer
selectively establishing a reception path according to a mode selection
control signal.
[0024] It is to be understood that both the foregoing general description and
the following detailed description of the present invention are
exemplary and explanatory and are intended to provide further
explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS :
[0025] The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a
part of this application, illustrate embodiment(s) of the invention and
together with the description serve to explain the principle of the
invention. In the drawings:
[0026] FIG. 1 is a block diagram of a mobile communication terminal
according to a related art; and
[0027] FIG. 2 is a block diagram of a mobile communication terminal
according to one preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0028] Reference will now be made in detail to the preferred embodiments of
the present invention, examples of which are illustrated in the
accompanying drawings. Wherever possible, the same reference
numbers will be used throughout the drawings to refer to the same or
like parts.
[0029] FIG. 2 is a block diagram of a mobile communication terminal
according to one preferred embodiment of the present invention.
[0030] Referring to FIG. 2, a mobile communication terminal according to
one preferred embodiment of the present invention includes a CDMA-
DMB dual band antenna 21 receiving a CDMA or DMB signal, a
DMB-GPS dual band antenna 22 receiving a DMB or GPS signal, a
first diplexer 23 diverging the CDMA or DMB signal received by the
CDMA-DMB dual band antenna 23, a second diplexer 24 diverging
the DMB or GPS signal received by the DMB-GPS dual band antenna
22, a DMB chipset 29 selecting a signal having a better quality from
the DMB signals respectively outputted from the first and second
diplexers 23 and 24 to perform data processing on the selected signal,
a radio reception chipset 30 converting the CDMA signal signal-
processed via an RF path from the first diplexer 23 and the GPS signal
[0031] signal-processed via an RF path from the second diplexer 24 to
baseband signals, and a GPS band-pass filter 28 band-passing the GPS
signal outputted from the second diplexer 24. In this case, the RFR
chipset by Qualcomm can be used as the radio reception chipset 30.
[0032] A CDMA RF path 25 is a path for the CDMA signal outputted from
the first diplexer 23 to be delivered to the radio reception chipset 30. A
first DMB RF path 26 is a path for the DMB signal outputted from the
first diplexer 23 to be delivered to the DMB chipset 29. A second
DMB RF path 27 is a path for the DMB signal outputted from the
second diplexer 24 to be delivered to the DMB chipset 29.
[0033] An MSM 32 is a processor chip that drives various functions and
applications including a short message service support, various
multimedia support, Internet function and the like as well as a basic
function of voice communication.
[0034] And, the CDMA RF path 25, the first DMB RF path 26 and the second
DMB RF path 27 can employ the related art.
[0035] An operation of one preferred embodiment of the present invention
shown in FIG. 2 is explained as follows.
[0036] First of all, the signal received via the CDMA-DMB dual band
antenna 21 is separated into the CDMA or DMB signal according to a
mode selection control signal by the first diplexer 23. The CDMA
signal outputted from the first diplexer 23 is signal-processed via the
CDMA RF path 25 to be inputted to the radio reception chipset 30.
And, the DMB signal outputted from the first diplexer 23 is signal-
processed via the first DMB RF path 26 to be inputted to the DMB
chipset 29.
[0037] The signal received via the DMB-GPS dual band antenna 22 is
separated into the DMB or GPS signal according to a mode selection
control signal by the second diplexer 24. The DMB signal outputted
from the second diplexer 24 is signal-processed via the DMB RF path
27 to be inputted to the DMB chipset 29. And, the GPS signal
outputted from the second diplexer 24 is band-passed by the GPS
band-pass filter 28 to be inputted to the radio reception chipset 30.
[0038] The radio reception chipset 30 converts the inputted CDMA and GPS
signals to baseband signals to deliver to the MSM 32. The RFR
chipset can be used as the radio reception chipset 30. In this case, the
RFR chipset mixes the CDMA or GPS signal as an RF signal with a
local signal outputted from a voltage controlled oscillator (VCO) (not
shown) built into the chip to convert to the baseband.
[0039] The DMB chipset 20 selects the signal having the better signal quality
from the DMB signals respectively inputted via the first and second
DMB RF paths 26 and 27, then converts the selected signal to a
baseband signal, and then delivers the converted signal to the MSM
32.
[0040] The MSM 32 receives the CDMA, DMB and GPS signals respectively
converted to the baseband signals and then performs data processing
on the received signals. Hence, the data-processed signals can be used
by the application program of the mobile communication terminal.
[0041] Accordingly, the present invention provides the following effects or
advantages.
[0042] First of all, by avoiding the triple band antenna enabling the
interference according to the frequency deviation between the CDMA,
GPS and DMB bands, the present invention prevents the interference
on the radio signals received via antenna.
[0043] Secondly, by configuring the antenna additionally provided for the
DMB reception with the dual band antenna enabling the reception of
the GPS signal and by adjusting each of the diplexers according to the
mode selection control signal to select the signals received by both
antennas, the present invention enables the interference-free radio
signal reception, whereby the mobile communication terminal can
enable the high-quality receptions of the DMB and GPS services.
[0044] It will be apparent to those skilled in the art that various modifications
and variations can be made in the present invention without departing
from the spirit or scope of the inventions. Thus, it is intended that the
present invention covers the modifications and variations of this
invention provided they come within the scope of the appended claims
and their equivalents.
WE CLAIM :
1. A mobile communication terminal comprising:
a first reception path establishing unit to receive a CDMA or mobile
broadcast signal;
a second reception path establishing unit to receive a mobile broadcast
or GPS (global positioning system) signal;
a controller configured to compare a quality of a first diverged mobile
broadcast signal from the signal received via the first reception path and a
quality of a second diverged mobile broadcast signal from the signal received
via the second reception path and to select the mobile broadcast signal
according to the comparing result;
a mobile broadcast chipset receiving the mobile broadcast signal
delivered via the first or second reception path establishing unit; and
a radio frequency reception (RFR) chipset receiving the CDMA and/or
GPS signal delivered via the first or second reception path establishing unit,
wherein a reception path is selectively established according to a mode
selection control signal.
2 The mobile communication terminal as claimed in claim 1, wherein the
first reception path establishing unit comprises a CDMA-mobile broadcast dual
band antenna receiving the CDMA or mobile broadcast signal and a first
diplexer selecting the CDMA or mobile broadcast signal received via the CDMA-
mobile broadcast dual band antenna according to the mode selection control
signal and wherein the second reception path establishing unit comprises a
mobile broadcast-GPS dual band antenna receiving the mobile broadcast or
GPS signal and a second diplexer selecting the mobile broadcast or GPS signal
received via the mobile broadcast-GPS dual band antenna according to the
mode selection control signal.
3. The mobile communication terminal as claimed in claim 2, comprising a
band-pass filter (BPF) passing the GPS signal selected by the second diplexer.
4. The mobile communication terminal as claimed in claim 1, wherein the
mobile broadcast signal is a digital multimedia broadcasting (DMB) signal.
5. A signal receiving method in a mobile communication terminal,
comprising the steps of:
diverging a CDMA or mobile broadcast signal from a signal received via
a CDMA-mobile broadcast dual band antenna;
diverging a mobile broadcast or GPS signal from a signal received via a
mobile broadcast-GPS dual band antenna;
comparing a quality of a first diverged mobile broadcast signal from the
signal received via the CDMA-mobile broadcast dual band antenna and a
quality of a second diverged mobile broadcast signal from the signal received
via the mobile broadcast-GPS dual band antenna; and
selecting the mobile broadcast signal having the better quality of
reception in response to the comparing result,
wherein the two diverging steps are carried out by a diplexer selectively
establishing a reception path according to a mode selection control signal.
6. The method of claim 5, wherein the mobile broadcast signal is a digital
multimedia broadcasting (DMB) signal.


A mobile communication terminal and signal receiving method thereof are
disclosed, by which GPS and DMB signals can be received using a dual band antenna.
The present invention includes a CDMA-mobile broadcast dual band antenna
receiving a CDMA or mobile broadcast signal, a mobile broadcast-GPS dual band
antenna receiving a mobile broadcast of GPS signal, a first means for diverging the
CDMA or mobile broadcast signal received by the CDMA-mobile broadcast dual
band antenna, a second means for diverging the mobile broadcast or GPS signal
received by the mobile broadcast-GPS dual band antenna, and a third means for
selecting either the mobile broadcast signal outputted from the first means or the
mobile broadcast signal outputted from the second means if the selected mobile
broadcast signal has a signal quality better than that of the non-selected mobile
broadcast signal.

Documents:

1056-kol-2005-assignment.pdf

1056-kol-2005-correspondence.pdf

1056-kol-2005-examination report.pdf

1056-kol-2005-form 18.pdf

1056-kol-2005-form 3.pdf

1056-kol-2005-form 5.pdf

1056-KOL-2005-FORM-27.pdf

1056-kol-2005-gpa.pdf

1056-kol-2005-granted-abstract.pdf

1056-kol-2005-granted-claims.pdf

1056-kol-2005-granted-description (complete).pdf

1056-kol-2005-granted-drawings.pdf

1056-kol-2005-granted-form 1.pdf

1056-kol-2005-granted-form 2.pdf

1056-kol-2005-granted-specification.pdf

1056-kol-2005-priority document.pdf


Patent Number 242630
Indian Patent Application Number 1056/KOL/2005
PG Journal Number 36/2010
Publication Date 03-Sep-2010
Grant Date 02-Sep-2010
Date of Filing 22-Nov-2005
Name of Patentee See attached documents
Applicant Address See attached documents
Inventors:
# Inventor's Name Inventor's Address
1 See attached documents See attached documents
PCT International Classification Number N/A
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA