Title of Invention

A METHOD OF CHANNEL ESTIMATION

Abstract The method of channel estimation determines linear regression coefficients for N blocks of a first signal component in a received signal on a block-by-block basis, and determines a channel estimate based on the linear regression coefficients for the N blocks. Using the channel estimate, channel distortion in a second signal component of the received signal can be significantly eliminated.
Full Text

By applying the complex conjugate of the channel estimate to a second signal component in the received signal, the channel distortion in the second signal component can be significantly reduced.
Furthermore, by estimating the distortion caused by frequency offset (frequency mismatch between the modulator of the transmitter and the demodulator of the receiver) and compensating for the frequency offset prior to performing channel estimation, a much larger sampling window is used to perform the channel estimation. This translates into greater noise immunity.
Accordingly, the present invention provides a method of channel estimation, comprising storing linear regression coefficients for each of a first to (N-l)th block for N blocks of a first signal component in a received signal, each of said N blocks including a number of samples of said first signal component; receiving samples in an Nth block of said N blocks; determining linear regression coefficients for said Nth block using said received samples; and obtaining a channel estimate based on said linear regression coefficients for said N blocks.
The present invention will become more fully understood from the detailed description given herein below and the accompanying drawings which are given by way of illustration only, wherein like reference numerals designate corresponding parts in the various drawings, and wherein :
Fig. 1 illustrates the device for generating a channel estimate and performing channel estimate compensation according to the present invention; and

Fig. 2 illustrates a flow chart of the method for generating a channel estimate according to the present invention.
Fig. 1 illustrates the device for generating a channel estimate and
performing channel estimate compensation according to the present invention.
As shown, a received signal is supplied to a frequency offset









WE CLAIM :
1. A method of channel estimation, comprising:
a) storing linear regression coefficients for each of a first to (N-l)th block for N blocks of a first signal component in a received signal, each of said N blocks including a number of samples of said first signal component;
b) receiving samples in an Nth block of said N blocks;
c) determining linear regression coefficients for said Nth block using said received samples; and
d) obtaining a channel estimate based on said linear regression coefficients for said N blocks.

2. The method as claimed in claim 1, wherein prior to said step (a) frequency offset in said first signal component is compensated.
3. The method as claimed in claim 1, wherein said step (a) comprises al) storing linear regression coefficients for each of a first to (N-l)th block of said N blocks; a2) receiving samples in an Nth block of said N blocks; and a3) determining linear regression coefficients for said Nth block using said received samples.
4. The method as claimed in claim 1, wherein said step a) stores, for each of said first to (N-l)th blocks, a slope and a mean of a line, which minimizes a mean square error of samples in a corresponding one of said first to (N-l)th blocks, as said linear regression coefficients of said first to (N-l)th blocks.
5. The method as claimed in claim 4, wherein said step c) determines a

slope and a mean of a line, which minimizes a mean square error of said received samples in said Nth block, as said linear regression coefficients of said Nth block.
6. The method as claimed in claim 5, wherein said step d) obtains a slope and a mean of a line, which minimizes a mean square error of samples in said first to Nth blocks as represented by said linear regression coefficients for said first to Nth blocks, as said channel estimate.
7. The method as claimed in claim 1, wherein said step c) determines a slope and a mean of a line, which minimizes a mean square error of said received samples in said Nth block, as said linear regression coefficients of said Nth block.
8. The method as claimed in claim 1, wherein said step d) obtains a slope and a mean of a line, which minimizes a mean square error of samples in said first to Nth blocks as represented by said linear regression coefficients for said first to Nth blocks, as said channel estimate.
9. The method as claimed in claim 1, wherein said first signal component is a known signal component.
10. The method as claimed in claim 9, wherein said known signal component is a pilot signal of a CDMA2000 system.
11. The method as claimed in claim 9, wherein said known signal component is a periodic training sequence.
12. The method as claimed in claim 1, wherein said first signal component is a non-coherent detection of a data signal.

13. The method as claimed in claim 1, comprising the step of determining
symbols of a second signal component using said channel estimate.
14. The method as claimed in claim 13, wherein said first signal component
is a periodic training sequence of a signal segment.
15. The method as claimed in claim 14, wherein said second signal
component is a non-training sequence portion of said signal segment.
16. The method as claimed in claim 13, wherein said first signal component
is a signal segment resulting from a non-coherent detection of said first
signal component in said received signal, and said second signal
component is said received signal.
17. The method as claimed in claim 1, comprising the step of adaptively
changing a value of N.
18. The method as claimed in claim 17, wherein said value N is step
adaptively changed based on linear coefficients for at least one of said N
blocks.
19. A method of channel estimation, substantially as herein described with
reference to the accompanying drawings.


Documents:

305-mas-2000-abstract.pdf

305-mas-2000-assignment.pdf

305-mas-2000-claims duplicate.pdf

305-mas-2000-claims original.pdf

305-mas-2000-correspondance others.pdf

305-mas-2000-correspondance po.pdf

305-mas-2000-description complete duplicate.pdf

305-mas-2000-description complete original.pdf

305-mas-2000-drawings.pdf

305-mas-2000-form 1.pdf

305-mas-2000-form 26.pdf

305-mas-2000-form 3.pdf

305-mas-2000-form 5.pdf

305-mas-2000-other documents.pdf


Patent Number 206491
Indian Patent Application Number 305/MAS/2000
PG Journal Number 26/2007
Publication Date 29-Jun-2007
Grant Date 27-Apr-2007
Date of Filing 20-Apr-2000
Name of Patentee M/S. LUCENT TECHNOLOGIES INC
Applicant Address 600 MOUNTAIN AVENUE, MURRAY HILL, NEW JERSEY 07974-0636.
Inventors:
# Inventor's Name Inventor's Address
1 R MICHAEL BUEHRER 1 LONGVIEW TERRACE, MORRISTOWN, NEWJERSEY 07960.
2 STEVEN PETER NICOLOCO 17 DOGWOOD ROAD,MORRISTOWN,NEW JERSEY 07960
3 DIRCL UPTEGROVE 13 GUNTHER STREET,MENDHAM,NEW JERSEY,07945
4 SHANG-CHIEH LIU
PCT International Classification Number H04B17/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 09/296654 1999-04-23 U.S.A.