System and method for providing channel equalization in orthogonal frequency division multiplexing (OFDM) wireless systems

Patent metadata

Field	Value
Publication number	US-9369328-B2
Application number	US-201514643278-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Mar 10, 2014
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

The present disclosure relates to a computer-implemented method for estimating a communication channel response, comprising procedures such as: receiving, via the channel, a signal comprising a plurality of symbols, each comprising a plurality of sub-carriers; determining a pilot sub-carrier response and a pilot sub-carrier metric for one or more pilot sub-carriers; and for one or more non-pilot sub-carriers: i) determining a non-pilot sub-carrier metric; ii) if the non-pilot sub-carrier metric satisfies a criterion, determining a particular component (e.g., real or imaginary) of a non-pilot sub-carrier response as a function of different components of one or more pilot sub-carrier responses; and iii) if the non-pilot sub-carrier metric does not satisfy the criterion, determine the particular component of the non-pilot sub-carrier response as a function of the particular component of one or more pilot sub-carrier responses. Other embodiments include a communication apparatus and a computer-readable medium configurable to perform such procedures.

First claim

What is claimed is:

1. A non-transitory, computer-readable medium providing computer-executable instructions for estimating a response of a communication channel, wherein, when executed by a computer arrangement, the instructions specifically configure the computer arrangement to execute procedures comprising:
receiving, via the communication channel, a signal comprising a plurality of symbols, each symbol comprising (i) one or more pilot sub-carriers and (ii) one or more non-pilot sub-carriers;
for each of the one or more pilot sub-carriers, determining a pilot sub-carrier response and a pilot sub-carrier metric; and
for each of the one or more non-pilot sub-carriers:
determining a non-pilot sub-carrier metric; and
if the non-pilot sub-carrier metric satisfies a predetermined criterion, determining a particular component of a non-pilot sub-carrier response as a function of components, different from the particular component, of one or more pilot sub-carrier responses.

2. The computer-readable medium of claim 1 , wherein the instructions further configure the computer arrangement to:
for each of the one or more non-pilot sub-carriers:
if the non-pilot sub-carrier metric does not satisfy the predetermined criterion, determine the particular component of the non-pilot sub-carrier response as a function of the particular component of one or more pilot sub-carrier responses.

3. The computer-readable medium of claim 1 , wherein the instructions configure the computer arrangement to determine the response, the pilot sub-carrier metric, and the non-pilot sub-carrier metric in a particular dimension.

4. The computer-readable medium of claim 3 , wherein the particular dimension is at least one of a symbol dimension or a sub-carrier dimension.

5. The computer-readable medium of claim 3 , wherein the pilot sub-carrier metric comprises a rate of slope change of the pilot sub-carrier response proximate to the pilot sub-carrier in the particular dimension.

6. The computer-readable medium of claim 5 , wherein the non-pilot sub-carrier metric comprises a weighted average of pilot sub-carrier metrics corresponding to one or more pilot sub-carriers proximate to the non-pilot sub-carriers in the particular dimension.

7. The computer-readable medium of claim 1 , wherein the predetermined criterion comprises the particular component of the non-pilot sub-carrier metric being less than a function of a plurality of other components of the non-pilot sub-carrier metric.

8. The computer-readable medium of claim 7 , wherein:
the particular component comprises a real component; and
if the predetermined criterion is satisfied, the computer arrangement is configured to determine the real component of the non-pilot sub-carrier response as a function of imaginary and absolute value components of the one or more pilot sub-carrier responses.

9. The computer-readable medium of claim 7 , wherein:
the particular component comprises an imaginary component; and
if the predetermined criterion is satisfied, the computer arrangement is configured to determine the imaginary component of the non-pilot sub-carrier response as a function of real and absolute value components of the one or more pilot sub-carrier responses.

10. The computer-readable medium of claim 1 , wherein:
each of the one or more pilot sub-carrier responses, the one or more pilot sub-carrier metrics, and the one or more non-pilot sub-carrier metrics comprises a particular dimension and a further dimension;
for each of the one or more non-pilot sub-carriers:
if the non-pilot sub-carrier metric in the particular dimension satisfies the predetermined criterion, determine the particular component of the non-pilot sub-carrier response as a function of components, different from the particular component, of one or more pilot sub-carrier responses in the particular dimension.

11. The computer-readable medium of claim 2 , wherein:
each of the one or more pilot sub-carrier responses, the one or more pilot sub-carrier metrics, and the one or more non-pilot sub-carrier metrics comprises a particular dimension and a further dimension;
for each of the one or more non-pilot sub-carriers:
if the non-pilot sub-carrier metric does not satisfy the predetermined criterion based on the non-pilot sub-carrier metric in the particular dimension satisfying a first criterion, determine the particular component of the non-pilot sub-carrier response as a function of the particular component of one or more pilot sub-carrier responses in the particular dimension; or
if the non-pilot sub-carrier metric does not satisfy the predetermined criterion based on the non-pilot sub-carrier metric in the further dimension satisfying the first criterion, determine the particular component of the non-pilot sub-carrier response as a function of the particular component of one or more pilot sub-carrier responses in the further dimension.

12. The computer-readable medium of claim 10 , wherein the particular dimension is one of a symbol dimension or a sub-carrier dimension, and the further dimension is a different one of a symbol dimension or a sub-carrier dimension.

13. The computer-readable medium of claim 10 , wherein the pilot sub-carrier metric comprises a rate of slope change of the pilot sub-carrier response proximate to the pilot sub-carrier in the particular dimension.

14. The computer-readable medium of claim 10 , wherein the non-pilot sub-carrier metric comprises a weighted average of pilot sub-carrier metrics corresponding to a portion of the one or more pilot sub-carriers, the portion being proximate to the non-pilot sub-carrier in the particular dimension.

15. The computer-readable medium of claim 11 , wherein the first criterion comprises the particular component of the non-pilot sub-carrier metric in the particular dimension being less than all of: a function of other components of the non-pilot sub-carrier metric in the particular dimension, the particular component of the non-pilot sub-carrier metric in the further dimension, and the function of other components of the non-pilot sub-carrier metric in the further dimension.

16. The computer-readable medium of claim 10 , wherein the predetermined criterion comprises the function of other components of the non-pilot sub-carrier metric in a particular dimension being less than all of: the particular component of the non-pilot sub-carrier metric in the particular dimension, the particular component of the non-pilot sub-carrier metric in the further dimension, and the function of other components of the non-pilot sub-carrier metric in the further dimension.

17. The computer-readable medium of claim 10 , wherein:
the particular component comprises a real component; and
if the predetermined criterion is satisfied, the computer arrangement is configured to determine the real component of the non-pilot sub-carrier response as a function of imaginary and absolute value components of the one or more pilot sub-carrier responses.

18. The computer-readable medium of claim 10 , wherein:
the particular component comprises an imaginary component, and
if the predetermined criterion is satisfied, the computer arrangement is configured to determine the imaginary component of the non-pilot sub-carrier response as a function of the real and absolute value components of the one or more pilot sub-carrier responses.

19. A communication apparatus, comprising:
a receiver;
a computer arrangement; and
a non-transitory, computer-readable medium comprising computer-executable instructions t

Assignees

• Univ New York

Inventors

• Dhananjay Aditya
• Li Jinyang
• Rangan Sundeep

Classifications

• H04L25/022

  of frequency response · CPC title

• H04L25/0234

  by non-linear interpolation · CPC title

• H04L25/023

  with extension to other symbols · CPC title

• H04L25/0202

  Channel estimation · CPC title

• H04L25/0232

  by interpolation between sounding signals · CPC title