IP Library Granted Patent US 9,553,740
Granted Patent B2
US 9,553,740 · App. 14/482,280 · Granted Jan 24, 2017

Method and apparatus for equalizing signals

Inventor: Arunabha Ghosh (Austin, TX)
Assignee: AT&T Intellectual Property I, L.P.
H04L25/03159H04B7/2628H04L25/0202H04L25/03012H04L25/03057H04W72/04
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Quick Facts
Patent No.
US 9,553,740
App. No.
14/482,280
Granted
Jan 24, 2017
Kind
B2
Abstract

A system and apparatus are disclosed for a method and apparatus for equalizing signals. An apparatus that incorporates teachings of the present disclosure may include, for example, an equalizer having a channel estimation calculator for calculating a time domain channel estimation from a baseband signal, a Fast Fourier Transform processor for translating the time domain channel estimation to a frequency domain channel estimation, a tap weight calculator for calculating a frequency domain tap weight according to the frequency domain channel estimation, an inverse Fast Fourier Transform processor for translating the frequency domain tap weight calculation to a time domain tap weight calculation, and a filter for equalizing the baseband signal according to the time domain tap weight calculation.

Claims (44)

1. A communications device, comprising:

a transceiver operating in a wideband code division multiple access high speed downlink packet access communication system;

a processing system including a processor; and

a memory that stores executable computer instructions, when executed by the processing system, facilitate performance of operations comprising:

converting a carrier signal to a baseband signal;

calculating a time domain channel estimation from the baseband signal;

translating the time domain channel estimation to produce a frequency domain channel estimation;

performing a frequency domain tap weight calculation according to the frequency domain channel estimation;

translating the frequency domain tap weight calculation to a time domain tap weight calculation;

equalizing the baseband signal according to the time domain tap weight calculation to provide an equalized signal; and

restoring signal integrity to the baseband signal based on the equalized signal as a restored baseband signal.

2. The communications device of claim 1 , further comprising an audio system.

3. The communications device of claim 2 , wherein the audio system is configured to intercept or convey audible signals.

4. The communications device of claim 2 , wherein operations further comprise conveying audible signals according to the restored baseband signal.

5. The communications device of claim 1 , comprising an antenna coupled to the transceiver.

6. The communications device of claim 1 , further comprising a display.

7. The communications device of claim 6 , wherein the operations further comprise conveying visual signals according to the restored baseband signal.

8. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processing system including a processor, facilitate performance of operations, comprising:

converting a carrier signal to a baseband signal;

calculating a time domain channel estimation from the baseband signal;

translating the time domain tap weight calculation to produce a frequency domain channel estimation;

performing a frequency domain tap weight calculation according to the frequency domain channel estimation;

translating the frequency domain channel estimation to a time domain tap weight calculation;

equalizing the baseband signal according to the time domain tap weight calculation to provide an equalized signal; and

restoring signal integrity to the baseband signal based on the equalized signal as a restored baseband signal.

9. The non-transitory machine-readable storage medium of claim 8 , wherein the operations further comprise applying a Fast Fourier Transform to the time domain channel estimation to produce the frequency domain channel estimation.

10. The non-transitory machine-readable storage medium of claim 8 , wherein the operations further comprise applying an inverse Fast Fourier Transform to the frequency domain tap weight calculation to produce the time domain tap weight calculation.

11. The non-transitory machine-readable storage medium of claim 8 , wherein the equalizing comprises averaging, wherein the averaging is performed from one frame to a next frame.

12. The non-transitory machine-readable storage medium of claim 8 , wherein the carrier signal comprises one a data signal, a video signal, an audio signal, or a combined video or audio signal.

13. The non-transitory machine-readable storage medium of claim 8 , wherein the operations further comprise conveying audible signals according to the restored baseband signal.

14. The non-transitory machine-readable storage medium of claim 8 , wherein the operations further comprise conveying visual signals according to the restored baseband signal.

15. A method, comprising:

converting, by a processing system including a processor, a carrier signal to a baseband signal;

calculating, by the processing system, a time domain channel estimation from the baseband signal;

translating, by the processing system, the time domain channel estimation to produce a frequency domain channel estimation;

performing, by the processing system, a frequency domain tap weight calculation according to the frequency domain channel estimation;

translating, by the processing system, the frequency domain tap weight calculation to a time domain tap weight calculation;

equalizing, by the processing system, the baseband signal according to the time domain tap weight calculation to provide an equalized signal; and

restoring, by the processing system, signal integrity to the baseband signal based on the equalized signal as a restored baseband signal.

16. The method of claim 15 , further comprising applying a Fast Fourier Transform to the time domain channel estimation to produce the frequency domain channel estimation.

17. The method of claim 15 , further comprising applying an inverse Fast Fourier Transform to the frequency domain tap weight calculation to produce the time domain tap weight calculation.

18. The method of claim 15 , wherein, in the equalizing, averaging is performed from one frame to a next frame.

19. The method of claim 15 , wherein the carrier signal comprises one of a data signal, a video signal, an audio signal, or a combined video or audio signal.

20. The method of claim 15 , further comprising, by the processing system, conveying audible signals according to the restored baseband signal.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 15, 2014
From: GHOSH, ARUNABHA
To: SBC KNOWLEDGE VENTURES, L.P.
Reel/Frame 033740/0276 →
CHANGE OF NAME Recorded Sep 15, 2014
From: SBC KNOWLEDGE VENTURES, L.P.
To: AT&T KNOWLEDGE VENTURES, L.P.
Reel/Frame 033744/0618 →
CHANGE OF NAME Recorded Sep 15, 2014
From: AT&T KNOWLEDGE VENTURES, L.P.
To: AT&T INTELLECTUAL PROPERTY I, L.P.
Reel/Frame 033744/0687 →
Continuity (3)
Continuation 13677464 · Nov 15, 2012
Continuation 11225635 · Sep 13, 2005
Related Publication 20150055631A1 · Feb 26, 2015