Architecture for per tone equalizer with reduced complexity...

Details Architecture for per tone equalizer with reduced complexity... Architecture for per tone equalizer with reduced complexity...

2007-08-21

2007-08-21

Tran, Khai (Department: 2611)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

10735011

ABSTRACT:
In accordance with an embodiment of the present invention an improved equalization system for DMT based modem receiver is provided. It includes a time domain equalizer for processing samples from an analog front end and includes a device for computing differences of time domain samples for every frame and the results are saved. An FFT is provided for calculating a first FFT and the results are saved in a FFT buffer so that at each DMT frame, after a difference and FFT operation, the FFT buffer contains the first FFT and v−1 time domain sample differences. A sliding FFT for each tone reads the first FFT result and v−1 FFTs and recursively computes the rest of v−1 FFTs for the particular tone. An equalizer is responsive to the computed sliding FFT for recursively computes equalizer outputs.

REFERENCES:
patent: 7058141 (2006-06-01), Nedic
patent: 2003/0091133 (2003-05-01), Redfern et al.
patent: 2004/0202259 (2004-10-01), Gross et al.
Van Acker, et al “Per Tone Equalization for DMT-Based System” IEEE Tran. Comm., vol. 49, No. 1 (Jan. 2001) pp. 109-119.
Vanbleu, Koen et al; Adaptive Bitrate Maximizing TEQ Design for DMT-Based Systems; 2004 IEEE; pp. 1057-1060.
Ysebaert, Geert et al.; Combined RLS-LMS Initialization for Per Tone Equalizers in DMT-Receivers; 2003 IEEE; pp. 1916-1927.
Vanbleu, Koen et al.; Bitrate Maximizing Time-Domain Equalizer Design for DMT-Based Systems; 2003 IEEE; pp. 2360-2364.
Ysebaert, Geert et al.; Bit-Rate Maximizing Windows and Equalizer Design for DMT-Systems; pp. 1923-1926.
Van Acker, Katleen et al.; Per Tone Equalization for DMT-Based Systems; IEEE Transactions on Communications, vol. 49, No. 1, Jan. 2001; pp. 109-119.

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