Adaptive equalization of digital modulating signal recovered...

Details Adaptive equalization of digital modulating signal recovered... Adaptive equalization of digital modulating signal recovered...

2006-05-23

2006-05-23

Tran, Khai (Department: 2634)

Pulse or digital communications

Equalizers

Automatic

C375S350000, C375S267000, C375S219000

Reexamination Certificate

active

07050491

ABSTRACT:
An adaptive equalizer for amplitude-modulation (AM) signal received by over-the-air radio transmission comprises feed-forward finite-impulse-response (FIR) filtering and further comprises infinite-impulse-response (IIR) filtering for feeding back decisions. The echo content of baseband signal demodulated from the AM signal is measured for initially determining the reception channel impulse response (CIR) in the time-domain. Thereafter, the CIR is updated by decision feedback. Periodically, the CIR is normalized with respect to the strength of a cursor component thereof. The strengths of longer-delay post-echoes in the normalized CIR are used to determine the weighting coefficients of the IIR filtering, which suppresses the longer-delay post-echoes. The pre-echo and short-delay post-echo portion of the normalized CIR is convolved with the normalized CIR to generate a synthetic normalized CIR. The strengths of pre-echoes and short-delay post-echoes in the synthetic normalized CIR are used to determine the weighting coefficients of the feed-forward FIR filtering, which suppresses the pre-echoes and short-delay post-echoes.

REFERENCES:
patent: 3614673 (1971-10-01), Kang
patent: 4027258 (1977-05-01), Perreault
patent: 5065242 (1991-11-01), Dietrich et al.
patent: 5251033 (1993-10-01), Anderson et al.
patent: 5479449 (1995-12-01), Patel et al.
patent: 5799037 (1998-08-01), Strolle et al.
patent: 6377312 (2002-04-01), Limberg et al.

Affiliated with

Also associated with

Rating

Adaptive equalization of digital modulating signal recovered... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive equalization of digital modulating signal recovered..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive equalization of digital modulating signal recovered... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3578933