Method and system for joint timing recovery and channel estimati

Details Method and system for joint timing recovery and channel estimati Method and system for joint timing recovery and channel estimati

1997-11-03

2000-10-24

Chin, Stephen

Pulse or digital communications

Synchronizers

375222, 375377, H04L 700

Patent

active

061378488

ABSTRACT:
A method and a system for acquiring data frame timing in a discrete multitone modem system in which an acquisition frame is generated having a first predetermined number of impulse signals. Each impulse signal is spaced in time by 2(P+1)T.sub.s, such that 1/T.sub.s is a sample transmission rate, and P is a time length in samples of a cyclic prefix that is added to a data frame. The cyclic prefix length P is chosen such that a channel impulse response seen at a receiver effectively spans no more than P+1 samples when a received signal is sampled at the 1/T.sub.s rate. Data frames are generated subsequent to the acquisition frame. Each data frame includes a cyclic prefix and at least as many data samples as samples of the cyclic prefix. The acquisition and data frames are converted to an analog signal for transmission. The received acquisition frame is sampled and a summation window is advanced one sample at a time through the received acquisition frame. The sampled acquisition frame is summed over each summation window, with each summation window spanning P+1 samples of the acquisition frame. A maximum summation value is determined as the summation window advances, and a data frame boundary is determined based on the summation window corresponding to the maximum summation value. A channel impulse response is estimated based on the P+1 samples of the received acquisition frame corresponding to the maximum summation value, and data is coherently detected based on the estimated channel impulse response.

REFERENCES:
patent: 5790514 (1998-08-01), Marchok et al.
patent: 6005893 (1999-12-01), Hyll
patent: 6021167 (2000-02-01), Wu
patent: 6038251 (2000-03-01), Chen
U.S. Patent No. 5,625,651, filed on 6/2/94 and issued on 4/29/97 to Cioffi.
U.S. Patent No. 5,319,679, filed on 12/9/92 and issued on 6/7/94 to Bagby.
U.S. Patent No. 5,570,370, filed on 4/28/95 and issued on 10/29/96 to Lin.
U.S. Patent No. 4,416,015, filed on 12/30/81 and issued on 11/15/83 to Gitlin.
U.S. Patent No. 4,285,061, filed on 9/14/79 and issued on 8/18/81 to Ho.

Affiliated with

Also associated with

Rating

Method and system for joint timing recovery and channel estimati does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for joint timing recovery and channel estimati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for joint timing recovery and channel estimati will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1972716