Method and apparatus for diversity reception of time-dispersed s

Pulse or digital communications – Repeaters – Testing

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375 14, 375 96, 375100, 455138, H04B 7005, H04B 708

Patent

active

050311930

ABSTRACT:
A method and appartus for diversity reception in a communication system wherein at least a dual branch receiver is provided with a stored replica of expected reference information that is correlated with the received time-dispersed signals to obtain an estimate of the transmission channel's impulse response as seen by each branch, and determine, among other things, phase error between the branch local oscillators and the time-dispersed signals. Matched filters are constructed which then coherently align the time-dispersed signals from each branch with that branch's local oscillator, also constituting the first part of the equalization. The diversity processing stage may perform bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, following each by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal. In digital modulated carrier systems, providing expected reference information eliminates the neeed for carrier recovery feedback for each branch while performing part of the equalization process.

REFERENCES:
patent: 3633107 (1972-01-01), Brady
patent: 4112370 (1978-09-01), Monsen
patent: 4271525 (1981-06-01), Watanabe
patent: 4281411 (1981-07-01), Bonn et al.
patent: 4328585 (1982-05-01), Monsen
patent: 4731801 (1988-03-01), Henriksson
patent: 4733402 (1988-03-01), Monsen
patent: 4829543 (1989-05-01), Borth et al.
G. Ungerboeck, "Adaptive Maximum Likelihood Receiver for Carrier-Modulated Data-Transmission Systems," IEEE Transactions on Communications, vol. COM-22, No. 5, May 1974, pp. 624-636.
G. D. Forney, "Maximum Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference", IEEE Transactions on Information Theory, vol. IT-18, No. 3, May, 1972, pp. 363-377.
John G. Proakis, "Digital Communications", McGraw-Hill Book Company, 1983, pp. 357-386.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for diversity reception of time-dispersed s 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 apparatus for diversity reception of time-dispersed s, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for diversity reception of time-dispersed s will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-623909

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.