Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1993-08-20
1995-11-07
Tse, Young
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375325, 375331, 375347, 329304, 455137, H04B 702, H04L 102
Patent
active
054652715
ABSTRACT:
A digital radio communications system employs a digital information source for providing digital information such as message bits, a transmitter for transmitting encoded digital information into data symbols in a radio-frequency (RF) signal to a plurality of antennae which sense the transmitted RF signal. A post detection measure of signal quality, the signal-to-impairment ratio, (SIR), is utilized by the receiver to perform post detection combining of signals received by a plurality of antennae. The antennae are coupled to a receiver which for each received signal: digitizes the signal, determines phase angles of the digitized signal, converts the signal to unit vectors, determines a signal-to-impairment ratio (SIR) estimates .gamma..sup.j of the digitized signals. The SIR estimate .gamma..sup.j is weighted by combining weight computation element and multiplied by each unit vector to provide an in-phase is component and a quadrature component for each signal. The in-phase components are combined into a in-phase composite signal I.sub.c (n). The quadrature-phase components are combined into a quadrature-phase composite signal Q.sub.c (n). The composite signal (I.sub.c (n), Q.sub.c (n) is then decoded into phase angles which are reversed mapped to message bits which are utilized by an output device resulting in a radio communication system exhibiting improved performance during radio "fade" periods.
REFERENCES:
patent: 5001724 (1991-03-01), Birgenheier et al.
patent: 5187719 (1993-02-01), Birgenheier et al.
patent: 5255290 (1993-10-01), Anvari
"Linear Diversity Combining Techniques" by D. G. Brennan, pp. 1075-1102, proceedings of the IRE, Jun. 1959.
"A Power-Spectral Theory of Propagation in the Mobile-Radio Environment" by M. J. Gans, IEEE Transactions on Vehicular Technology, vol. VT-21, No. 1, pp. 27-38, Feb. 1972.
"A Fully Digital Hardware Detector for p/4 QPSK" by C. P. LaRosa, M. J. Carney, Proceedings of the 42nd IEEE Vehicular Technology Conference, May 1992, pp. 293-297.
Chennakeshu Sandeep
Hladik Stephen M.
General Electric Company
Snyder Marvin
Tse Young
Zale Lawrence P.
LandOfFree
Post detection weighted vector combining diversity receivers usi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Post detection weighted vector combining diversity receivers usi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Post detection weighted vector combining diversity receivers usi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-201450