Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-09-27
1998-11-03
Pham, Chi H.
Pulse or digital communications
Receivers
Interference or noise reduction
375280, 375281, 375299, 455132, H04B 710, H04B 1112, H04L 2710, H04L 2704
Patent
active
058320440
ABSTRACT:
The present invention provides a bandwidth-efficient fading-resistant transmission scheme where a base station implements transmitter diversity using L antennas or L carrier frequencies or L time slots, regardless of the use of frame oriented power control. When the antennas or carriers are spaced sufficiently far apart, or when a different power is used for each power control frame, the transmission from each antenna or carrier or time frame undergoes independent fading. These transmissions are coordinated to mitigate the effects of Rayleigh fading and the mobile receiver can recover the entire L-dimensional transmitted vector as long as the signal energy of at least one coordinate is large enough. L-dimensional fading-resistant signal constellations are generated by maximizing a figure of merit for the Rayleigh fading channel. This scheme offers a significant performance improvement over a conventional single-antenna or single-carrier narrowband BPSK scheme when coding is ineffective due to slow fading. When there is background white Gaussian noise, the fading-resistant scheme has a significant energy savings advantage over an uncoded BPSK scheme, for a given bit error rate. In the forward link of a cellular network, where cochannel interference is the dominant source of noise, the fading-resistant scheme results in a significant capacity increase over uncoded BPSK, for a given bit error rate. Both coherent and differentially coherent systems are disclosed.
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DaSilva Victor M.
Sousa Elvino S.
Pham Chi H.
Schumacher Lynn C.
Sousa Elvino S.
Tran Khai
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