Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1996-12-26
1999-11-09
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375267, 375349, 375206, 370342, 370479, 455101, H04B 710, H04B 702, H04L 102
Patent
active
059828250
ABSTRACT:
At a transmitter side, signals are provided with a delay difference with a plurality of branches, coded multiplexed by spectrum spreaders and a combination unit, and transmitted by a single antenna. At a receiver side, the signals are received by a single antenna, and diversity branches are extracted and separated by first and second spectrum de-spreaders. They are subject to linear combination so that the mean square of the decision error signals is minimized. The output passes through an adaptive matched filter and an adaptive equalizer so as to provide an output from which interference waves are eliminated. Thus, interference is eliminated and diversity gain for a signal is ensured, while reducing the scale and cost of a system without using a plurality of antennae.
REFERENCES:
patent: 5335359 (1994-08-01), Tsujimoto et al.
patent: 5379046 (1995-01-01), Tsujimoto
patent: 5524023 (1996-06-01), Tsujimoto
patent: 5568523 (1996-10-01), Tsujimoto
patent: 5636242 (1997-06-01), Tsujimoto
patent: 5757853 (1998-05-01), Tsujimoto
Japanese Office Action dated Jun. 16, 1998, with partial translation.
Chin Stephen
Maddox Michael W.
NEC Corporation
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