Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-10-16
1999-12-14
Chin, Stephen
Pulse or digital communications
Receivers
Interference or noise reduction
375200, 455296, 370342, 370479, H03D 104
Patent
active
060027274
ABSTRACT:
The interference signal cancellation system of the invention has: usual CDMA demodulators respectively disposed for codes, each of the CDMA demodulators having a matched filter 105 and an identifier 107; and a likelihood calculator 108 for each of the demodulators. The apparatus further has: a buffer 103 which stores provisional decision values; another buffer 109 which stores likelihoods; an order determining device 110 which determines an order in accordance with the likelihoods; a respreading device 111 which performs respreading in accordance with the determined order; a delay device 102 which delays a received signal; and a subtractor 112 which subtracts a result of the respreading from the delayed data. For each symbol, the largest likelihood is selected, and a replica is generated by using it. A desired performance is attained by performing one provisional decision and one demodulation. Therefore, computational complexity is reduced and realization is facilitated.
REFERENCES:
patent: 4470138 (1984-09-01), Gutleber
patent: 5467368 (1995-11-01), Takeuchi et al.
patent: 5553062 (1996-09-01), Schilling et al.
Chin Stephen
Fan Chieh M.
Matsushita Electric - Industrial Co., Ltd.
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