DS/CDMA receiver having an interference cancelling function capa

Details DS/CDMA receiver having an interference cancelling function capa DS/CDMA receiver having an interference cancelling function capa

1995-08-10

1997-11-11

Hsu, Alpus H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

370342, 370441, 375206, 375346, H04B 7216, H04J 1302

Patent

active

056871627

ABSTRACT:
In a DS/CDMA receiver, each of first and second receiving units (211 and 221) receives a DS/CDMA signal as a received signal. First and second adaptive interference cancellers (212+213, 222+223) are connected to the first and the second receiving units, respectively. Each of the adaptive interference cancellers cancels an interference on the received signal. Connected to the first and the second receiving units and to the first and the second adaptive interference cancellers, a single interference canceller control circuit (204) controls the first and the second adaptive interference cancellers in common. An all output combiner (201) combines all of output signals of the first and the second adaptive interference cancellers. Preferably, each of the adaptive interference cancellers has an adaptive filter (212 or 222) to cancel the interference with respect to all other stations by adaptively making its tap coefficients orthogonal to spreading codes of the all other stations. Each of the adaptive interference cancellers further has a differential detection circuit (213 or 223) to compensate for phase fluctuation of an output signal of the adaptive filter. The single interference canceller control circuit may control the adaptive interference cancellers in common on the basis of best quality control information relating to one of the received signals of the first and the second receiving units that has a best signal quality.

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