SIGNAL RECEIVER IN DS-CDMA CELLULAR SYSTEM

摘要

PROBLEM TO BE SOLVED: To obtain a small signal receiving device capable of coping with a multi-code by connecting plural arithmetic registers to one or plural corresponding matched filter(s) selectively through a register/multiplexer so as to allow one matched filter to intermittently execute inverse spreading by plural spreading signals. SOLUTION: One matched filter is provided with plural sample-and-hold parts SH1 to SHn an analog input signal Vin is connected to. These sample-and- hold circuits operate in response to a system clock and their outputs are inputted to corresponding multiplexers MUX1 to MUXn. Each multiplexer sorts the outputs of the sample-and-hold circuits into two groups in response to a spread code (the code string of one bit). Output signals in each group are inputted to an adding circuit ADD. The output of the circuit ADD is inputted to a scaler to be properly scaled to generate an output signal Vout.