| 摘要 |
<p>PURPOSE: To attain the data restoration of cross talk interference in a low level at low costs by processing a received signal by using a replica obtained by filtering a code coefficient sequence used by each system user for a signal spread in a CDMA system. CONSTITUTION: Symbol estimators 303-1 to 303-M of a signal collector 205 receive the demodulated signals of I and Q channels with symbols S1 to SM outputted by a symbol generator 301. The estimator 303-1 multiples the symbol S1 with a PN sequence for a user 1 by a multiplier 304, and multiplies it with I and Q channel PN sequences by multipliers 305 and 306. Each multiplied result is transmitted through LPF 307 and 308 with a prescribed transmission function, each demodulated signal, and results obtained by operating the estimate of each symbol by multiplier 309-312, integrators 313-316, subtracted 317, and adder 318 are outputted to buses 206 and 207. In the same way, the estimators 302-2 to 302-M perform the same operation. Thus, crosstalk interferenced the data restoration in a low level can be attained at low costs.</p> |
