CDMA MOBILE COMMUNICATION SYSTEM AND TRANSMISSION/ RECEPTION EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To shorten the time of code synchronous detection of spectrum spread and to prevent the degradation of synchronous detection characteristics in a CDMA mobile communication system. SOLUTION: On the transmission side, first, second,..., N-th spread codes are used for (a+1)th, (a+2)th,... (a+N)th symbols ((a) is an arbitrary integer) of information modulation symbols on the transmission side to perform spectrum spread and transmission. On the reception side, matched filters 22 to 24 matched to first,..., N-th spread codes are used to obtain a correlation waveform from a reception signal. A delay circuit 25 is used to delay this correlation waveform by 0 to N-1 information modulation symbols times, and the sequence of peak detection of correlation is detected to perform discrimination of a base station and detection of code synchronization. Thus, the time of code synchronous detection is shortened and the degradation of synchronous characteristics is prevented in comparison with the use of a sliding correlator.