4-phase M-ary CDMA signal design and fast detection algorithm for approximately synchronized mobile systems without co-channel interference
N. Suehiro, Toshiaki Imoto · 2002
Suehiro has proposed a quadriphase signal design method for the uplink of cellular CDMA mobile communication systems. The designed signals work without co-channel interference when the systems are synchronized approximately. The designed signals are free from the influence of multipath signals within some delay. We assign plural quadriphase signals as M-ary signals for each user so that the information-transmission rate is increased. The property of without co-channel interference remains the same, but the multipath property becomes a little bit worse. Fast detection algorithms are also proposed for digital matched filter detection.