Bit error rate (BER) performance of 16 — 128 kb/s Nyquist raised cosine filtered quaternary differential phase shift keying (RC-QDPSK) signal transmission is experimentally investigated. Two-branch postdetection selection diversity reception is employed. Measured results obtained by laboratory experiments are presented for the BER performance due to additive white Gaussian noise (AWGN), cochannel interference, and multipath channel delay spread. Field BER measurements are also conducted at a carrier frequency of 1.45 GHz in the Shinjuku area (in Tokyo), which is characterized by high-rise buildings and the Kofu area, which is surrounded by mountains. The results show that postdetection selection diversity is a simple, yet powerful technique to improve the BER performance in fading mobile radio channels.
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