A New CDMA-Concept using Hybrid Modulation with Noncoherent Detection
نویسندگان
چکیده
Karl-Dirk KAMMEYER and Dirk NIKOLAI Univ. of Bremen, Dept. of Telecommunications1 , P.O. Box 33 04 40, D-28334 Bremen, Germany Tel.: ++(49)-421/218-2453, Fax: ++(49)-421/218-3341, E-mail: [email protected] Abstract2: In this paper, we present a novel transmission scheme with application to Direct Sequence Code Division Multiple Access (DSCDMA) combining M -ary orthogonal and PSK modulation. With this “hybrid” modulation procedure, additional data is transmitted in the phase of each M -ary symbol. Note that it is due to real valued symbols that this transmission capacity is lost in state-of-the-art communication systems. The bit error probability is derived for both PSK and DPSK as the additional modulation type for an AWGN channel. The analytical results are confirmed by simulations. Finally, we show that the hybrid scheme is applicable to the noncoherent reverse link of the American IS-95 system by introducing an additional DQPSK.
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