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Performance analysis of the orthogonal sequency division modulation for broadband mobile radio

The third generation of mobile radio systems will supply a wide range of services and bit rates from speech transmission of a few kbit/s to video transmission of 2 Mbit/s for a user. Different techniques have been proposed to cope with the severe frequency selective fading at the high end of the data rates. Especially orthogonal frequency division multiplexing (OFDM) has received attention in recent years. A novel parallel multiplexing transmission method called orthogonal sequency division multiplexing (OSDM), has been proposed by Zhang and Rutkowski (see Proc. of 45th IEEE Vehicular Technology Conference, vol.2, p.810-14, 1995) which is based on orthogonal Walsh functions. This method can easily be combined with the DS/CDMA capabilities in combating multipath effect. It also makes possible the coherent demodulation (even over uplink) by efficiently inserting a pilot signal. In this paper, the performance of this system is investigated for an equal-gain combining receiver under slowly Rayleigh fading channel. The results have suggested that this scheme is an attractive candidate for the broadband data transmission.