THE ERROR PERFORMANCE OF CD900-LIKE CELLULAR MOBILE RADIO SYSTEMS

The symbol error performance of CD900-like digital cellular mobile radio systems over narrow-band and urban wide-band transmission channels is investigated. The basic performance is presented for Gaussian, flat fading Rayleigh and log-normal channels in the presence of selection and ratio combining space diversity schemes. For wide-band channels having more than one resolvable fading path, a CD900-like system without diversity reception suffers from large residual symbol error probabilities P(R) (almost-equal-to 10(-1)). The introduction of adaptive correlation diversity (ACD) mitigates the effects of multipath, yielding a P(R) of 6 x 10(-5). Although this P(R) value is relatively low, the probability of symbol error (P(e)) versus signal-to-noise ratio (SNR) is significantly poorer than for the Gaussian channel. By combining the ACD scheme with space diversity, the P(R) is eliminated for P(e) > 10(-5), and the channel SNR is within 5 dB of the Gaussian channel performance when P(e) is 10(-3).