Analysis and Optimization of SIMO Systems with Adaptive Coded Modulation in Spatially Correlated Rayleigh Fading

In this paper we investigate the performance of an adaptive coded modulation (ACM) system in single-input multiple-output Rayleigh fading channels with spatial correlation. The considered ACM system has a set of multi-dimensional trellis codes from which it can adaptively select the code best suited to the channel quality. The channel quality is tracked at the receiver by a predictor using a pilot-symbol-assisted modulation scheme. We optimize both the pilot spacing, and the power allocation to pilot and data symbols. The channel predictor is made optimal in the maximum a posteriori sense and the correlation to other subchannels is taken into account. A numerical example is given for flat Rayleigh fading subchannels with Jakes correlation profile.