Performance of SIMO Channel Tracking Using Doppler Shift Information in Rician Fading

We consider recursive least-squares (RLS) channel tracking using Doppler shift information for single input multiple output (SIMO) systems. The communications is the downlink from a terrestrial or strato-spheric platform to a mobile user with an assumed known Doppler shift of the line-of-sight (LOS) channel component. The channel is modeled as time-varying Rician flat fading with elevation dependent Rician factor. The system performance is evaluated in terms of tracking mean square error (MSE) and bit error rate (BER). The performance gain of the system using Doppler information is more significant for moderate to high Rician factors or lower elevation angles.