CDMA Reverse Link Spatial Combining Gains: Optimal vs. MRC in a Faded Voice-Data System Having a Single Dominant High Data User

摘要

The per user carrier-to-interference ratio (CINR) enhancement in the Reverse Link (mobile to base station) of a CDMA communications system is analyzed using different antenna array spatial combining algorithms: Optimum Combining (OC) versus Maximal Ratio Combining (MRC) in a multi-rate (combined voice and data users) multi-antenna scenario. Many low data voice users and a single dominant high data user are used to achieve a high degree of colored spatial interference in the analysis. The ratio of the CINR for OC vs. MRC is directly analyzed, i.e. Z=CINRoc/CINRMRC instead of separate analysis of each CINR term: CINRoc and CINRMRC w',n 'a,er comparison. Exact solutions are derived for the statistics of a per user CINR0c/CINRMRC improvement, as a function of the high-level interference power to background noise, and is compared with CDMA Reverse Link Monte Carlo simulations.