Common channel interference cancellation for a spread spectrum system
K.A. Rizvi, M.P. Fitton, Y.C. Chow, Mahmoud H. Ismail, Y.Q. Bian · 2005
This paper has mainly focussed on evaluating the potential performance improvements that accrue from cancelling the common pilot channel's interference in terms of bit error rate performance for downlink applications. The impact of different cancellation strategies - sequential (SIC) and parallel (PIC) - has been presented for various data rates and channel profiles. With the investigative analysis appertaining to the FDD element of the UTRAN specified by 3GPP, the performance of the interference cancellation unit is primarily based on the elimination of the cross-correlation of the spreading codes over time dispersive wireless conditions. With a sound channel estimate, the results are shown to achieve near interference free performance, highlighting the potentiality of these interference cancellation schemes. Their versatility and robustness against channel estimation errors is further demonstrated by a relative performance comparison for a diversified range of data rates, pilot-to-data power ratios and channel conditions.