On-Board Linear Interference Cancellation Multiuser Detection for Uplink CDMA GEO Satellite Systems

[Abstract] In this paper, various IC MUD schemes namely SIC, PIC and PPIC are investigated for on-board implementation of uplink CDMA GEO satellite systems. The IC MUD schemes offer low complexity since they utilize matched filtering principle to cancel the MAI. We investigate two-stage IC MUD comparison under 6-dB Rician fading channel for on-board implementation. The results indicate that a two-stage PPIC shows a significant improvement over the conventional PIC and can approach the two-stage SIC performance (that has the best performance, but incurs a relatively large delay in processing and requires users re-ordering accordingly to the received power levels). We also examine the impact of asynchronous transmission and different power distribution to the PPIC performance. The results show that PPIC is most suitable for on-board implementation in CDMA GEO satellite systems.