Parallel interference cancellation with reduced complexity for multi-carrier spread-spectrum FCDMA
Achim Nahler, Ralf Irmer, Gerhard Paul Fettweis · 2002
The performance of code division multiple access (CDMA) systems is limited by multiple access interference (MAI) which can be overcome by multi-user detection schemes. Interference cancellation seems to be a good compromise in terms of performance and computational complexity compared to optimum multi-user detection or linear transformations e.g. based on the MMSE criterion. In this paper, the performance and complexity of parallel interference cancellation (PIC) are investigated for a multi-carrier spread-spectrum frequency code division multiple access (MC-SS FCDMA) system. Evaluating the structure of MAI, the PIC is modified to reduce its complexity to the order of the single-user detector while keeping the bit error rate in the range of the conventional PIC value.