Optimum PSK Signal Mapping for Multi-Phase Binary-CDMA Systems

Abstract

Although the CDMA system can efficiently support multiple users, may suffer from peak-to-average power ratio (PAPR) increases as the number of users increases. As a result, it needs highly linear power amplifiers with a large back off. Recently, a new CDMA scheme, called binary CDMA (B-CDMA), has been proposed to alleviate this problem by quantizing the envelope of multi-user CDMA signals into a small number of levels, while preserving the advantages of CDMA signaling [1]. The performance of B-CDMA system is mainly determined by the quantization and detection error. The quantization noise can be minimized using the Lloyd-max algorithm [2]. In this paper, the optimum PSK signal is designed to minimize the detection error in multi-phase B-CDMA systems. Finally, the analytic results are verified by computer simulation