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DS-CDMA and MC-CDMA with Per-User MMSE Frequency Domain Equalization
Tao LUO,Gang WU,Shaoqian LI,Yong Liang GUAN,Choi Look LAW 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.3
The future wireless mobile communication systems will be required to support high-speed transmission rate. Direct sequence code-division multiple access (DS-CDMA) and multicarrier (MC-) CDMA are two important CDMA schemes for high rate wireless communication. A novel linear per user minimum mean square error (PU-MMSE) detection technique for DS-CDMA with frequency domain equalization (FDE) based on the MMSE criterion applied per user is presented. It is shown by computer simulation that PU-MMSE outperforms conventional per carrier (PC-) MMSE for DS-CDMA with FDE in frequency selective block fading channel. Especially, in case of uplink PU-MMSE gains better performance than conventional MMSE not only for non-full-load DS-CDMA with FDE but also for full-load DS-CDMA with FDE. The performance of DS-CDMA with PU-MMSE FDE can be further promoted by successive interference cancellation (SIC). Comparing to MCCDMA with PU-MMSE FDE, DS-CDMA with PU-MMSE FDE has no performance loss and has much lower peak-to-average power ratio (PAPR).