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DS-CDMA and MC-CDMA with Per-User MMSE Frequency Domain Equalization (Electronics Project)

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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 MC-CDMA with PU-MMSE FDE, DS-CDMA with  PU-MMSE FDE has no performance loss and has much lower peak-to-average power ratio (PAPR).
Source: SERSC
Author: Tao LUO, Gang WU, Shaoqian LI, Yong Liang GUAN, Choi Look LAW

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