Single-carrier block transmission asynchronous CDMA with frequency-domain equalization

研究成果: Conference contribution

摘要

Single-carrier (SC) block transmission with frequency-domain equalization (FDE) [1][2] is an efficient scheme that avoids complex time-domain equalization in multipath channels. There are also several systems proposed that apply SC-FDE in code-division multiple access (CDMA). However, unlike the conventional CDMA RAKE receiver, most of the present SC-FDE CDMA systems may be not suitable for asynchronous users. In our previous work [10], a circularly sliding (CS) despreading was proposed at the receiver for preliminary separation of asynchronous users' signals. By neglecting other users' interference, an FD minimum mean-square error (MMSE) equalization algorithm was derived in [10]. However, only the scenario of two asynchronous users was considered, and no further approach for cancellation of other asynchronous users' interference was applied. In this paper, we first derive an extended signal model for which spreading, channel effect, CS despreading, and equalization can be represented as a series of circular convolutions. The extended signal model helps construct several equivalent receiver architectures. The complexity analysis of these architectures is also given. The extended signal model also implies an FD implementation of the RAKE receiver. To improve the performance of the signal detection for asynchronous users, we propose an interference cancellation (IC) algorithm under the above SC architectures and FD-MMSE equalization. We compare the performance of FD-MMSE equalization with the RAKE receiver and consider the situations with and without the IC algorithm. The simulation results validate the effectiveness of our algorithm.

原文English
主出版物標題WCNC 2008 - IEEE Wireless Communications and Networking Conference, Conference Proceedings
頁面453-458
頁數6
出版狀態Published - 2008
事件IEEE Wireless Communications and Networking Conference, WCNC 2008 - Las Vegas, NV, United States
持續時間: 2008 3月 312008 4月 3

Other

OtherIEEE Wireless Communications and Networking Conference, WCNC 2008
國家/地區United States
城市Las Vegas, NV
期間08-03-3108-04-03

All Science Journal Classification (ASJC) codes

  • 工程 (全部)

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