Cyclic Prefixed OQAM-OFDM and its Application to Single-Carrier FDMA
Cyclic Prefixed OQAM-OFDM and its Application to Single-Carrier FDMA
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循环前缀OQAM-OFDM及其在单载波FDMA中的应用
DOI：
10.1109/tcomm.2011.031611.100045
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发表时间：
2011-05-01
影响因子：
8.3
通讯作者：
You, Xiaohu
中科院分区：
文献类型：
--
作者：
Gao, Xiqi;Wang, Wenjin;You, Xiaohu
单载波频分多址（SC-FDMA）是一种很有前途的高数据速率上行通信技术。针对SC-FDMA应用，本文首次提出了基于偏移正交调幅的OFDM （OQAM-OFDM）的循环前缀版本。我们证明循环前缀OQAM-OFDM （CP-OQAM-OFDM）可以在标准OFDM系统的框架内实现，并推导出理想信道下的完美恢复条件。然后，我们将CP-OQAM-OFDM应用于频率选择性衰落信道中的SC-FDMA传输。提出了基于低复杂度先验信息的信号模型和联合广义线性最小均方误差均衡化方法。与现有的基于DFTS-OFDM的SC-FDMA相比，本文提出的SC-FDMA可以在保持带宽效率的同时显著降低传输信号的包络波动（EF）。CP-OQAM-OFDM的固有结构使其能够在频域实现低复杂度的联合均衡，同时对抗多址干扰和码间干扰。使用先验信息的联合WLMMSE均衡保证了最佳的MMSE性能，并支持Turbo接收器提高误码率（BER）性能。仿真结果证实了SC-FDMA在EF（包括峰值平均功率比、瞬时平均功率比和立方度量）和误码率性能方面的有效性。
Single-carrier frequency division multiple access (SC-FDMA) has appeared to be a promising technique for high data rate uplink communications. Aimed at SC-FDMA applications, a cyclic prefixed version of the offset quadrature amplitude modulation based OFDM (OQAM-OFDM) is first proposed in this paper. We show that cyclic prefixed OQAM-OFDM (CP-OQAM-OFDM) can be realized within the framework of the standard OFDM system, and perfect recovery condition in the ideal channel is derived. We then apply CP-OQAM-OFDM to SC-FDMA transmission in frequency selective fading channels. Signal model and joint widely linear minimum mean square error (WLMMSE) equalization using a prior information with low complexity are developed. Compared with the existing DFTS-OFDM based SC-FDMA, the proposed SC-FDMA can significantly reduce envelope fluctuation (EF) of the transmitted signal while maintaining the bandwidth efficiency. The inherent structure of CP-OQAM-OFDM enables low-complexity joint equalization in the frequency domain to combat both the multiple access interference and the intersymbol interference. The joint WLMMSE equalization using a prior information guarantees optimal MMSE performance and supports Turbo receiver for improved bit error rate (BER) perform BER) performance. Simulation results confirm the effectiveness of the proposed SC-FDMA in terms of EF (including peak-to-average power ratio, instantaneous-to-average power ratio and cubic metric) and BER performances.