Cyclic Prefixed OQAM-OFDM and its Application to Single-Carrier FDMA

• Published in: IEEE transactions on communications 2011-05, Vol.59 (5), p.1467-1480
• Main Authors: Xiqi Gao, Wenjin Wang, Xiang-Gen Xia, Au, Edward K S, Xiaohu You
• Format: Article
• Language: English
• Subjects: Applied sciences; Channels; Detection, estimation, filtering, equalization, prediction; envelope fluctuation; Envelopes; Equalization; Exact sciences and technology; Fading; Frequency division multiaccess; Frequency domain analysis; frequency domain equalization; Frequency domains; Information, signal and communications theory; Interference; Least mean squares algorithm; Mean square errors; Modulation, demodulation; Multiple access; Multiplexing; OFDM; Orthogonal Frequency Division Multiplexing; Orthogonal frequency division multiplexing (OFDM); Pulse shaping methods; Quadrature amplitude modulation; Receivers; Signal and communications theory; Signal, noise; single-carrier frequency division multiple access (SC-FDMA); Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); widely linear processing; Wireless networks
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/TCOMM.2011.031611.100045

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.