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CP-OQAM-OFDM based SC-FDMA: adjustable user bandwidth and space-time coding

Wang, W., Gao, X., Zheng, F.-C. and Zhong, W. (2013) CP-OQAM-OFDM based SC-FDMA: adjustable user bandwidth and space-time coding. IEEE Transactions on Wireless Communications, 12 (9). pp. 4506-4517. ISSN 1536-1276

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To link to this item DOI: 10.1109/TWC.2013.072613.121650

Abstract/Summary

The discrete Fourier transmission spread OFDM DFTS-OFDM) based single-carrier frequency division multiple access (SC-FDMA) has been widely adopted due to its lower peak-to-average power ratio (PAPR) of transmit signals compared with OFDM. However, the offset modulation, which has lower PAPR than general modulation, cannot be directly applied into the existing SC-FDMA. When pulse-shaping filters are employed to further reduce the envelope fluctuation of transmit signals of SC-FDMA, the spectral efficiency degrades as well. In order to overcome such limitations of conventional SC-FDMA, this paper for the first time investigated cyclic prefixed OQAMOFDM (CP-OQAM-OFDM) based SC-FDMA transmission with adjustable user bandwidth and space-time coding. Firstly, we propose CP-OQAM-OFDM transmission with unequally-spaced subbands. We then apply it to SC-FDMA transmission and propose a SC-FDMA scheme with the following features: a) the transmit signal of each user is offset modulated single-carrier with frequency-domain pulse-shaping; b) the bandwidth of each user is adjustable; c) the spectral efficiency does not decrease with increasing roll-off factors. To combat both inter-symbolinterference and multiple access interference in frequencyselective fading channels, a joint linear minimum mean square error frequency domain equalization using a prior information with low complexity is developed. Subsequently, we construct space-time codes for the proposed SC-FDMA. Simulation results confirm the powerfulness of the proposed CP-OQAM-OFDM scheme (i.e., effective yet with low complexity).

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science
ID Code:34102
Uncontrolled Keywords:Orthogonal frequency division multiplexing (OFDM), Alamouti codes, single-carrier frequency division multiple access (SC-FDMA), frequency domain equalization.
Publisher:IEEE Communications Society

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