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A low-complexity multiple signal representation scheme in downlink OFDM-CDMA

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Abstract

OFDM-CDMA is an attractive technique for broadband wireless communication. However, the high peak-to-average power ratio (PAPR) of the downlink signals, generated from multiple spread codes, remains a serious problem. In this paper, a low-complexity multiple signal representation (MSR) scheme is proposed to control the PAPR problem in downlink OFDM-CDMA systems. The proposed scheme generates multiple candidate signals by a novel user grouping scheme, which is without distortion and can provide more PAPR reduction than the conventional MSR schemes, such as partial transmit sequence (PTS) and selective mapping (SLM). Furthermore, a low-complexity processing structure is developed using a novel joint spreading and inverse fast Fourier transform (S-IFFT) to simplify the generation of multiple candidate signals. Complexity analysis and numerical results show that the OFDM-CDMA systems employing the proposed scheme have better tradeoff between PAPR reduction and computational complexity, compared with the conventional MSR schemes.

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Authors and Affiliations

  1. National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, 610054, China

    LiLin Dan, Yue Xiao, Peng Cheng, Gang Wu & ShaoQian Li

Authors
  1. LiLin Dan
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  2. Yue Xiao
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  3. Peng Cheng
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  4. Gang Wu
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  5. ShaoQian Li
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Correspondence to LiLin Dan.

Additional information

Supported in part by DoCoMo Beijing Labs Co., Ltd., International Sci. & Tech. Cooperation Project of the Ministry of Sci. & Tech. of China (Grant No. 2008DFA11700), and the National Natural Science Foundation of China (Grant Nos. 60902026, 60602008)

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Dan, L., Xiao, Y., Cheng, P. et al. A low-complexity multiple signal representation scheme in downlink OFDM-CDMA. Sci. China Ser. F-Inf. Sci. 52, 2433–2444 (2009). https://doi.org/10.1007/s11432-009-0211-9

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  • DOI: https://doi.org/10.1007/s11432-009-0211-9

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