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

作者：Dan LiLin^*; Xiao Yue; Cheng Peng; Wu Gang; Li ShaoQian

来源：Science in China - Series F: Information Sciences , 2009, 52(12): 2433-2444.

DOI：10.1007/s11432-009-0211-9

• OFDM-CDMA
• spread-IFFT (S-IFFT)
• multiple signal representation (MSR)
• user grouping

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.

• 出版日期2009-12
• 单位电子科技大学