tailieunhanh - Báo cáo hóa học: "Novel low-PAPR parallel FSOK transceiver design for MC-CDMA system over multipath fading channels"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : Novel low-PAPR parallel FSOK transceiver design for MC-CDMA system over multipath fading channels | Deng and Hwang EURASIP Journal on Wireless Communications and Networking 2011 2011 144 EURASIP Journal on . http content 2011 1 144 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Novel low-PAPR parallel FSOK transceiver design for MC-CDMA system over multipath fading channels Juinn-Horng Deng and Jeng-Kuang Hwang Abstract A low peak-to-average power ratio PAPR transceiver using a new parallel frequency-shift orthogonal keying FSOK technique is proposed for the multiuser uplink multi-carrier CDMA MC-CDMA system over multipath fading channels. By employing the frequency modulated and multiplexed FSOK techniques to combat the multiuser and parallel substream interferences respectively the system retains a low-PAPR transmitted signal and a low-complexity equalizer without any matrix inversion. At the basestation a multiuser receiver is derived which involves parallel FSOK despreading demapping and maximum likelihood decision rule to acquire M-ary modulation gain and frequency diversity gain. For higher link quality a multiple input single output FSOK uplink system can flexibly be configured. Simulation results are included to demonstrate that the proposed system achieves the low-PAPR property space-frequency diversity and M-ary modulation gain. Compared to the existing MC-CDMA and SC-FDMA systems the proposed system exhibits significant performance superiority. Keywords multi-carrier CDMA MC-CDMA frequency-shift orthogonal keying FSOK peak-to-average power ratio PAPR multiple input multiple output MIMO SC-FDMA 1. Introduction Currently low peak-to-average power ratio PAPR modulation schemes are highly recommended for uplink broadband wireless communications. Single-carrier frequency division multiple access SC-FDMA techniques 1-3 . interleaved distributed and localized SC-FDMA have been proposed to achieve the low-PAPR requirement. SC-FDMA systems with different subcarrier assignment schemes can preserve .