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A Low-PAPR Differential Frequency Shift Orthogonal Keying Transceiver for Multi-Carrier Spread Spectrum System over High Mobility Multipath Channels

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Abstract

A new differential transceiver with a frequency-shift orthogonal keying (FSOK) technique is proposed for the multi-carrier spread spectrum (MC-SS) system over high mobility multipath fading channels. The design of the transceiver involves the following stages. First, the data stream is mapped into MPSK-FSOK symbols and spreaded by the frequency-shift orthogonal sequences. Second, the differential block encoder is exploited to combat the mobile channels. The Chu sequence is adapted for initial differential encoding, making the post-IFFT transmit signals with a low peak-to-average power ratio. Next, for the receiver, the maximum ratio combining technique is used for the block-based differential frequency-domain equalizer, which can overcome the multipath fading channel effect without requiring channel estimation. Finally, an efficient maximum likelihood despreading and demapping scheme is used to detect the modulation symbols. Furthermore, the differential MC-SS transceiver can be easily re-configured for a MISO differential MC-SS system with high link quality. Simulation results show that, under high mobility multipath channels, the proposed SISO differential MC-SS system can outperform the conventional MC-SS system. The proposed MISO differential MC-SS system with space-time diversity gain and M-ary modulation gain also exhibits excellent performance.

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Authors and Affiliations

  1. Department of Communication Engineering, Yuan Ze University, Chungli, Taoyuan, Taiwan, 32003, R.O.C.

    Juinn-Horng Deng, Jeng-Kuang Hwang & Shu-Min Liao

Authors
  1. Juinn-Horng Deng
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  2. Jeng-Kuang Hwang
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  3. Shu-Min Liao
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Correspondence to Juinn-Horng Deng.

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Deng, JH., Hwang, JK. & Liao, SM. A Low-PAPR Differential Frequency Shift Orthogonal Keying Transceiver for Multi-Carrier Spread Spectrum System over High Mobility Multipath Channels. Wireless Pers Commun 59, 607–624 (2011). https://doi.org/10.1007/s11277-010-9928-4

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  • DOI: https://doi.org/10.1007/s11277-010-9928-4

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