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A Novel Multi-carrier Order Division Multi-access Communication System Based on TDCS with Fractional Fourier Transform Scheme

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Abstract

In this paper, we propose a novel fractional Fourier transform (FrFT) based multi-carrier order division multi-access communication system, in which each user is uniquely identified by an FrFT order. Transform domain communication system (TDCS) with FrFT scheme is also proposed to synthesize the wide-band baseband waveforms in all FrFT domains with different users’ FrFT orders, which enhances the interference avoidance capability of this system under most of interference. Therefore, multiple independent data streams can be transmitted by using FrFT–OFDM in the same time and different FrFT domains. However, chirp bases, as the new kind of carriers with different modulated rates, are merely mutually approximately orthogonal. There is a problem of energy leakage between multiple chirp carriers, which possibly causes the multiple chirp carriers inter-shielding to influence the FrFT–OFDM demodulation performance. An efficient allocation algorithm of multiple chirp carriers by presetting the carrier parameters is proposed to solve this problem. Based on MC-CDMA, a variable bit rate system structure is proposed for TDCS with FrFT scheme under different channel environments. In order to simplify the process of modulation and demodulation of TDCS with FrFT scheme, a whole new cyclic shift key modulation mode in FrFT domain is also proposed. Both theories and simulations confirm strictly the validity of the proposed system.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 61331021 and 61201354) and Doctoral Fund of Ministry of Education of China (No. 20121101130001) and the Cultivation and Development Engineering of Science and Technology Innovation Base (No. Z131101002813088) and Open Research fund Program of Key Lab. for Spacecraft TT&C and Communication, Ministry of Education, China.

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Authors and Affiliations

  1. School of Information and Electronics, Beijing Institute of Technology, Beijing, 100081, China

    Zeyi Yang, Ran Tao, Yue Wang & Teng Wang

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  1. Zeyi Yang
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  2. Ran Tao
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  3. Yue Wang
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  4. Teng Wang
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Correspondence to Ran Tao.

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Yang, Z., Tao, R., Wang, Y. et al. A Novel Multi-carrier Order Division Multi-access Communication System Based on TDCS with Fractional Fourier Transform Scheme. Wireless Pers Commun 79, 1301–1320 (2014). https://doi.org/10.1007/s11277-014-1931-8

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  • DOI: https://doi.org/10.1007/s11277-014-1931-8

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