6th International ICST Conference on Communications and Networking in China

Research Article

Performance of Hybrid Carrier DS CDMA Communication System

  • @INPROCEEDINGS{10.1109/ChinaCom.2011.6158143,
        author={Xin Qiu and Xuejun Sha and Lin Mei},
        title={Performance of Hybrid Carrier DS CDMA Communication System},
        proceedings={6th International ICST Conference on Communications and Networking in China},
        publisher={IEEE},
        proceedings_a={CHINACOM},
        year={2012},
        month={3},
        keywords={4-weighted fractional fourier transform code division multiple access carrier scheme selective channel},
        doi={10.1109/ChinaCom.2011.6158143}
    }
    
  • Xin Qiu
    Xuejun Sha
    Lin Mei
    Year: 2012
    Performance of Hybrid Carrier DS CDMA Communication System
    CHINACOM
    IEEE
    DOI: 10.1109/ChinaCom.2011.6158143
Xin Qiu1, Xuejun Sha1,*, Lin Mei1
  • 1: Communication Research Center, Harbin Institute of Technology
*Contact email: shaxuejun@hit.edu.cn

Abstract

This paper proposes a hybrid carrier DS CDMA communication system, combining 4-weighted fractional Fourier transform (4-WFRFT) with code division multiple access (CDMA). The signals are modulated in an order fractional domain and transformed by 4-WFRFT. In the time domain CDMA technique is adopted for multiple accesses and time diversity gain. The bit energy in 4-WFRFT system is distributed on the time-frequency plane more evenly and symmetrically, compared to orthogonal frequency division multiplexing (OFDM) system, in which Fourier transform is used. When there is a deep fading notch or single-frequency interference in the channel, the proposed method can split the interference to a broader range in order to reduce the influence, resulting in the better system performance.