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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:QIU Xin,SHA Xue-jun,MEI Lin.Performance analysis of hybrid carrier DS CDMA communication system[J].Journal of Harbin Institute Of Technology(New Series),2012,19(4):77-82.DOI:10.11916/j.issn.1005-9113.2012.04.013.
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Performance analysis of hybrid carrier DS CDMA communication system
Author NameAffiliation
QIU Xin Communication Research Center, Harbin Institute of Technology, Harbin 150001, China 
SHA Xue-jun Communication Research Center, Harbin Institute of Technology, Harbin 150001, China 
MEI Lin Communication Research Center, Harbin Institute of Technology, Harbin 150001, China 
Abstract:
A hybrid carrier (HC) DS CDMA communication system is proposed, combining 4-weighted fractional Fourier transform (4-WFRFT) with code division multiple access (CDMA) technique. The signals are modulated in a certain order fractional Fourier domain and transformed by 4-WFRFT to compose the hybrid carrier signals. In the time domain CDMA technique is adopted for multiple accesses and time diversity gain. Compared to orthogonal frequency division multiplexing (OFDM) system, in which Fourier transform is adopted, the signal energy in HC system is distributed on the time-frequency plane more evenly and symmetrically. Thus, 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. Moreover, the performances of the proposed system, such as peak-to-average power rate (PAPR) and security are also discussed in the paper.
Key words:  4-weighted fractional Fourier transform  code division multiple access  carrier scheme  selective channel
DOI:10.11916/j.issn.1005-9113.2012.04.013
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