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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:Ming-Duo Liu,Li-Li Guo,Hong-Lei Li.BER Performance of Soft Decision Modulations Based on PCSS System[J].Journal of Harbin Institute Of Technology(New Series),2013,20(2):22-26.DOI:10.11916/j.issn.1005-9113.2013.02.005.
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BER Performance of Soft Decision Modulations Based on PCSS System
Author NameAffiliation
Ming-Duo Liu College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China 
Li-Li Guo College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China 
Hong-Lei Li The 61769 Unit of PLA, Harbin 150001, China 
Abstract:
Recently, soft decision modulations become the highlight of parallel combinatory spread spectrum (PCSS) system. Existing soft decision BPSK and APK modulations are given and compared in the thesis. In order to apply soft decision QPSK modulation based on PCSS system, the correlation of superposition PN sequences is discussed. A weighted summation algorithm is adopted in QPSK demodulation to recover the whole orthogonal correlation of the superposition sequences; meanwhile the bit error rate of weighting soft decision QPSK modulation is simulated. The simulation results show that the bit error rate performance of proposed soft decision QPSK modulation based on PCSS system is better than that of hard decision modulation. The method proposed can be widely adopted in engineering application.
Key words:  parallel combinatory spread spectrum system  soft decision modulations  correlation of superposition PN sequences
DOI：10.11916/j.issn.1005-9113.2013.02.005
Clc Number:TN91
Fund:

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