BER Performance of Soft Decision Modulations Based on PCSS System
Ming-Duo Liu 1, Li-Li Guo 1, Hong-Lei Li 2
(1. College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China; 2. 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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BER Performance of Soft Decision Modulations Based on PCSS System
本站小编 哈尔滨工业大学/2019-10-24
相关话题/BER Performance Soft Decision Modulations
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