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Carrier Synchronization for Very Low SNR

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摘要 The Turbo decoding performance will suffer serious degradation under low signal-to-noise ratios(SNR)conditions for the reason of residual frequency and phase offset in the carrier.In this paper,an improved residual carrier frequency offset estimation algorithm based on a priori probability aided(APPA)phase estimation is proposed.A carrier synchronization loop that combines the iterative turbo decoder and the phase estimator together is constructed,where the extrinsic information obtained from the Turbo decoder is used to aid an iterative phase estimation process.The simulation results show that the algorithm performs successfully under very low SNR conditions(for example,less than-7.4 dB)with large frequency offset and phase error and the performance of this algorithm is very close to the optimally synchronized system.
作者 Jun-Hui Xu Zhao Wang Zhong-Jie Gao Zhong-Pei Zhang
机构地区 National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China
出处 《Journal of Electronic Science and Technology》 CAS 2010年第2期103-107,共5页 电子科技学刊(英文版)
基金 supported by the National Natural Science Foundation of China under Grant No.60602008 National 863 Programs under Grant No.2007AA01Z299,2006AA01Z269
关键词 Index Terms-Carrier synchronization frequency offset phase error signal-to-noise ratios(SNR)
分类号 TN914.3 [电子电信—通信与信息系统] P631.443 [天文地球—地质矿产勘探]
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参考文献10

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二级参考文献23

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共引文献8

Journal of Electronic Science and Technology
2010年 第2期

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