A Low Complexity Code-aided Carrier Synchronization Algorithm

Yan  Hui; Tang  Fa-Jian; Zhang Zhong-Pei

doi:10.3724/SP.J.1146.2010.00017

Volume 32 Issue 12

Jan. 2011

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Yan Hui, Tang Fa-Jian, Zhang Zhong-Pei. A Low Complexity Code-aided Carrier Synchronization Algorithm[J]. Journal of Electronics & Information Technology, 2010, 32(12): 2959-2963. doi: 10.3724/SP.J.1146.2010.00017

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Yan Hui, Tang Fa-Jian, Zhang Zhong-Pei. A Low Complexity Code-aided Carrier Synchronization Algorithm[J]. Journal of Electronics & Information Technology, 2010, 32(12): 2959-2963. doi: 10.3724/SP.J.1146.2010.00017

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A Low Complexity Code-aided Carrier Synchronization Algorithm

doi: 10.3724/SP.J.1146.2010.00017 cstr: 32379.14.SP.J.1146.2010.00017

Received Date: 2010-01-05
Rev Recd Date: 2010-06-15
Publish Date: 2010-12-19

Abstract

Abstract

Considering the condition of low Signal to Noise Ratio (SNR), the Code-aided carrier recovery algorithm performs high computational complexity. Based on the analysis of the probability density function of posterior information, modified posterior information mean with three states and new Log-Likelihood Ratio (LLR) are proposed according a probability threshold that represents the information reliability. Then a new carrier synchronization algorithm is obtained when the new posterior information mean and log-likelihood ratio are separately applied into the expectation maximization and soft frequency sweep algorithm. There is a simplified expectation maximization algorithm and evaluation function. In last, the simulations by the Turbo code with 1/6 code rate verify that the new algorithm improves the performance of computational complexity, increases the synchronization range and achieves perfect synchronization with only 0.05dB loss when SNR exceeds -7.9 dB.
- Deep space communication,
- Low SNR,
- Carrier recovery,
- Expectation Maximization (EM) algorithm

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References(1)

References

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