A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code

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

doi:10.3724/SP.J.1146.2010.00352

Volume 33 Issue 2

Mar. 2011

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Yan Hui, Tang Fa-Jian, Zhang Zhong-Pei. A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code[J]. Journal of Electronics & Information Technology, 2011, 33(2): 470-474. doi: 10.3724/SP.J.1146.2010.00352

Citation:

Yan Hui, Tang Fa-Jian, Zhang Zhong-Pei. A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code[J]. Journal of Electronics & Information Technology, 2011, 33(2): 470-474. doi: 10.3724/SP.J.1146.2010.00352

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A Joint Assisted Carrier Synchronization Algorithm with Code and Pilot Based on Low Rate LDPC Code

doi: 10.3724/SP.J.1146.2010.00352

Received Date: 2010-04-06
Rev Recd Date: 2010-10-27
Publish Date: 2011-02-19

Abstract

Abstract

Considering that the code-aided and data-aided carrier recovery algorithms perform small synchronization range and big inaccuracy in low Signal to Noise Ratio (SNR) deep space communication systems, a joint assisted carrier synchronization algorithm with code and pilot is proposed. First a coarse synchronization algorithm with optimal pilot placement is constructed based on the sum of autocorrelation function of the pilots, whose frequency estimator can approximate Cramer-Rao Bound. The impact mechanism of pilot type on the trade-off between range and accuracy of estimation is analyzed. And then, a modified expectation maximization fine carrier synchronization is got with means of inserting pilot symbols and adding an integrator. Finally the simulations with the LDPC-Hadamard code with rate 1/12 verify that the new algorithm can increase synchronization range and improve accuracy, and achieve perfect synchronization with a certain amount of pilots at very low Signal to Noise Ratio.
- Deep space communications,
- Carrier synchronization,
- Code-Aided (CA),
- LDPC-Hadamard code

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References(1)

References

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