Iterative Carrier Recovery Based on Soft Decision Metrics of LDPC Decoding

Bao Jian-rong; Zhan Ya-feng; Lu Jian-hua

doi:10.3724/SP.J.1146.2008.01321

Volume 31 Issue 10

Dec. 2010

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Bao Jian-rong, Zhan Ya-feng, Lu Jian-hua. Iterative Carrier Recovery Based on Soft Decision Metrics of LDPC Decoding[J]. Journal of Electronics & Information Technology, 2009, 31(10): 2416-2420. doi: 10.3724/SP.J.1146.2008.01321

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Bao Jian-rong, Zhan Ya-feng, Lu Jian-hua. Iterative Carrier Recovery Based on Soft Decision Metrics of LDPC Decoding[J]. Journal of Electronics & Information Technology, 2009, 31(10): 2416-2420. doi: 10.3724/SP.J.1146.2008.01321

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Iterative Carrier Recovery Based on Soft Decision Metrics of LDPC Decoding

doi: 10.3724/SP.J.1146.2008.01321

Received Date: 2008-10-14
Rev Recd Date: 2009-03-12
Publish Date: 2009-10-19

Abstract

Abstract

It is difficult to recovery carrier at rather low SNR (2 dB). An iterative carrier recovery via soft decision metrics of LDPC decoding is proposed. By maximizing the sum of the absolute value of the soft decision metrics of LDPC decoding with search window aided simplex algorithm, it can obtain accurate carrier estimate which will be compensated. Meanwhile, it can be combined with the Costas loop with LDPC decoding feedback to eliminate the residual carrier offsets. Simulation results indicate that it can overcome the problems of phase ambiguity, cycle slip and so on, and the performance of the QPSK system with it under carrier offsets is just within 0.1 dB of the ideal performance at the cost of some more computation complexity.

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References

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