| 极低信噪比环境下的载波同步算法研究 |
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| 引用本文： | 徐俊辉,陈炜,张忠培.极低信噪比环境下的载波同步算法研究[J].通信技术,2009,42(12):27-28. |
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| 作者姓名： | 徐俊辉 陈炜 张忠培 |
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| 作者单位： | 电子科技大学,抗干扰国家重点实验室,四川,成都,610054 |
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| 基金项目： | 国家高技术发展计划(863计划)课题"高效信道编码与广义空时码的联合优化设计研究" |
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| 摘 要： | 在极低信噪比环境下,需要使用纠错能力强的编码比如Turbo码,但Turbo码系统的缺点是要求近乎理想的载波同步。然而,在极低信噪比环境下,Turbo编码系统的同步是具有挑战性的工作。文章提出了一种基于最大均方软输出的扫频和面向判决载波同步相结合的载波同步算法。仿真结果表明,该算法能捕获较大的频偏和相偏,且在极低信噪比环境下,仍能正常工作,其性能非常接近理想同步条件下的性能。
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| 关 键 词： | 最大均方软输出 面向判决载波同步 极低信噪比 |
Research on Carrier Recovery for Very Low SNR |
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| XU Jun-hui,CHEN Wei,ZHANG Zhong-pei.Research on Carrier Recovery for Very Low SNR[J].Communications Technology,2009,42(12):27-28. |
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| Authors: | XU Jun-hui CHEN Wei ZHANG Zhong-pei |
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| Affiliation: | (State Key Laboratory of Communications, University of Electronic Science and Technology of China, Chengdu Sichuan 610054, China) |
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| Abstract: | Strong error correcting codes（such as Turbo codes） need to be introduced at very low SNR values,the disadvantage of Turbo code system is that it requires almost ideal carrier synchronization. However,the synchronization for Turbo-encoded system is a challenging task since the receiver usually operates at very low SNR values. In this paper,a carrier recovery algorithm in combination of with frequency sweep and DDCS and based on M2S2O is proposed. The simulation results indicate that this algorithm can acquire a greater frequency offset and phase offset, can also work normally at very low SNR values, and its performance is very close to the performance of ideal carrier synchronization. |
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| Keywords: | M2S2O DDCS very low SNR |
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