低信噪比下非数据辅助的OFDM系统信道阶数和噪声方差的估计

王东; 赵加祥; 喻丽红

doi:10.11999/JEIT150599

低信噪比下非数据辅助的OFDM系统信道阶数和噪声方差的估计

doi: 10.11999/JEIT150599

1.
(南开大学计算机与控制工程学院天津 300071) ②(南开大学电子信息与光学工程学院天津 300071)

基金项目:

天津市应用基础与前沿技术研究计划(14JCYBJC16100)

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- 被引次数: 0
出版历程
- 收稿日期: 2015-05-21
- 修回日期: 2015-11-04
- 刊出日期: 2016-02-19

The Non-data-aided Channel Order and Noise VarianceEstimation in the Low SNR Region of OFDM Signals

1.
(College of Computer and Control Engineering, Nankai University, Tianjin 300071, China)
2.
(College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China)

Funds:

Natural Science Foundation of Tianjin (14JCYBJC16100)

摘要

摘要: 在低信噪比情况下，该文提出一种新的针对正交频分复用(OFDM)系统信道阶数和噪声方差的非数据辅助(NDA)估计算法。算法中应用了一种新的基于联合极大几何均值(MGM)的代价函数。新的代价函数不仅利用了循环前缀(CP)冗余性，同时也利用了信道记忆性。对比只利用了CP的方法，该算法可以在低信噪比情况下更准确地估计信道阶数和噪声方差。仿真结果表明，在低信噪比情况下，该算法针对信道阶数的估计得到约10 dB的信噪比增益；同时，对噪声方差的估计，该算法显著提高了估计精度，抑制了信噪比20 dB以下估计性能恶化的现象。
- 正交频分复用 /
- 信道阶数和噪声方差估计 /
- 低信噪比 /
- 非数据辅助 /
- 联合极大几何均值
Abstract: This paper proposes a new Non-Data-Aided (NDA) scheme to estimate the channel order and noise variance in the low Signal to Noise Ratio (SNR) region of Orthogonal Frequency Division Multiplexing (OFDM) signals. In this scheme, a new cost function is derived based on the joint Maximum Geometric Mean (MGM) which relies on both the Cyclic Prefix (CP) redundancy and channel memory. Compared with the schemes which only rely on the CP, more accurate estimations of channel order and noise variance can be obtained from this joint MGM cost function. Simulation results show that the proposed channel order estimator gets approximately 10 dB SNR gain in the low SNR region. Meanwhile, the proposed noise variance estimator outperforms significantly the other existing NDA algorithms, and suppresses the performance deterioration when SNR below 20 dB.
- OFDM /
- Channel order and noise variance estimation /
- Low SNR /
- Non-Data-Aided (NDA) /
- Joint Maximum Geometric Mean (MGM)

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