Carrier-frequency estimation for transmissions over selective channels
Carrier-frequency estimation for transmissions over selective channels
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DOI：
10.1109/26.870025
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发表时间：
2000-09
期刊：
影响因子：
--
通讯作者：
M. Morelli;U. Mengali
中科院分区：
文献类型：
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作者：
M. Morelli;U. Mengali
本文研究了频率选择性信道中突发传输的载频估计问题。提出了三种基于已知训练序列的估计方案。第一种方案使用任意序列，并提供载波频率和信道响应的联合最大似然(ML)估计。它的实现复杂度相对较高，但精度达到了Cramer-Rao界。第二种方案仍然基于最大似然准则，但训练序列是周期性的，这有助于减少计算量。第三种方案也使用周期序列，但其结构来自启发式推理。通过理论分析和仿真对三种方案的性能进行了评估。
This paper deals with carrier-frequency estimation for burst transmissions over frequency-selective channels. Three estimation schemes are proposed, all based on the use of known training sequences. The first scheme employs an arbitrary sequence and provides joint maximum-likelihood (ML) estimates of the carrier frequency and the channel response. Its implementation complexity is relatively high but its accuracy achieves the Cramer-Rao bound. The second scheme is still based on the ML criterion, but the training sequence is periodic, which helps to reduce the computational load. The third scheme also employs periodic sequences, but its structure comes from heuristic reasoning. Theoretical analysis and simulations are employed to assess the performance of the three schemes.