利用TCH序列进行同步、信道和噪声估计

2009 3rd International Conference on Signal Processing and Communication Systems Pub Date : 2009-10-30 DOI:10.1109/ICSPCS.2009.5306425

J. C. Silva, N. Souto, R. Dinis, P. Montezuma

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引用次数: 1

摘要

对TCH序列进行了码扩和信道编码的研究，但其本质是同步和信道估计。这是由于它们的性质是(几乎)正交于通过圆移位得到的所有序列。这个属性对于时间偏移同步(只有当两个序列对齐时才有一个明显的“峰值”)和色散信道估计(因为多径开关现在彼此正交)非常有用。除了使用TCH序列外，还使用了一个相等符号序列进行频率同步-这对于校正估计之间的相位偏移(特别是对于高偏移值)至关重要，从而允许后验信号处理。

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On the use of TCH sequences for synchronization, channel and noise estimation

TCH sequences have been studied for code-spreading and channel coding, but its true essence if that of synchronization and channel estimation. This is due to their property of being (almost) orthogonal to all sequences obtained via circular shifts. This property is extremely useful for time-offset synchronization (there is a distinct “peak” only when both sequences are aligned), and for dispersive channel-estimation (since the multipath-taps are now orthogonal to each other). Alongside the use of the TCH sequences, a sequence of equal symbols is also employed for frequency-synchronization — essential for correcting the phase offset between estimates (especially for high offset values), and thus allowing for the posterior signal-processing.

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2009 3rd International Conference on Signal Processing and Communication Systems

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