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arXiv 1612.04058cs.ITmath.IT
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光无线散射通信中连续波形短间隔采样下的信号检测

Signal Detection under Short-Interval Sampling of Continuous Waveforms for Optical Wireless Scattering Communication

Difan Zou, Chen Gong, Zhengyuan Xu

摘要:

在光无线散射通信中,接收信号在每个符号间隔内被光电倍增管(PMT)捕获,然后通过非常短但有限的间隔采样。所得样本形成用于符号检测的信号向量。研究了这种处理系统的传输速率的上界和下界。结果表明,当热噪声和散粒噪声方差趋于零时,两个边界之间的差距趋于零。最大后验概率(MAP)信号检测和低计算复杂性接收机推导下分段多项式近似。同时,对基于门限的信号检测进行了研究,提出了基于误检概率和KL距离的门限选择准则。对于后者,它示出的KL距离是不敏感的阈值选择的小镜头和热噪声的方差,因此,阈值可以选择在一个很宽的范围内没有显着的损失,从最佳KL距离。通过数值计算结果,对传输速率界、信号检测和门限选择方法的性能进行了评估。

英文摘要:

In optical wireless scattering communication, received signal in each symbol interval is captured by a photomultiplier tube (PMT) and then sampled through very short but finite interval sampling. The resulting samples form a signal vector for symbol detection. The upper and lower bounds on transmission rate of such a processing system are studied. It is shown that the gap between two bounds approaches zero as the thermal noise and shot noise variances approach zero. The maximum a posteriori (MAP) signal detection is performed and a low computational complexity receiver is derived under piecewise polynomial approximation. Meanwhile, the threshold based signal detection is also studied, where two threshold selection rules are proposed based on the detection error probability and the Kullback-Leibler (KL) distance. For the latter, it is shown that the KL distance is not sensitive to the threshold selection for small shot and thermal noise variances, and thus the threshold can be selected among a wide range without significant loss from the optimal KL distance. The performances of the transmission rate bounds, the signal detection, and the threshold selection approaches are evaluated by the numerical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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