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Correlation-Based LTI Channel Estimation for Multi-Wavelength Optical Scattering Communication

机译：多波长光散射通信的基于相关性的LTI信道估计

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摘要

Strong correlation of link gains over multiple wavelengths has been demonstrated in non-line-of-sight optical wireless scattering communication. In this paper, we further demonstrate that the channel impulse responses for different wavelengths are also strongly correlated. Thus, a novel channel estimation method based on such correlation over multiple wavelengths is proposed, where only certain reference wavelengths are assigned pilot signal. On each channel with assigned pilot signal, we adopt an improved least-squares channel estimation method to estimate the tap parameters and the tap length (or the number of taps). The channel tap coefficients on other wavelengths can be estimated based on the correlation. Under the proposed channel estimation, the channel estimation accuracy can be improved as shown by the simulations. Moreover, under the same total channel estimation overhead, the accuracy of the proposed channel estimation first increases and then decreases with the number of reference wavelengths.
机译：在非视线光学无线散射通信中，已经证明了在多个波长上的链路增益的强烈相关性。在本文中，我们进一步证明对不同波长的信道脉冲响应也强烈相关。因此，提出了一种基于多个波长的这种相关性的新型信道估计方法，其中仅分配了某些参考波长的导频信号。在具有指定的导频信号的每个通道上，我们采用改进的最小二乘信道估计方法来估计抽头参数和抽头长度（或抽头数）。可以基于相关性估计其他波长上的信道抽头系数。在所提出的信道估计下，可以通过模拟所示提高信道估计精度。此外，在相同的总信道估计开销下，所提出的信道估计的准确性首先增加，然后用参考波长的数量减小。

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