Multi-antenna millimeter-wave channel estimation method for quantized receiving signal

Abstract

The invention discloses a channel estimation method based on a minimum mean square error for a quantized millimeter-wave multi-antenna channel. According to the scheme, the channel estimation based onthe minimum mean square error is realized under the condition that a receiving signal on a receiving end is quantized, and the estimation method utilizes an EM algorithm at the same time, so that a channel estimation algorithm does not depend on the statistical information of an accurate known channel. According to the method, the influence of the quantization operation of the receiving end on channel estimation is fully considered, and mathematical modeling is carried out on the quantized signal. Only a probability model obeyed by the known channel is needed, and joint estimation of the channel and the parameters of the probability model can be simultaneously realized by utilizing the proposed iterative algorithm. The method has the advantages that the statistical information of the channel does not need to be known accurately, only the obeyed probability distribution type needs to be known, and then the joint estimation of the probability distribution parameters and the channel is realized through the EM algorithm, so that the channel estimation scheme provided by the invention has a wide application scene and strong robustness, and thus the stability of a wireless communicationsystem is guaranteed.

Description

technical field [0001] The invention designs a wireless communication and signal processing system, and in particular relates to a wireless communication system suitable for an environment of uncertain channel information. Background technique [0002] Millimeter wave band wireless communication can effectively solve the dilemma of current wireless communication spectrum scarcity, and has become a research hotspot in future wireless communication. The wide bandwidth of the unplanned spectrum in the millimeter wave band can greatly improve the network capacity of the entire wireless network, especially when combined with large-scale antenna technology. However, the millimeter-wave band is different from the traditional low-frequency band. Generally speaking, signal transmission in the millimeter-wave band requires a wireless communication receiver to have a higher sampling frequency spectrum to obtain undistorted received signals. However, as the sampled spectrum increases, ...

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Problems solved by technology

[0004] At the same time, it is generally difficult to obtain accurate statistics of the channel. If channel statistics are estimated at the same time as channel estimation, it is another important problem in mmWave communication channel estimation.

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