Channel Estimation Method for Single Carrier Frequency Domain Equalization in Low Energy Diffuse Multipath Channel

Abstract

The invention discloses a channel estimation method for single carrier frequency domain equalization under a low energy dispersion multipath channel. A problem of channel estimation performance loss of an existing single carrier equalization system under a low energy dispersion multipath environment can be improved effectively by using the channel estimation method disclosed by the invention. Segmentation is carried out through setting a value of an approximate signal to noise ratio, different numbers of useful signal paths and different threshold values are selected in different signal to noise ratio intervals, and then time domain noise reduction processing of channel estimation is carried out. The channel estimation method disclosed by the invention is not only applicable to extracting the useful signal paths accurately in a high signal to noise ratio environment. In addition, when most of the useful signal paths are possibly submerged in noises and cannot be distinguished in a low energy multipath channel environment, the low energy multipath channel environment is divided into a high signal to noise ratio interval, a middle signal to noise ratio interval and a low signal to noise ratio interval by adopting the method, the useful signal paths can also be extracted accurately, and the performance of channel estimation is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication channel estimation, in particular to a channel estimation method for single-carrier frequency-domain equalization under low-energy dispersive multipath channels. Background technique [0002] In wireless communication, when the signal transmitted by the transmitting end is transmitted to the receiving end, the signal received by the receiving end includes, in addition to the direct wave and ground reflected wave of the transmitted signal, there are various obstacles caused by the propagation process. The scattered waves, that is, the multipath effect. Due to the multipath effect, the signal received by the receiving end will generate intersymbol interference, which is not conducive to the receiving end recovering the signal at the time of transmission according to the received signal. OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) and ...

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Problems solved by technology

[0006] In view of this, the present invention provides a channel estimation method for single-carrier frequency-domain equalization in a low-energy dispersion multipath channel, which can effectively improve the channel estimation performance loss of the existing single-carrier equalization system in a low-energy dispersion multipath environment problem, through the time-domain noise reduction processing based on the number of useful signal paths η and the threshold value β, the method provided by the present invention can simultaneously satisfy the channel estimation under the conditions of high SNR and low SNR

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