Method for suppressing Doppler spread in high-speed mobile environment

Abstract

The invention discloses a method for suppressing Doppler spread in a high-speed mobile environment. The problem of performance deterioration of a receiver in a high-speed mobile environment cannot be solved essentially in the prior art. The method includes constructing base vectors of space of each orthogonal angular domain; projecting received signals in the orthogonal angular domains; performing equivalent Doppler estimation on the orthogonal angular domains; compensating for the equivalent Doppler estimation on the orthogonal angular domains; and estimating channels on the orthogonal angular domains, demodulating signals on signals in the space of each orthogonal angular domain and performing maximum-ratio combining to suppress the Doppler spread. The method has the advantages that the redundancy in transmission of the data on the wireless channels can be reduced, and calculation is lowered as compared with the traditional method for suppressing Doppler spread in a high-speed mobile environment.

Description

technical field [0001] The invention relates to the design of a receiving system in a multi-antenna environment, in particular to a method for suppressing Doppler expansion in a high-speed mobile environment. Background technique [0002] With the continuous development and expansion of mobile communication applications, in some special occasions (such as high-speed railways), it is required to achieve high-speed data transmission in the case of fast movement. Poor Doppler expansion occurs when moving at high speed. There are many reflectors in the wireless channel, and the signal sent by the base station reaches the receiving end through the wireless channel, which will produce multipath effect. When there is a relative displacement between the communication receiving and receiving ends, since the propagation path of each path changes, the phase of each path also changes at the receiving end. At this time, the phases of these paths of the composite equivalent path will cha...

AI Technical Summary

Problems solved by technology

However, these methods solve the Doppler spread problem based on the known multipath time-varying channel parameters, and do not consider the complexity of channel estimation.

In addition, when the multipath time-varying channel parameters are known, the complexity of the demodulation and detection algorithms is still high

However, considering the complexity of channel statistical characteristics and the influence of Doppler spread, many existing methods cannot essentially solve the problem of receiver performance degradation in high-speed mobile environments.

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