Long-term evolution system self-adaptation frequency deviation precorrection method under environment of high-speed rail

Abstract

The invention discloses a long-term evolution system self-adaptation frequency deviation precorrection method under the environment of a high-speed rail. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is characterized by including the following steps: (1) distributing stations along railway by adopting the mode of a baseband processing unit (BBU) and a remote radio unit (RRU), transforming an uploading radio-frequency signal received by each RRU into a baseband signal and sending the baseband signal to the BBU, (2) conducting least squares (LS) channel estimation by the BBU according to the baseband signals sent by different RRUs based on an uploading reference signal, (3) calculating uploading frequency deviation of different user data correspondingly received by each RRU according to an LS estimated value on the reference signal. The long-term evolution system self-adaptation frequency deviation precorrection method under the environment of the high-speed rail is capable of increasing coverage area of single cell along the railway of long term evolution and LET-A system, reducing switchover and improving success rate of user access.

Description

technical field [0001] The present invention relates to a Doppler frequency offset pre-correction method applied in a high-speed rail environment, in particular to a 3GPP LTE (3GPP Long Term Evolution, long-term evolution of the third generation partnership project) application in a high-speed rail communication scenario and LTE-A system (advanced long-term evolution system, hereinafter collectively referred to as LTE system) adaptive frequency offset pre-correction method. Background technique [0002] The Long Term Evolution (LTE) project of the Universal Mobile Telecommunications System (UMTS) is the largest new technology research and development project initiated by 3GPP in recent years. The uplink and downlink of 3GPP LTE adopts single-carrier orthogonal frequency division multiple access SC-OFDMA and orthogonal frequency division multiple access OFDMA respectively. This orthogonal frequency division multiplexing method can greatly improve spectrum utilization, is sui...

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Problems solved by technology

[0007] Technical problem: The LTE system adaptive frequency offset pre-correction method in the high-speed rail environment proposed by the present invention is mainly to solve the problem of positive and negative Doppler frequency offsets at the receiving end when multiple RRUs are jointly covered, so as to improve the LTE frequency in the high-speed rail environment. Communication System Performance

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