Mobile relay receiving method and device under multi-radio-remote-unit (RRU) scene of high-speed railway

Abstract

The invention discloses a mobile relay receiving method and device under a multi-radio-remote-unit (RRU) scene of a high-speed railway, and mainly solves the problem of Doppler frequency offset deterioration of the relay receiving performance, which is caused by high-speed movement. The receiving method comprises the following steps: (1) receiving a signal; (2) preprocessing; (3) estimating a direction of arrival (DOA); (4) calculating a wave beam forming coefficient; (5) separating the signal; (6) eliminating the influence of frequency offset; (7) eliminating the influence of a channel; (8) combining; and (9) post-processing. The receiving device comprises an array antenna receiving module, a preprocessing module, a DOA estimation module; a signal separation module, a post-processing module and a signal combination processing module. By using the receiving method and the receiving device, the influence caused by different Doppler frequency offsets during mobile relay receiving can be eliminated; and the method and the device are applicable to the signal receiving process of a wireless transmission system such as a long-term evolution (LTE) system and the like under the multi-RRU scene of the high-speed railway.

Description

technical field [0001] The present invention belongs to the technical field of communication, and further relates to a high-speed railway multi-radio remote module RRU in an OFDM / OFDMA (Orthogonal Frequency Division Multiplexing / Orthogonal Frequency Division Multiplexing Access) system A mobile relay (Relay) receiving method and device in a (Radio Remote Unit) scenario. The invention can be used in the signal receiving and processing process of the mobile relay or user terminal of wireless transmission systems such as LTE (Long Term Evolution) under the high-speed railway, so as to realize high-quality signal receiving. Background technique [0002] With the continuous construction, opening and use of high-speed railways, the new generation of mobile communication systems needs to carry out high-speed information transmission with high-speed mobile users. Compared with communication in a static state or a low-speed state, high-speed information transmission in a high-speed ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that: since the Relay received signal in the multi-RRU scenario has multiple Doppler frequency offsets with different polarities, the receiving processing scheme directly performs the time-domain composite signal in the third step. Frequency offset estimation and compensation operations cannot effectively estimate and compensate each frequency offset value in the received signal, and the residual frequency offset will cause great interference to the subsequent processing of the signal, resulting in serious deterioration of system performance

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