MIMO communication system based on relay and communication method thereof

Abstract

The present invention discloses a multi-input multi-output communication system based on relay and a communication method thereof, and belongs to the field of wireless communication. The structure of the invention comprises a transmitter, a forwarding device and a receiver. The forwarding device is composed of relays. Each relay equally comprises a phase rotator and an amplitude amplifier. The communication method comprises the following steps: executing preprocessing to the signal to be transmitted by the transmitter for obtaining the column vector signal before transmission; amplifying the received signal by the amplitude amplifier of each relay in the forwarding device, adjusting the phase of received signal by the phase rotator; and executing amplitude weighting and phase rotating to the duplicate copies of a plurality of received channel by two maximal ratio combiners in the receiver. The system and method of the invention have higher spectrum efficiency and better probability capability. Each replay independently processes and forwards the received signal. The complexity and feedback expenditure of cooperative processing are reduced.

Description

technical field [0001] The invention relates to a multiple-input multiple-output communication system, in particular to a relay-based multiple-input multiple-output communication system and a communication method thereof, belonging to the field of wireless communication. Background technique [0002] Multiple Input Multiple Output (MIMO) communication technology has been fully developed in recent years. It is an effective way to use space resources to achieve high-speed link transmission, which can significantly increase the transmission rate and reliability of the communication system without adding additional spectrum and power, and is recognized as the key to the next generation of mobile communications One of the techniques. The research on the point-to-point multi-antenna transmission technology has become increasingly mature. It can effectively improve the effectiveness of spectrum efficiency, link reliability and power utilization through spatial multiplexing gain, d...

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Problems solved by technology

[0003] However, with the improvement of communication requirements, such as high speed, high quality of service (QoS) requirements, high coverage, etc., traditional MIMO technology shows many defects: the coverage of the cell is narrow, and there are coverage blind spots or blind spots; due to the near-far effect and the cell The channel conditions of edge users are poor, so that the transmission rate is not high; in the case of congested cells, it is difficult to balance the flow of adjacent cells. low user diversity

Currently, there is no good implementation

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