Closed loop macro diversity method based on disturbance theory in coordinated multi-point system

Abstract

The invention relates to the field of wireless communication and discloses a closed loop macro diversity method based on the disturbance theory in a coordinated multi-point (CoMP) system. The closed loop macro diversity method comprises the following steps: a plurality of base stations serve one user together; under the condition that the channel information and the data information are completelyshared, each base station respectively carries out the design of precoding, and then, a base station controller is used for adjusting the phase position of the precoding vector; and the higher received signal combining gain is obtained by adjusting the phase position of each row of the right singularity matrix of the channel. The channel state information (CSI) can be obtained by up-link feedback(FDD system) or direct channel estimation (TDD system). Compared with the prior art, the invention has higher frequency spectrum efficiency and better interruption probability performance and can notincrease the extra feedback cost and the data sharing cost.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a closed-loop macro-diversity communication technology based on the disturbance principle. Background technique [0002] With the rapid growth of wireless communication requirements, efficient use of spectrum resources has become increasingly important. Currently, mobile communication systems use cellular wireless systems to effectively utilize limited spectrum resources. 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 of point-to-point multi-antenna transmission (MIMO) technol...

AI Technical Summary

Problems solved by technology

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, such as: narrow cell coverage, coverage blind areas or blind spots; due to the near-far effect The poor channel conditions with the users at the edge of the cell make the transmission rate not high; in the case of crowded cells, it is difficult to balance the flow of adjacent cells, and everything is centered on the base station, and the complexity of the base station is high; it is highly dependent on the base station and is limited by the number of antennas. Limitation, low user diversity (SER and QoS are affected), etc.

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