A Coordinated Beamforming Method Based on Maximum Ratio Combining Receive Vector Estimation

Abstract

The invention provides a maximum ratio combining receiving vector estimation-based coordinated beamforming method. The method comprises the following steps that each cooperation base station estimates a receiving beamforming vector of a service user in a maximum ratio combining way according to known channel status information and a transmitting beamforming vector at the previous moment, and receiving beamforming vector estimated values of respective service users which are shared between the cooperation base stations; and each cooperation base station designs a transmitting beamforming vector at a current moment by utilizing the beamforming vector estimated values received by sharing and taking the maximum signal-to-leakage-and-noise ratio (SLNR) as a criterion. According to the method, a small amount of information is shared between the cooperation base stations to obtain receiving beamforming vector estimated values of interference users, and then transmitting beamforming vectors which are designed based on the criterion of the maximum SLNR according to the estimated values; and compared with the conventional maximum SLNR criterion-based coordinated beamforming scheme, the method has the advantages that the performance is remarkably improved, the system overhead is lower, and the method can be implemented in a distributed way at each cooperation base station.

Description

technical field [0001] The invention belongs to the technical field of coordinated multipoint transmission in a wireless communication system, and relates to a coordinated beamforming method based on estimating a receiving beamforming vector. Background technique [0002] The joint processing technology in coordinated multi-point transmission needs to share data and channel state information among the nodes participating in the cooperation. Although it can maximize system performance, it has high requirements on the throughput and delay of the backhaul link (Backhaul) , and has strict requirements on symbol synchronization, and it is difficult to implement under the existing network architecture and standards, so it is difficult to implement. Coordinated beamforming is an important branch of coordinated multipoint transmission technology. It provides a compromise between Backhaul overhead and system performance. Compared with joint processing, coordinated beamforming only ne...

AI Technical Summary

Problems solved by technology

The above schemes can be divided into two types: the coordinated beamforming scheme considering the receiving vector and the coordinated beamforming scheme not considering the receiving vector. The performance of the scheme considering the receiving vector is significantly improved compared with the scheme not considering the receiving vector. But the overhead of feedback overhead and information sharing is much larger than the overhead of the scheme without considering the receiving vector

[0004] The traditional transmit beamforming vector design scheme based on the SLNR criterion can be implemented in a distributed manner at each base station, but because this design method does not consider the impact of the receive vector on performance, the system performance is poor

If the reception vector of each base station is considered, all cooperative base stations need to share all the channel state information, which will lead to a large overhead of the X2 interface, which is relatively difficult to implement

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