Shared amplitude weighted analog beam forming method applied to millimeter wave communication

Abstract

The invention discloses a shared amplitude weighted analog beam forming method applied to millimeter wave communication. The method comprises the following steps of: 1, reducing inter-beam interference by utilizing shared amplitude weighting on the basis of adjusting different beam orientations by utilizing a phase shifter matrix; 2, weighting the adjustable shared amplitude, and performing weightdesign by using an optimization method; and 3, for fixed shared amplitude weighting, performing spatial domain filtering by using a window function, and reducing the sidelobe level further. Accordingto the invention, the cost and the system overhead can be reduced, the beam forming can be realized only depending on the beam direction, and the analog beam forming can support multi-data stream transmission.

Description

technical field [0001] The invention belongs to the technical field of future 5G millimeter wave large-scale antenna array communication, and in particular relates to a design method for shared amplitude weighted analog beamforming. Background technique [0002] Future 5G communications require greater bandwidth, higher data rates and spectral efficiency. The millimeter-wave frequency band has huge unlicensed spectrum resources and is considered to be a promising choice in 5G communications; at the same time, large-scale antenna array technology can resist path loss by obtaining higher antenna gain; in addition, in order to increase antenna direction gain, improve Coverage capability, beamforming technology has received widespread attention. Beamforming technology is divided into analog domain beamforming and digital domain beamforming. In most cases, beamforming in the analog domain is implemented through a phase shifter network, which is low in cost, but only applicable ...

AI Technical Summary

Problems solved by technology

However, these schemes all have the disadvantages of high training overhead and high computational complexity, so most of them use channel reciprocity to complete complex channel estimation or beam training processes in the uplink, and then design downlink beamforming based on this

But in fact, due to the existence of various factors such as in-phase and quadrature imbalance, the radio frequency chain does not satisfy reciprocity in the uplink and downlink

In addition, due to the existence of frequency offset, limited precision feedback and other problems, channel acquisition will inevitably have errors, which will lead to a serious decline in hybrid beamforming performance

[0004] The beamforming method of the traditional analog domain constant-amplitude phase-shift network faces the problem of severely limited number of links caused by inter-link interference; all-digital implementation and hybrid beamforming methods are subject to cost, device supply chain and other reasons, making millimeter wave Communication systems face great challenges in practical application; beamforming methods are sensitive to channel (equivalent channel) estimation errors and require high system overhead, which limits the application of related beamforming techniques in the uplink

Images