A Switching Analog Beamforming System Subject to Independent Power Constraints

Abstract

The invention provides an on-off analog beamforming system constrained by independent power. The on-off analog beamforming system comprises a transmitting end radio frequency chain, a radio frequency switch assembly and a receiving end radio frequency chain, wherein the transmitting end radio frequency chain is connected with an input end of the radio frequency switch assembly; an output end of the radio frequency switch assembly is connected with the receiving end radio frequency chain; the radio frequency switch assembly comprises N transmitting radio frequency switches and N transmitting radio frequency antennas; the radio frequency switch assembly selects one radio frequency switch to serve as a receiving radio frequency switch to realize point-to-point transmission, and controls the radio frequency on-off state of the radio frequency switch assembly according to channel information in order to maximize a received signal-to-noise ratio; and the transmitting power of each transmitting radio frequency antenna of the radio frequency switch assembly is constrained independently by the transmitting power of a transmitter. Through adoption of the on-off analog beamforming system constrained by the independent power, an on-off analog beamforming gain is realized by an analog switch; all the selected radio frequency antennas are directly connected to corresponding radio frequency chains; and a complete multiplexing gain and all diversity gains can be realized.

Description

technical field [0001] The present invention relates to an analog beamforming system, in particular to a switching analog beamforming system subject to independent power constraints. Background technique [0002] Among the potential technologies for future 5G, massive multiple-input multiple-output (MIMO) has been shown to be able to increase the spectral efficiency of a system several times. A typical massive MIMO system is cellular communication, where a base station (BS) is equipped with a large number of antennas to serve mobile users. Furthermore, with the development of high-frequency communication (especially above 30 GHz), a large number of antennas is not only possible, but also has to compensate for the small array gain due to the compact antenna size. [0003] Digital beamforming is a well-developed technology in MIMO systems, which has the advantages of flexibility, adaptability and performance optimization. However, digital beamforming is too expensive and pow...

AI Technical Summary

Problems solved by technology

While there are power and cost advantages to analog beamforming, implementing it can be a huge challenge and reliability issue when designing RF hardware, especially for millimeter-wave (mm-wave) carrier signals

In the prior art, some simple analog beamforming structures have also been proposed to reduce its hardware complexity, but at the cost of reducing performance.

As with phase shifters, RF power amplifiers with variable gain are also necessary, which is what makes implementing analog beamforming still challenging and expensive.

Images