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A digital multi-beam forming method

A digital multi-beam and beam technology, applied in diversity/multi-antenna systems, space transmit diversity, line failure/interference reduction, etc., can solve the problems of low expected signal gain, reduced system tracking speed, MMSE algorithm failure, etc., to achieve improved Effects of capacity and working distance, improvement of tracking speed, and reduction of system cost

Active Publication Date: 2017-05-10
BEIJING RES INST OF TELEMETRY +1
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AI Technical Summary

Problems solved by technology

First of all, under the condition of strong interference, the pilot signal (or training sequence) cannot be received normally, and the MMSE algorithm will fail
In the case of strong interference, the direction of the desired signal cannot be estimated, and the LCMV algorithm will also fail. The power inversion algorithm can work normally, but its gain to the desired signal is low
Secondly, when the interference disappears, the weight vector convergence process of the adaptive beamforming algorithm will lead to a decrease in the system tracking speed

Method used

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  • A digital multi-beam forming method

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Embodiment Construction

[0037] figure 1 A digital multi-beamforming device according to a preferred embodiment of the present invention is shown. The preferred digital multi-beamforming device of the present invention includes: a physical channel (ADC) 11 for receiving signals from an antenna array (not shown), an FFT interference filtering module 12 for performing interference filtering on received signals, Estimated DOA estimation module 13, digital down-converter (DDC) 14 for converting received signal to baseband signal, spatial phase difference calculation module 15 for fixed beamforming, interference detection module 16, adaptive beamforming for beamforming Module 17.

[0038] figure 2 is an adaptive beamforming module 17 according to a preferred embodiment of the present invention. The beamforming module 17 adopts the form of a generalized sidelobe canceller (GSC), including: a static filter 18 for generating a reference signal d0(k), a blocking matrix 19, and an adaptive filter 20 for sup...

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Abstract

The invention relates to a digital multi-beam forming method. The digital multi-beam forming method comprises the following steps: judging whether interference exists in an input signal by performing interference detection on the input signal so as to perform signal synthesis through different beam forming algorithms; if the interference does not exist in the input signal, performing signal synthesis through a fixed beam forming algorithm; if the interference exists in the input signal, performing signal synthesis through an adaptive beam forming algorithm. According to the digital multi-beam forming method, when the interference does not exist, iteration is not needed, so that the signal tracking speed is high; when the interference exists, prior information such as the direction of a desired signal or an interference signal is not needed, so that the interference can be effectively suppressed.

Description

technical field [0001] The present invention relates to a digital multi-beam forming method, in particular to an improved adaptive beam forming method under interference conditions. Background technique [0002] In the field of measurement and control such as aerospace, the downlink signal of the target aircraft usually needs to transmit a variety of different data types, such as measurement data, data transmission data (multi-channel video, audio stream, etc.). Usually the measurement data bit rate is low and the digital transmission data bit rate is high. Due to the limitations of factors such as volume and power consumption, the target aircraft usually transmits with low power. In order to improve the operating distance of the measurement and control system, the measurement data can adopt the spread spectrum communication system. However, limited by the system bandwidth, receiver sensitivity, etc., the data transmission data cannot adopt the spread spectrum communicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B15/00H04L25/08
Inventor 牛飞李小梅
Owner BEIJING RES INST OF TELEMETRY
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