Echo detection and self-excitation elimination method for electromagnetic wave common-frequency amplifying repeater system

A technology of echo detection and electromagnetic wave, which is applied in the direction of radio transmission system, transmission system, electrical components, etc., can solve the problems of large system delay, high cost, limited offset degree, etc., and achieve the effect of small delay

Active Publication Date: 2011-07-20
深圳市佳贤通信科技股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This solution has high engineering costs and high requirements for equipment isolation. Changes in amplifier gain or antenna isolation caused by long-term device aging and environmental changes will cause repeater power to drop or cause self-excitation. When isolation is insufficient, only Reduce the gain, the repeater amplifier cannot transmit at full power
[0004] 2. Adopt the technical solution of down-conversion first, digital baseband canceling the echo and then up-conversion. This solution is complex in technology, high in cost, large in system delay, and limited in offsetting degree
When the isolation is insufficient, the gain must be reduced, and the amplifier cannot transmit at full power

Method used

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  • Echo detection and self-excitation elimination method for electromagnetic wave common-frequency amplifying repeater system
  • Echo detection and self-excitation elimination method for electromagnetic wave common-frequency amplifying repeater system
  • Echo detection and self-excitation elimination method for electromagnetic wave common-frequency amplifying repeater system

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Embodiment Construction

[0020] 1. Phase detection method

[0021] image 3 As shown: the signal received by the receiving antenna is amplified by an amplifier with adjustable gain, and enters the phase adjustment circuit. After that, the signal is coupled by a coupler for power detection. The output signal of the coupler is transmitted through the transmitting antenna, and the power detection signal enters the MCU. The MCU controls the phase and amplifier gain.

[0022] Method 1: Turn on the amplifier gain and adjust it to the minimum, slowly increase the amplifier gain and adjust the phase quickly 180 degrees, the amplifier works between the A and C curves, record the power in the A curve and C curve, when it reaches the G2 point, the output is found when the phase is adjusted If the power changes to more than 3dB, it means that there is 3dB away from the self-excitation point. Locate the phase of the highest power point, continue to increase the transmit gain slowly, so that the power reaches the ...

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Abstract

The invention relates to an echo detection and self-excitation elimination method for an electromagnetic wave common-frequency amplifying repeater system. By using the method, a relationship among grains of an amplifier, a phase when returned electromagnetic wave signals reach a receiving antenna and the output power of the amplifier in the electromagnetic wave common-frequency amplifying repeater system is discovered. According to the relationship, the magnitude of echo signals can be detected effectively, the output power of the amplifier is improved, the self-excitation of the amplifier resulting from the echo signals is avoided, the requirements on isolations of a forward antenna and a backward antenna are reduced, the system grains are improved, and the coverage area is increased. The method is suitable for all electromagnetic wave common-frequency amplifying repeater systems, such as communication repeaters, data television repeaters and the like.

Description

technical field [0001] The invention relates to a method for detecting and self-excited elimination of returned electromagnetic waves (echo waves) in an electromagnetic wave signal co-frequency amplifying repeater system. For wireless communication, digital TV, wireless data relay and other radio broadcasting systems, in areas far away from the transmitting base station, or due to factors such as terrain, it is necessary to enhance the signal in some areas with poor coverage, or to increase the coverage, electromagnetic wave signal The same-frequency amplification repeater device is a simple and low-cost solution. The principle is to amplify the smaller signal and re-transmit it. In this system, part of the retransmitted signal will return to the receiving antenna. When the amplification gain of the repeater is greater than the isolation between the receiving antenna and the retransmitting antenna, the echo will Make the repeater self-excited and paralyze the whole system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B17/00H04B7/155
CPCY02D30/70
Inventor 赵小林
Owner 深圳市佳贤通信科技股份有限公司
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