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Self-excitation interference elimination method of global system for mobile communication (GSM) repeater based on time slot detection

A technology of time slot detection and interference elimination, which is applied in transmission noise suppression, radio transmission systems, electrical components, etc., can solve problems such as isolation requirements, and achieve the effect of meeting the index range of phase error and vector magnitude error and reducing requirements

Active Publication Date: 2011-10-19
WUHAN HONGXIN TELECOMM TECH CO LTD
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a self-excited interference elimination method adapted to the transmission characteristics of the GSM system to solve the problem of the isolation required by the GSM wireless repeater

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  • Self-excitation interference elimination method of global system for mobile communication (GSM) repeater based on time slot detection
  • Self-excitation interference elimination method of global system for mobile communication (GSM) repeater based on time slot detection
  • Self-excitation interference elimination method of global system for mobile communication (GSM) repeater based on time slot detection

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[0024] In order to make it easier for those skilled in the art to understand and implement the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The self-excited interference elimination method of the GSM repeater based on time slot detection in the present invention is characterized in that: the input signal entering the normalized LMS algorithm is valid data in the GSM / EDGE time slot structure, and the normalized LMS algorithm is carried out.

[0026] see figure 1 , is the principle block diagram of interference self-excited cancellation. The digital baseband signal d(n) from digital down-conversion is the sum of signal and noise, that is, d(n)=x(n)+N(n). The input to the adaptive filter is a sample of the output signal, which can be expressed as another noise N'(n) related to N(n). When x(n) is uncorrelated with N(n), the adaptive filter will normalize the coe...

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Abstract

The invention discloses a self-excitation interference elimination method of a global system for mobile communication (GSM) repeater based on time slot detection, comprising the following steps: step one: carrying out time slot detection on a GSM signal entering a self-excitation elimination algorithm, and judging the effective time slot data to be used for the interference self-excitation elimination algorithm; step two: carrying out a normalization least mean square algorithm, and iterating and calculating a weight coefficient; and step three: updating the coefficient in a self-adapting filter by utilizing the iterative weight coefficient, and carrying out self-excitation interference elimination. The method provided by the invention has the advantages of adapting to the technical characteristics of GSM / EDGE (enhanced data rate for GSM evolution) signals, obtaining 30dB gain on antenna insulation degree of the repeater through carrying out interference self-excitation elimination algorithm processing on the valid data extracted in a time slot format, and reaching the requirements of the system on the GSM phase error and EDGE vector amplitude error when the signal is analyzed.

Description

technical field [0001] The present invention relates to a GSM repeater self-excited interference elimination method based on time slot detection, in particular to a self-excited interference elimination design of a normalized LMS algorithm under the premise of detecting effective information in the GSM / EDGE time slot format method. Background technique [0002] The use of wireless repeater as a technology to enhance wireless network coverage has become increasingly large-scale, but the difficulty of its system construction has always restricted its development. If the isolation between the donor antenna and the retransmission antenna is not set properly, it is easy to cause self-excitation and deteriorate network coverage. [0003] There are two main methods for the traditional wireless repeater to overcome the self-excitation phenomenon, one is to increase the isolation between the donor and the retransmission antenna, and the other is to reduce the gain of the repeater. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W88/08H04B15/00H04B7/155
Inventor 王卫明刘永飘祁中洋蔡清
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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