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Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater

A repeater and noise technology, applied in radio transmission systems, power management, electrical components, etc., can solve problems such as inaccurate detection of time slot boundaries, unstable uplink signals, etc., and achieve the effect of eliminating uplink noise and eliminating noise

Active Publication Date: 2013-07-10
SUNWAVE COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the instability of the uplink signal, the time slot boundary cannot be accurately detected

Method used

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  • Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater
  • Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater
  • Method for reducing uplink noise of GSM (Global System for Mobile Communications) digital repeater

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0025] figure 1 It is an algorithm block diagram of the present invention; the algorithm is in the digital baseband processing part of the GSM digital optical fiber repeater far-end machine, including DDC (digital lower side frequency), CPRI (common public radio interface), and this algorithm (low noise suppression) . This algorithm is mainly divided into three modules—time slot boundary detection module, delay compensation calculation module, and time slot shutdown logic module.

[0026] The solid arrows in the figure indicate the flow direction of GSM signals, and the non-solid arrows are logic signals such as control and indication. The downlink signal passes through the CPRI module to complete the extraction of the baseband I / Q signal (complex signal) and the control word. After the I / Q signal is input to the time slot boundary detection module, the pow...

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Abstract

The invention discloses a method for reducing the uplink noise of a GSM (Global System for Mobile Communications) digital repeater, which comprises the following steps of: processing an uplink GSM signal by a DDC (Direct Digital Control) module to obtain a baseband I / Q signal of each carrier wave; determining the border of each time slot of each carrier wave according to an uplink border indication pulse signal; and counting the powers of all time slots, if the power value is smaller than the threshold power value configured by an upper computer, considering the time slot as noise, and setting the baseband signal I / Q of the time slot to zero. The method is realized in a digital board of a remote computer, the uplink noise of the remote computer is eliminated, and the method can be used for eliminating the noise on an uplink useless channel.

Description

technical field [0001] The invention relates to a method for reducing the uplink noise of a repeater, in particular to a method for reducing the uplink noise of a GSM digital repeater. Background technique [0002] With its advantages of stable operation, good coverage effect, and flexible design and construction, optical fiber repeaters are increasingly used in repeater coverage solutions. The coverage scheme of the optical fiber repeater is generally in the form of one-to-many, that is, one near-end unit is connected to multiple remote-end units. There are various topologies: star, ring, bus, etc. However, due to the ring and bus topology, the uplink signal from the mobile station to the base station will be superimposed multiple times after passing through multiple remote machines, especially the superposition of noise, which will seriously affect the useful signal on the same channel. As a result, the signal-to-noise ratio of the signal at the base station side is seve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/00H04W88/08H04B7/155
CPCY02B60/50
Inventor 金淮东王文元王利强
Owner SUNWAVE COMM
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