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Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater

A digital optical fiber direct amplifier, signal noise technology, applied in the direction of shaping network, electromagnetic repeater, electromagnetic wave transmission system in transmitter/receiver, can solve the problem of performance deterioration of base station, and achieve the effect of good system performance

Inactive Publication Date: 2009-07-22
福建先创电子有限公司 +1
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a carrier time slot in the prior art for the defect that the background noise will be superimposed and transmitted to the base station when it is not in use, which deteriorates the performance of the base station. Method and device for eliminating uplink signal noise in a GSM digital optical fiber repeater that does not generate superimposed noise signals or superimposed noise signals that are not used by the machine

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  • Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] like figure 1 Shown, in the method embodiment flowchart of eliminating uplink signal noise in the GSM digital optical fiber repeater of the present invention, comprise the following steps:

[0025] Step S11: Obtain the first baseband amplitude function by the first baseband signal: In this embodiment, this step squares the I(t) and Q(t) in the first baseband signal respectively and adds them to the square root, i.e. according to the formula processing to obtain the first baseband amplitude function, which reflects the amplitude values ​​of I(t) and Q(t) in the first baseband signal. In other embodiments, the amplitude of the first baseband signal may be expressed in other forms instead of the above formula, as long as it truly reflects the amplitude change of the first baseband signal.

[0026] Step S12: Low-pass filter the first baseband amp...

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Abstract

The invention relates to a method for eliminating an uplink signal noise in a GSM digital optical fiber repeater, the method comprises: converting a radiofrequency signal received by a repeating transmission aerial and sent by a mobile terminal into a first baseband signal comprising I(t) and Q(t), also comprises the following steps: taking out and processing the first baseband signal to obtain a first amplitude signal proportional to the first baseband signal amplitude function; delaying the first baseband signal; synthesizing the delayed first baseband signal and the first amplitude signal to obtain an second baseband signal of an optical signal for modulating and transmitting into a base station. The invention has beneficial effects: the noise of the apparatus provided by the invention can not be overlapped on a time slot in the carrier wave to transmit to the base station, thereby enabling the system performance to be better.

Description

technical field [0001] The invention relates to a method and a device for eliminating noise in a circuit, more specifically, to a method and a device for eliminating uplink signal noise in a GSM digital optical fiber repeater. Background technique [0002] With the development of mobile communication, the coverage of wireless network and the optimization of network show its importance day by day. Repeater system is an indispensable part in wireless network coverage and network optimization. However, most of the repeaters are based on radio frequency and analog transmission technology. Due to some defects of radio frequency and analog transmission technology, some people use digital optical fiber repeater. GSM digital optical fiber repeater adopts digital signal processing technology to convert the frequency of radio frequency signal to baseband and uses CPRI (public general radio interface) or custom interface to transmit mobile communication signal in the form of digital o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/16H04L25/02H04L25/03H04B10/29
Inventor 甘泉张广林袁勰吴刚
Owner 福建先创电子有限公司
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