Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater
A technology of digital optical fiber direct amplifier and signal noise, which is applied in transmitter/receiver shaping network, electromagnetic repeater, electromagnetic wave transmission system, etc. It can solve the problems of base station performance deterioration and achieve good system performance
Inactive Publication Date: 2012-04-25
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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[0023] The present invention will be further described below in conjunction with the drawings and embodiments.
[0024] Such as figure 1 As shown, in the flowchart of the embodiment of the method for eliminating uplink signal noise in a GSM digital optical fiber repeater according to the present invention, the following steps are included:
[0025] Step S11: Obtain the first baseband amplitude function from the first baseband signal: In this embodiment, in this step, I(t) and Q(t) in the first baseband signal are respectively squared and added, and then squared. According to the formula Through processing, the first baseband amplitude function is obtained, which reflects the amplitude values of I(t) and Q(t) in the first baseband signal. In other embodiments, the above formula may not be used to express the amplitude of the first baseband signal, but may be expressed in other forms, as long as it truly reflects the amplitude change of the first baseband signal.
[0026] Step S12:...
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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 afirst 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 inventioncan 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, and 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 communications, wireless network coverage and network optimization have increasingly shown their importance. The repeater system is an indispensable part of wireless network coverage and network optimization. However, most of the current repeaters are based on radio frequency and analog transmission technologies. Due to some defects in radio frequency and analog transmission technologies, some people use digital optical fiber repeaters. GSM digital optical fiber repeater station uses digital signal processing technology to convert radio frequency signals to baseband and uses CPRI (Common Common Radio Interface) or a custom interface to transmit mobile communication signals in the form of digi...
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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