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Method for inhibiting uplink back noise of digital optical fiber repeater

A digital optical fiber direct amplifier, low noise technology, applied in the direction of synchronization device, power management, wireless communication, etc., can solve the problems that affect the performance of the base station system, high noise floor, etc.

Inactive Publication Date: 2011-01-05
XIAMEN UNIV
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Problems solved by technology

[0005] Since the conventional GSM digital optical fiber repeater system does not have a noise floor suppression function, when multiple remote units are cascaded, in the same time slot, the uplink noise of each remote unit will also be superimposed on the near-end unit. As a result, a higher floor noise occurs, which is coupled to the base station through the near-end machine, affecting the performance of the base station system

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  • Method for inhibiting uplink back noise of digital optical fiber repeater
  • Method for inhibiting uplink back noise of digital optical fiber repeater
  • Method for inhibiting uplink back noise of digital optical fiber repeater

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[0020] The present invention will be further described in detail in conjunction with the accompanying drawings and preferred embodiments.

[0021] Figure 1b It is the structural block diagram of the digital optical fiber repeater far-end machine with bottom noise suppression function of the present invention, and Figure 1a Compared with the structure of traditional digital optical fiber repeater, it includes antenna 11, radio frequency processing module 12, analog-to-digital converter (ADC) 13, digital-to-analog converter (DAC) 14, digital down-conversion (DDC) module 21, digital up-conversion In addition to frequency conversion (DUC) module 22, optical fiber communication module (CPRI) 23 and photoelectric converter 24, time slot synchronous clock extraction module 25 and floor noise suppression module 26 are also provided, and this floor noise suppression module 26 is also subjected to time slot synchronous clock extraction Module 25 generates control of the slot synchrono...

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Abstract

The invention relates to a method for inhibiting the back noise of a digital optical fiber repeater. A time slot synchronous clock extracting module is additionally arranged in a remote machine to ensure that a power calculating and judging unit in a back noise inhibiting module can be used for carrying out power calculation on an uplink signal and comparing the power with a preset power threshold under the control of a time slot synchronous clock so as to distinguish the signal and noise, thereby achieving the aim of eliminating the back noise; and in addition, because the time slot synchronous clock extracting module is additionally arranged in the remote machine, the invention can also ensure that a signal emitting channel is accurately opened or closed in the process of eliminating the uplink noise without generating the phenomenon of frequently opening and closing the signal emitting channel in short time due to judgment fault so as to influence communication quality.

Description

technical field [0001] The invention relates to a method for suppressing bottom noise of a digital optical fiber repeater, in particular suitable for suppressing the bottom noise of the uplink of a GSM digital optical fiber repeater. Background technique [0002] With the rapid development of the mobile communication industry, people's requirements for the coverage area and coverage quality of the cellular mobile communication network continue to increase. Due to the characteristics of wireless signal transmission, coverage blind spots inevitably exist in urban or suburban areas. However, because these blind areas are usually not large in scope and the number of users is not large, the cost of building new base stations in these blind areas appears to be relatively high. With its advantages of less investment, simple structure, and convenient and flexible installation, the repeater has become an important means to make up for blind spots and optimize network coverage. The ...

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Application Information

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IPC IPC(8): H04W52/04H04W56/00
Inventor 陈凌宇石江宏陈岳林李峰
Owner XIAMEN UNIV
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