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Processing method for radio access system on downlink signals based on optical fiber radio

A wireless access system, optical fiber radio technology, applied in optical fiber radio, electromagnetic wave transmission system, optical fiber transmission and other directions, can solve the problem of non-adaptive changes, and achieve the effect of simplifying the system structure

Inactive Publication Date: 2008-03-19
孟月萍
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  • Abstract
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  • Application Information

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Problems solved by technology

[0013] The present invention solves the problem that the predistortion processing for compensating the nonlinear distortion generated by optical modulation can only be used in a fixed signal environment, and cannot make adaptive changes according to changes in signal voltage and power

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  • Processing method for radio access system on downlink signals based on optical fiber radio
  • Processing method for radio access system on downlink signals based on optical fiber radio

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Embodiment Construction

[0023] As shown in Figure 1, in the central station CS, the digital baseband processing BB and the digital intermediate frequency processing IF part adopt software radio technology, that is, they are realized by a programmable module. Using software to process all baseband signals and intermediate frequency signals, with strong data processing capabilities, and rewriting the software program can cost-effectively transform a wireless system that works on a defined modulation method, frequency and bandwidth into another system. . The system has strong adaptability, low system maintenance cost, and has the feature of reconfigurability, which is convenient for the system to be compatible and upgraded to the wireless standard. The link between the central station CS and the radio base station RBS uses optical fiber radio technology, that is, converts between intermediate frequency signals and radio frequency signals, and transmits radio frequency signals on optical fibers, so that ...

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Abstract

The invention provides a processing method of a wireless access system based on fiber wireless on downgoing signals, which performs pre-distortion processing to digital intermediate frequency. The pre-distortion processing can compensate the non-linear distortion caused by a station amplifier and a photomodulator.

Description

technical field [0001] The invention relates to a method for processing downlink signals in a wireless access system based on optical fiber radio, in particular to a pre-distortion processing method therein. Background technique [0002] In the case of optical fiber transmission of analog signals, the optical modulator should first modulate the analog signal into an optical signal before transmitting it on the optical fiber. When the signal frequency is close to the operating frequency of the optical modulator, resonance will occur, which will cause nonlinear distortion of the signal. In order to compensate for this nonlinear distortion, the common method is to use electronic devices to pre-distort the analog signal, which is referred to as analog pre-distortion. . [0003] When a power amplifier amplifies an analog signal whose amplitude exceeds its linear region, the amplified signal will contain nonlinear distortion. The higher the peak-to-average power ratio (PAPR) of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B10/20H04B10/2575H04L25/49
Inventor 刘丽丽陈忆群熊燕张谦罗英辉
Owner 孟月萍
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