A fast automatic gain control circuit and method for ofdm system

A fast automatic gain control technology, applied in the transmission system, multi-frequency code system, baseband system components, etc., can solve the problems of gain value jitter, AGC does not take into account empty time slots, and cannot quickly adjust gain parameters, etc., to achieve The effect of reducing quantization error
CN104954033BInactive Publication Date: 2017-07-28FUDAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FUDAN UNIV
Publication Date
2017-07-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a rapid automatic gain control method based on an OFDM (orthogonal frequency division multiplexing) system. An OFDM receiver model based on an AGC (automatic gain control) module is used, attenuation and distortion of received signals are unavoidable due to complex and changeful transmission channels in the transmission process of OFDM signals, and the AGC module is generated to solve the problem of signal attenuation. However, traditional AGC has the shortcomings of low convergence speed, gain jitter and incorrect empty time slot adjustment. The novel rapid automatic gain control method can effectively overcome the three shortcomings, and simulation is correspondingly performed. A device comprises a gain adjustment portion and an analog amplifier based on an OFDM receiver module with the AGC module.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication, and in particular relates to a fast automatic gain control circuit and method for an OFDM system. Background technique

[0002] The future development and evolution of the fourth generation mobile communication system (4G) has become a hot topic in current research. Among the key technologies adopted by 4G, OFDM technology is undoubtedly the most important. The main idea of ​​OFDM technology is to divide a given channel into many narrow orthogonal sub-channels in the frequency domain, use a sub-carrier for modulation on each sub-channel, and transmit each sub-carrier in parallel, so the interference between signal waveforms can be greatly eliminated . OFDM can also adaptively distribute transmission loads on different sub-channels, so as to optimize the overall transmission rate. In addition, OFDM can resist frequency selective fading or narrowband interference. In the OFDM sys...

Claims

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