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Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system

An automatic gain control and fast technology, applied in transmission systems, multi-frequency code systems, baseband system components, etc., can solve problems such as gain value jitter, system bit error rate increase, and the inability to quickly adjust gain parameters, etc., to reduce quantization effect of error

Inactive Publication Date: 2015-09-30
FUDAN UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the traditional AGC adopts the fixed step adjustment method. When encountering a large channel change, the gain parameter cannot be adjusted quickly, and it takes a long time to converge to a stable value; and the fixed step adjustment method is easy to cause the gain value to jitter.
In addition, since traditional AGC does not consider the problem of empty time slots, unnecessary adjustments to time slots without actual data transmission may lead to an increase in the bit error rate of the system

Method used

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  • Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system
  • Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system
  • Rapid automatic gain control circuit and method for OFDM (orthogonal frequency division multiplexing) system

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Embodiment Construction

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

[0024] Such as figure 1 As shown, it is an OFDM receiver with an AGC circuit module. Among them, the AGC circuit module is composed of an analog amplifier and a gain adjustment part; the analog amplifier part is set before the A / D module of the OFDM receiver, and is used to amplify the signal received by the antenna, so that the dynamic range of the received signal is stabilized at A fixed range to prevent signal loss caused by too small received signal and saturation distortion caused by too large received signal; the gain adjustment part is set after the A / D module of the OFDM receiver for receiving the A / D of the OFDM receiver The output signal of the module, and the signal level is calculated and compared, and the gain value of the analog amplifier is adjusted to cope with the change of the dynamic range of the received signal caused b...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/16H04L27/26H04L25/03
Inventor 赵鑫刘俊周小林包晓晶
Owner FUDAN UNIV
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