Automatic gain control method suitable for OFDM system

A technology of automatic gain control and control circuit, which is applied in the field of communication and can solve problems such as long convergence time

Inactive Publication Date: 2015-06-10
SUZHOU SIYUANTONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, when each frame adjustment is used, when the signal variation range is too large, it will take multiple frames to track the gain, which will cause the convergence time to be too long

Method used

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  • Automatic gain control method suitable for OFDM system
  • Automatic gain control method suitable for OFDM system
  • Automatic gain control method suitable for OFDM system

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Experimental program
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Effect test

Embodiment Construction

[0037] Such as figure 1 As shown, the automatic gain control circuit (AGC) mainly includes two parts: a signal energy measurement circuit and a gain adjustment circuit. The measurement circuit sums and averages the energy of the I-channel and Q-channel signals of the data sampled by the ADC in a sliding window, and selects the maximum value of the average energy of the sliding window in one frame and sends it to the gain adjustment circuit. The gain adjustment circuit selects the next appropriate gain configuration according to the energy measurement result of the energy measurement circuit and feeds it back to the low noise amplifier (LNA) and variable gain amplifier (VGA) of the front-end radio frequency receiving chip.

[0038] Such as figure 2 As shown, it is a schematic structural diagram of the measurement circuit, which includes a control circuit, a data buffer module, an energy calculation module, a sliding window processing module, an energy storage module, a maximu...

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Abstract

The invention relates to an automatic gain control method suitable for an OFDM (Orthogonal Frequency Division Multiplexing) system. The method comprises the following steps of measuring baseband signals and adjusting gains, and the method is realized by a measuring circuit and a gain adjustment circuit. In the method, an AGC (Automatic Gain Control) technology is executed by the OFDM system; the AGC includes two parts: measuring signals and calculating next used gains according to the measured value. The gain of a radio frequency receiver chip is adjusted by the cyclic prefix (CP) time of the OFDM system, gains in one frame can be repeatedly adjusted, convergence time is shortened, the OFDM symbol of the received signal can be tracked, the AGC locking is greatly quickened, and signals in one frame can be tracked. The reception of the effective data cannot be affected when the convergence time is shortened.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an automatic gain control method and circuit suitable for a wireless receiver. Background technique [0002] The automatic gain controller is an important part of the wireless communication system. The gain of the wireless receiver can be dynamically adjusted to adapt to receiving wireless signals of different strengths. [0003] The radio frequency signal generated by the transmitter is transmitted to the receiver through a wireless channel. Due to the influence of path attenuation and shadowing (shadowing), the signal will vary in a large range. In order to keep the signal entering the analog-to-digital converter (ADC) within an acceptable range. The gain of the amplifier in the radio frequency needs to be set reasonably to ensure that the signal entering the ADC will not be saturated, and the quantization range of the ADC can also be fully utilized. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/52H04L27/26
CPCH04W52/52H04L27/2601
Inventor 王川
Owner SUZHOU SIYUANTONG TECH
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