Automatic gain control system in orthogonal frequency division multiplexing receiver and method

A technology of automatic gain control and orthogonal frequency division, applied in gain control, amplification control, multi-frequency code system, etc., can solve the problem of frame synchronization, frequency synchronization, RF analog devices susceptible to interference, burst The signal detection accuracy is not high enough to achieve the effect of overcoming the inaccuracy of energy estimation, overcoming the failure of the synchronous correlator, and improving the frame detection rate and decoding success rate.

Inactive Publication Date: 2010-09-08
FUDAN UNIV
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Problems solved by technology

Due to the delay of the RF envelope detector, when the output of the RF envelope detector is greater than a certain reference voltage value of the bridge network, the system detects the transmission of the signal. It is not conducive to the frame synchronization and frequency synchro

Method used

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  • Automatic gain control system in orthogonal frequency division multiplexing receiver and method
  • Automatic gain control system in orthogonal frequency division multiplexing receiver and method
  • Automatic gain control system in orthogonal frequency division multiplexing receiver and method

Examples

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Example Embodiment

[0030] Such as figure 1 As shown, in the orthogonal frequency division multiplexing receiver system, the antenna is in sequence with the same filter, radio frequency gain amplifier, analog quadrature demodulator, A / D analog-to-digital converter, time domain power processor, and initial gain controller , Digital baseband amplifier, frame synchronization decider, frequency domain equalizer, decoder, frequency domain power processor and gain generator are connected.

[0031] The band pass filter is used to filter out the noise outside the pass band except the data signal used in the system. The input end is an antenna, and the output end is an analog-to-digital converter.

[0032] The RF gain amplifier is used to control the amplitude of the signal in the RF frequency band. The input end is a band pass filter, and the output end is an analog quadrature demodulator.

[0033] The analog quadrature demodulator is used for quadrature demodulation of radio frequency signals and converts th...

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Abstract

The invention belongs to the technical field of the wireless digital communication, particularly relates to an automatic gain control system in an orthogonal frequency division multiplexing receiver and a method. An antenna of the orthogonal frequency division multiplexing receiver system is sequentially connected with a band-pass filter, a radio-frequency amplifier, an orthogonal demodulator, an analog-to-digital converter, a time domain power processor, a gain controller, a baseband digital gain amplifier, a frame synchronic judger, a frequency domain balancer, a decoder, a frequency domain processor and a gain generator. The time domain power processor, the gain controller, the baseband digital gain amplifier, the frequency domain processor and the gain generator form an automatic gain control system. The frequency domain processor consists of a comparison judger and an energy estimator. The automatic gain control system can prevent the valid signal from being submerged by slowly-decreasing signals, overcomes the problems such as the invalidity of synchronic correlator caused by the signal oscillation because of the variation of the gain, obtains a stable gain value, and improves the frame detection rate and the decoding success rate.

Description

technical field [0001] The invention belongs to the technical field of wireless digital communication, and in particular relates to a frequency-domain automatic gain control system and a method of a time-domain synchronous Orthogonal Frequency Division Multiplexing system. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is a multi-carrier modulation technology. The main idea is to convert high-speed data signals into parallel low-speed sub-data streams, and then modulate them into each orthogonal sub-channel for transmission. Ideally, the signals on the orthogonal channels do not interfere with each other. The signal bandwidth on each sub-channel is smaller than the relevant bandwidth of the channel, so the bandwidth on each sub-channel is only a small part of the original channel bandwidth, and channel equalization becomes relatively easy. Due to its high spectral efficiency and the ability to easily deal with intersymbol interference caused...

Claims

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Application Information

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IPC IPC(8): H03G3/20H04B1/16H04B7/26H04L27/26
Inventor 刘俊周小林马继鹏王乃博
Owner FUDAN UNIV
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