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Burst signal detecting and AGC method for orthogonal frequency division multiplexing system

A technology of automatic gain control and burst signal, applied in the direction of orthogonal multiplexing system, multiplexing communication, transmission system, etc., can solve the problem of frame synchronization and frequency synchronization of lost, easily affected, and unfavorable OFDM receiving systems and other issues to achieve the effect of reducing time and improving performance

Inactive Publication Date: 2003-03-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Since the RF envelope detector has a certain delay, when the RF envelope detector output is greater than a certain reference voltage of the bridge network, that is, when a signal transmission is detected, a part of the useful training signal at the head of the frame has been lost, which is not conducive to Frame Synchronization and Frequency Synchronization in OFDM Receiving System
At the same time, RF analog devices are relatively susceptible to interference, and the device itself has certain separation characteristics, resulting in low detection accuracy of burst signals and being easily affected

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  • Burst signal detecting and AGC method for orthogonal frequency division multiplexing system
  • Burst signal detecting and AGC method for orthogonal frequency division multiplexing system
  • Burst signal detecting and AGC method for orthogonal frequency division multiplexing system

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[0038] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and application embodiments of single-carrier OFDM communication systems.

[0039] The present invention can be applied in the receiving system of wireless local area network IEEE802.la, and functional block diagram is as figure 1 shown. At the receiving end, after the signal is received by the antenna, the noise signal outside the passband of the filter is filtered through the band-pass filter, and the filtered signal is input to the first-stage power amplifier to amplify the signal. The amplified signal will go through the analog quadrature demodulation DAQM module. The main function of this module is to directly demodulate the signal from the intermediate frequency to the baseband. This is much more convenient and efficient than the previous multi-level demodulation method. . In order to detect the digital signal at the baseband, an analog-...

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Abstract

A method of burst signal detecting for orthogonal frequency division multiplexing system and a control method for automatic gain can carry out the burst signal detection of baseband digital signal and can utilize the detecting result of the burst signal to control the digital switch and at the same time to control the work of AGC for regulating the gain of the entire system after the analog or thogonal demodulating and analog to digit converting. The method can be easily realized with high detection accuracy, less calculation, can quickly regulate AGC and to be used for various OFDM system such as the European digital video broadcast digital TV ground broadcast and orthogonal frequency division multiple access of radio local net.

Description

Technical field: [0001] The invention relates to a burst signal detection and automatic gain control method of an orthogonal frequency division multiplexing (OFDM) communication system, which is a method for signal detection and power control in an orthogonal frequency division multiplexing (OFDM) communication system, belonging to The field of digital communication technology. Background technique: [0002] Orthogonal frequency division multiplexing technology began to be used in the military field in the 1960s, and it did not gradually enter the civilian field until the 1970s. Since this modulation method has a high spectrum utilization rate, it is widely used in wireless transmission systems. OFDM has been adopted by European digital audio broadcasting (DAB) and digital TV terrestrial broadcasting standard (DVB-T), and it has also become a wireless local area network (ETSI Hiperlan / 2 and IEEE802.11a) and broadband wireless access (IEEE 802.16) The core technology of the...

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Application Information

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IPC IPC(8): H04J11/00H04L27/38H04N7/015
Inventor 周军丁颢周跃峰罗汉文宋文涛
Owner SHANGHAI JIAO TONG UNIV
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