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
CN104954033AInactive Publication Date: 2015-09-30FUDAN UNIV
6 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
FUDAN UNIV
Publication Date
2015-09-30
Estimated Expiration
Not applicable Ā· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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 ā€‹ā€‹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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More