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Automatic gain control method for time orthogonal frequency division multiplexing system

An automatic gain control, orthogonal frequency division technology, applied in multi-frequency code systems, power management, electrical components and other directions, can solve the problems of gain value jitter, AGC does not consider empty time slots, system bit error rate improvement, etc. To achieve the effect of reducing quantization error

Inactive Publication Date: 2010-08-18
FUDAN UNIV
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AI Technical Summary

Problems solved by technology

[0004] Most of the traditional AGC adopts a 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 adjustment method with a fixed step size is likely to cause the problem of gain value jitter
In addition, because traditional AGC does not consider the problem of empty time slots, unnecessary adjustments will be made to time slots without actual data transmission, which may lead to an increase in the system bit error rate

Method used

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  • Automatic gain control method for time orthogonal frequency division multiplexing system
  • Automatic gain control method for time orthogonal frequency division multiplexing system
  • Automatic gain control method for time orthogonal frequency division multiplexing system

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Embodiment Construction

[0030] Method flow chart of the present invention is as figure 1 shown.

[0031] Step 101: Set an initial gain value for the AGC module. The initial value of the AGC gain can be set to any reasonable value from 20dB to 40dB. The preferred value of the initial value of the AGC gain is 30dB.

[0032] Step 102: Measure the average signal power of each frequency point. Sampling the energy of the first N data of each frequency point i, the energy d of the N data points j The root mean square of is taken as the average signal power of frequency point i. Among them, N is the detection data length. Therefore, the average signal power P of frequency point i i The calculation formula is as follows:

[0033] P i = 1 N Σ j = 1 N | d j ...

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Abstract

The invention belongs to the technical field of the digital communication and particularly relates to an automatic gain control method for an orthogonal frequency division multiplexing system. The method of the invention comprises the following steps: setting a gain initial value of the AGC; measuring a signal average power of each frequency point; judging whether a power average value is less than a noise threshold, and if not, comparing the maximum value of the signal average powers with a target power value and taking the difference value of the maximum value and the target power value as an AGC adjustment increment; if the AGC adjustment increment exceeds an adjustment threshold, adjusting an AGC gain value; and completing the AGC process and outputting a received signal which is subjected to gain adjustment to carry out post-processing. The method of the invention can guarantee the signal power stabilized in an optimum range and reduce the quantization error of the post-processing.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to a method for controlling the power of a received signal in an orthogonal frequency division multiplexing communication system. Background technique [0002] As the third-generation mobile communication system (3G) gradually enters the stage of practical application, the future development and evolution of the fourth-generation mobile communication system (4G) has become a current research hotspot. Among the key technologies adopted by 4G, OFDM is undoubtedly the most important one. Compared with multiple access technologies such as FDMA, TDMA, and CDMA, OFDM is most suitable for 4G systems. 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 wavef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04H04L27/26
Inventor 包晓晶周小林刘俊
Owner FUDAN UNIV
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