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Method for controlling digital automatic electric-level gain

A technology of automatic level and control method, applied in the field of digital signal transmission, can solve the problems of signal power fluctuation at the receiving end, the influence of the transmission channel, and the influence of the receiving quality, etc., and achieve the effect of reducing the fluctuation range and high precision

Inactive Publication Date: 2006-10-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The invention solves the problem that the signal power at the receiving end will fluctuate in a large range due to the influence of the transmission channel during the wireless transmission of the digital signal, thus affecting the receiving quality

Method used

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  • Method for controlling digital automatic electric-level gain
  • Method for controlling digital automatic electric-level gain

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the examples.

[0015] The present invention adjusts the received signal through an automatic level gain control loop, figure 2 A digital AGC loop employed in the method of the present invention is shown. The AGC loop includes two complex multipliers, a square root detector, a logarithmic operator, a real number subtractor, a real multiplier, an integrator, and an antilog operator, and the control method is specifically:

[0016] In a communication system based on OQAM modulation, after the OQAM signal arrives at the receiver, it is demodulated first, and the complex signal obtained after demodulation is composed of two signals of I and Q, using (XI(n)+jXQ(n) ) to represent; (XI(n)+jXQ(n)) The I and Q two-way signals formed by (XI(n)+jXQ(n)) pass through a multiplexer respectively, and are multiplied with the control signal M of the digital AGC to obtain the output signal (YI(n)+jYQ (n)), this ...

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Abstract

The invention is realized through an auto level gain control loop, which includes two complex multiplication units, one square root detector, logarithm arithmetic unit, real subtracter, real multiplication unit, integrator and anti-logarithm arithmetic unit. Complex signal (XI(n)+jXQ(n)) composed of I route and Q route is obtained after demodulating signal. Then, the method includes steps: complex signal is multiplied by control signal M of digital AGC so as to obtain output signal (YI(n)+jYQ(n)); error signal ERR is obtained through following operations: sending (YI(n)+jYQ(n)) to signal power detector, taking square of imaginary part and real part respectively, then adding them, taking logarithm, and minus a reference value R; control signal M of AGC is obtained through following operations: ERR multiplied by gain value K, averaging and then taking anti-logarithm. Features are: controlling and compensating electric level effectively, reducing variation range of signal power.

Description

technical field [0001] The invention relates to a method in the technical field of digital signal transmission, in particular to a digital automatic level gain control method suitable for a digital television terrestrial broadcast receiver. technical background [0002] In a high-speed digital signal wireless transmission system, such as digital high-definition television (HDTV), the signal is affected by the transmission channel during the wireless transmission process, and has been affected by the use of the receiving antenna. The signal power at the receiving end will have a wide range. fluctuation. In actual situations, for example, in the case of vehicle movement, when entering and leaving the shelter of a building, the receiver is likely to receive a signal level of 3uV at a certain moment, and at another moment, it may just leave the building The signal received by the occlusion may be 1V. Therefore, an adjustment range of nearly 110dB is required for the received s...

Claims

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Application Information

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IPC IPC(8): H04N5/52
Inventor 归琳管云峰孙军
Owner SHANGHAI JIAO TONG UNIV
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