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Detection-based OFDM signal gain control method and apparatus, and recording medium

A technology of signal gain and control method, applied in modulation carrier system, digital transmission system, electrical components, etc., can solve problems such as inability to effectively adjust signal level and performance loss of demodulation algorithm, achieve accurate gain control performance, ensure effective Sexual, low-complexity effects

Active Publication Date: 2018-12-04
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

[0006] The above literatures mainly perform feedforward or feedback power control by signal second-order moment power estimation, using different control step sizes, mixing coefficients or multi-level adjustment structures, and do not make corresponding power control improvements for the time-domain signal characteristics of OFDM signals. These methods are in The signal level cannot be effectively adjusted under multipath interference or low signal-to-noise ratio, which will cause performance loss of the demodulation algorithm based on threshold detection in the OFDM receiver

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  • Detection-based OFDM signal gain control method and apparatus, and recording medium
  • Detection-based OFDM signal gain control method and apparatus, and recording medium
  • Detection-based OFDM signal gain control method and apparatus, and recording medium

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Embodiment 1

[0094] figure 2 Shown is the simulation performance of the OFDM signal gain control method based on detection of the present invention, adopts N=512 long FFT signal, QPSK modulation, simulation adopts the gain control error of the gain control method of the present invention and adopts the gain control error of the traditional second-order moment method Under the AWGN channel of SNR=-10dB~20dB, the normalized deviation, the vertical axis is the percentage of the deviation. From the analysis of the simulation results, it can be known that the gain control adjustment method of the present invention is 18dB higher than the traditional second-order moment gain control method. At SNR=- 10dB fashion can accurately control the gain, while the traditional second-order moment gain control method can only achieve the same performance when SNR>10dB.

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Abstract

Provided in the invention is a detection-based OFDM signal gain control method. The method comprises: step one, on the basis of a preset initial gain control parameter and a second-order moment signalpower of an OFDM signal, estimating and calculating error tracking signal EA1 of the gain control, detecting leading symbol data yP (n) of the OFDM signal and a receiving signal y(n); step two, according to the leading symbol data yP (n) obtained at the step one, calculating an error tracking signal EA2 of time-domain gain control; and step three, according to the receiving signal y(n) obtained at the step one, calculating an error tracking signal EA3 of frequency-domain gain control.

Description

technical field [0001] The invention relates to a detection-based OFDM signal gain control method, device and recording medium, and belongs to the technical field of digital wireless communication transmission. Background technique [0002] In the aircraft measurement and control communication system, the relative position relationship between the airborne communication terminals and between the airborne communication terminal and the ground control station during the navigation process has a dynamic change characteristic. It is difficult for the general measurement and control communication system to adjust the transmission power through power control to achieve stability. For signal reception, automatic gain control (Automatic Gain Control, AGC) is often used on the receiver side to achieve large dynamic range reception of received signals. Especially in the high-speed data transmission UAV data link system based on TDD single-duplex mode of burst transmission, it is neces...

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2692H04L27/2695
Inventor 付林罡闫朝星孙亚男李辉焦东立彭浪胡学明李旭鹏
Owner BEIJING RES INST OF TELEMETRY
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