Tracking control method of digital communication receiver time and carrier frequency synchronization

A technology of receiver time and carrier frequency, applied in multi-frequency code systems and other directions, can solve problems such as difficulty in determining weight coefficients, affecting synchronization accuracy, and long synchronization time, achieving simple and accurate automatic tracking control, The effect of less resource consumption

Inactive Publication Date: 2012-04-18
TIANJIN UNIV
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Problems solved by technology

The main defects of this technology are as follows: due to the influence of factors such as multipath effect, Doppler effect and channel frequency selective fading, it is difficult to express the received signal with an accurate mathematical model. , the determination of the weight coefficient will become more difficult. If the coefficient is too small, the synchronization time will become longer. If the coefficient is too large, the correction value will be inaccurate and affect the synchronization accuracy. state error

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  • Tracking control method of digital communication receiver time and carrier frequency synchronization
  • Tracking control method of digital communication receiver time and carrier frequency synchronization
  • Tracking control method of digital communication receiver time and carrier frequency synchronization

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specific Embodiment

[0061] 1) Set the parameters of the PID controller according to the method in PID controller parameter tuning. For simplicity of realization, the calculation of the differential coefficient can be discarded, because the differential part has very little influence on the whole tracking control process. For carrier frequency synchronous tracking control, set the proportional coefficient K P is 0.5, the integral coefficient K I is 0.001; for time synchronous tracking control, set the proportional coefficient K P is 0.1, the integral coefficient K I is 0.0003. The above parameters remain unchanged during the entire synchronous tracking control process.

[0062] 2) The sequence numbers of the pilot carriers are 16, 48, 64. The Hamming window W(n) is equal to 0.54+0.46*cos(2*π*n / N), when |n| is not greater than N / 2 / ; in other cases, W(n) is equal to 0, where N=512. The number of points for IFFT transformation is 512.

[0063] 3) When performing symbol time synchronous trackin...

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Abstract

The invention belongs to the field of digital communication receivers, and relates to a tracking control method of digital communication receiver time and carrier frequency synchronization. The tracking control method comprises the following steps of: selecting a parameter of a PID (Proportion Integration Differentiation) controller; obtaining a decimal time deviation R(k) between the carrier frequency and a symbol; obtaining a residual deviation E(k) subjected to former deviation correction; carrying out following clinical value regulation on the decimal time deviation R(k): calculating a deviation correction value U(k) of the tracking control; and judging whether the U(k) is in the specified range, if not, resetting the parameter of the PID controller, if yes, carrying out carrier frequency and symbol time synchronization by using the correction value. The invention can better eliminate influences of steady-state errors, and is not sensitive to influence of quality of the tracking control to the control coefficient, thereby ensuring that the control coefficient is determined more simply and easily.

Description

Technical field [0001] The invention belongs to the field of digital communication receivers, in particular to a digital sound broadcast receiver conforming to the DRM standard. Background technique [0002] DRM digital broadcasting is a global digital sound broadcasting standard formulated by the European Telecommunications Union (ETSI). This standard is currently the only digital sound broadcasting standard in the world that supports both AM and FM bands. It is suitable for frequency bands below 174MHz and can be used for the digital transformation of medium and short wave analog AM and VHF band analog FM broadcasting. Because it is highly compatible with traditional analog broadcasting in terms of bandwidth occupation, and can make full use of existing transmitting equipment, it has developed very rapidly. Many European countries have launched their own DRM broadcasting. [0003] The modulation method adopted by DRM digital sound broadcasting is OFDM (Orthogonal Frequenc...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 马永涛刘开华段建峰刘新元
Owner TIANJIN UNIV
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