Timing recovery method and device for roll-off coefficient variable broadband satellite transmission system
A technology of transmission system and roll-off coefficient, applied in the direction of transmission system, radio transmission system, electrical components, etc., can solve the problems of poor system performance and reduced accuracy of error estimation
Active Publication Date: 2020-02-04
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology
However, when the roll-off coefficient , especially when high-order modulation is used, the accuracy of error estimation is greatly reduced, and the system performance will become worse and worse
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[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0054] A timing recovery method for a broadband satellite transmission system with a variable roll-off coefficient, applied to a receiving end of the broadband satellite transmission system, and used for timing recovery of a signal received by the receiving end from a transmitting end of the broadband satellite transmission system, including The following steps:
[0055] (1) Match the signal output by the shaping filter in the sending end of the broadband satellite transmission system, and output the sampling signal to achieve the best reception of the signal; when the roll-off coefficient of the sending end changes, change the tap coefficient by looking up the table to realize A corresponding change in the roll-off factor at the receiving end;
[0056] (2) According to the roll-off coefficient of the sending end, the corresponding error estim...
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The invention discloses a timing recovery method and device for a roll-off coefficient broadband satellite transmission system, and belongs to the technical field of timing recovery of broadband satellite adaptive transmission systems. The method comprises the following steps: firstly, correspondingly adjusting a roll-off coefficient of a matched filter according to the roll-off coefficient of a forming filter; judging which timing error estimation algorithm is adopted by the signal output by the matched filter according to the roll-off coefficient; secondly, adopting different timing error estimation algorithms to obtain estimation errors, adopting the same loop filter, timing NCO and interpolation filter, adjusting parameters of the loop filter, and interpolating an optimal sampling value yk in four times of sampling points. According to the characteristics of the broadband satellite self-adaptive transmission system with the variable roll-off coefficient, the roll-off coefficient ofthe matched filter is correspondingly adjusted according to signaling information, optimal receiving can be achieved, different timing algorithms are adopted according to the roll-off coefficient, and it can be guaranteed that the system works stably.
Description
technical field [0001] The invention relates to the technical field of timing recovery of a broadband satellite adaptive transmission system, in particular to a timing recovery method and device for a broadband satellite transmission system with a variable roll-off coefficient, which can be used for communication with a variable roll-off coefficient and a high-order modulation method System timing recovery. Background technique [0002] In the broadband satellite adaptive transmission system with variable roll-off coefficient, the change of the roll-off coefficient of the shaping filter at the sending end can change the transmission bandwidth and affect the transmission efficiency. However, if a general-purpose matched filter with a fixed roll-off coefficient is used at the receiving end, optimal reception cannot be achieved, which will seriously affect system performance. In addition, when the general-purpose matched filter is applied in broadband, the tap coefficient is u...
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Login to View More IPC IPC(8): H04B7/185
CPCH04B7/1851H04B7/18519H04B7/18586
Inventor 崔霞霞李新玲苟晓刚王少飞张丽娜刘一龙韩中良
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP