Synchronous equalizing method in high speed data transmission system

Abstract

The invention discloses a synchronous equalizing method in a high speed data transmission system. The method comprises the steps of: step 1, estimating and compensating a large frequency offset of a digital baseband signal; step 2, performing timing synchronization to the signal, the large frequency offset of which is compensated; locating an optimal sampling time; step 3, performing carrier synchronization by using a decision directed algorithm to realize residual carrier frequency offset estimation; before feeding carrier frequency offset information back to a timing synchronization module, realizing residual frequency offset compensation correction; and step 4, performing adaptive blind broadband balance to the synchronized signal by using a CAM (Constant Modulus Algorithm). By adoption of the method provided by the technical scheme of the invention, the bit error rate and the demodulation loss are reduced.

Description

technical field [0001] The invention belongs to the field of satellite communication for high-speed data transmission, and in particular relates to a synchronous equalization method in a high-speed data transmission system, and further relates to a synchronous equalization method in a broadband satellite communication high-speed data transmission system. Background technique [0002] In recent years, high-speed data transmission technology has been highly valued in the fields of deep space communication, aerospace measurement and control, remote sensing, satellite communication, etc., and has been rapidly developed and widely used. With the development of information technology, the requirements for information transmission rate in various fields are constantly increasing, and the key technology of the corresponding demodulation terminal has become the focus of development. In a high-speed digital transmission system, the timing synchronization, carrier synchronization and e...

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Problems solved by technology

[0005] Aiming at the synchronization and equalization problem of the received signal in the traditional high-speed digital transmission satellite communication system, the present invention provides a synchronization and equalization method in the high-speed digital transmission system, that is, the joint optimization technology of demodulator timing synchronization, carrier synchronization and broadband equalization. The existing broadband satellite communication high-speed data transmission demodulation architecture, from the perspective of recovering the original signal more accurately, provides a joint optimization design method with better system optimization performance for the high-speed data transmission system in broadband satellite communication, which is effective Improve the applicability of the algorithm and reduce the system demodulation loss

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