Method and device for channel estimation and equalization of receiving end in satellite communication

Abstract

The invention provides a method and a device for channel estimation and equalization of a receiving end in satellite communication. The method comprises: performing correlation operation on unique character symbols of an extracted burst signal and stored local unique character symbols; according to configured pre-processing parameters, calculating a channel estimation result obtained by the correlation operation, to obtain a plurality of groups of channel equalization coefficients; compensating each group of the channel equalization coefficients to the burst signal; respectively performing demapping and decoding operation on each channel equalization result obtained by compensation, to obtain a plurality of decoding results; selecting an optimal decoding result from the plurality of decoding results, and using information bits corresponding to the optimal decoding result as final burst decoding output. The plurality of groups of channel equalization coefficients are used to perform channel equalization, demapping and decoding operation on burst, and the most reliable decoding result is selected from the decoding results. In a burst communication system, aimed at burst that only few know symbols exist, the method and the device can accurately and reliably perform channel estimation and equalization, and effectively receives bursts of the kind.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a method and device for channel estimation and equalization at a receiving end in satellite communication. Background technique [0002] Channel estimation and equalization technology is an important problem that almost any communication system needs to solve today, and its performance can determine the communication capability of the entire communication system. As the current communication environment is becoming more and more complex, such as signals in various frequency bands, reflections of various objects, and fast movement of terminals, etc., can cause serious deterioration of received signals, so channel estimation and equalization technology basically belongs to the receiving terminal in this case. Required technical components. [0003] Many existing channel estimation and equalization techniques are performed using known information symbols (also called known sy...

AI Technical Summary

Problems solved by technology

At present, the estimation accuracy of many channel estimation methods is related to the number of known information symbols. The more known information symbols, the higher the estimation accuracy and the better the reception performance. However, the increase of known information symbols will also Reduce the transmission efficiency of useful information, so in actual communication, the number of known information symbols in a burst signal must be strictly controlled

[0004] In practice, for short bursts in the system, generally the proportion of known symbols will not be too large, otherwise the transmission efficiency will be seriously affected

There are fewer known symbols, which will bring difficulties in improving the accuracy of channel estimation and equalization. For example, the TCH3 burst in the GMR-1 system only occupies 3 time slots, and the known symbol length is only one period, and only 6 modulations symbol length

[0005] The inventor found in the research that for the aforementioned shorter bursts (such as TCH3 bursts), the accuracy achieved by the existing channel estimation and equalization methods is very limited, and the reliability of the signals received by such bursts cannot be guaranteed.

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