Method and device for channel estimation and equalization at receiver in satellite communication

Abstract

The present invention provides a method and device for channel estimation and equalization at the receiving end in satellite communication, including performing a correlation operation on the unique symbol in the extracted burst signal and the stored local unique symbol; Calculate the channel estimation results obtained by the calculation to obtain multiple sets of channel equalization coefficients; compensate each set of channel equalization coefficients into the burst signal; perform demapping and decoding operations on each channel equalization result obtained by compensation respectively, and obtain multiple sets of channel equalization coefficients. decoding results; select the best decoding result from multiple decoding results, and use the information bits corresponding to the best decoding result as the final burst decoding output, which uses multiple sets of channel equalization coefficients to channel the burst Equalization, demapping and decoding operations and select the most reliable decoding results. In burst communication systems, for bursts with fewer known symbols in bursts, channel estimation and equalization can be performed accurately and reliably, and Efficient reception of such bursts.

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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