Polarization code-based synchronization-free communication method, device and system

Abstract

The invention discloses a polarization code-based synchronization-free communication method, device and system. A receiving end adopts a combination of a plurality of groups of preset signal startingtime, modulation center frequency and channel phase, timing sampling, frequency offset correction and phase correction processing are carried out on the received signals, and after demodulation, P' code word receiving sequences are obtained; based on a divide-and-conquer thought, each P code word receiving sequences in the P' code word receiving sequences are decoded at the same time to obtain P' / P decoding results, a decoding result which is most likely to be a correct code word is selected from the obtained decoding results based on a maximum likelihood principle, the validity is judged, andif yes, information in the decoding result is extracted to complete communication. The method is not limited by the number of code word receiving sequences which can be processed by a multi-codewordreceiving sequence SCL decoder under the condition that the number of value combinations of the sampling starting position, the carrier frequency offset and the carrier phase is large, and the communication quality is high.

Description

technical field [0001] The invention belongs to the technical field of error correction coding and decoding, and more specifically relates to a polar code-based synchronization-free communication method, device and system. Background technique [0002] Synchronization is a key technical link in the communication system. Only when the sending and receiving parties are synchronized in the three aspects of signal start time, modulation center frequency and channel phase, can communication be carried out normally. In order to realize synchronous communication, the existing method embeds a synchronous sequence in the communication signal to be sent, and the synchronous sequence provides the receiver with the signal start time, modulation center frequency and channel phase of the sender. In the communication process, the synchronization sequence consumes precious channel resources and reduces the spectrum utilization efficiency. On the other hand, the use of synchronization seque...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a synchronization-free communication method, device and system based on polar codes. When the number of phase value combinations is greater than the maximum number of input codeword receiving sequences of the multi-codeword receiving sequence SCL decoder, it is impossible to decode a large number of codeword receiving sequences, resulting in poor communication quality.

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