Polar code non-coherent iterative detection method and device based on decision feedback

Abstract

The embodiment of the invention provides a polarization code incoherent iteration detection method and device based on decision feedback, and the method comprises the steps: receiving an information sequence output by a channel, carrying out the M-level uniform discretization of a phase rotation angle of the channel, carrying out the coherent BCJR operation, and obtaining M pieces of internal codeexternal information; Carrying out de-interleaving on the M pieces of internal code external information to obtain M pieces of external code prior information, and carrying out BP decoding operationon the M pieces of external code prior information to obtain M decoding results, M pieces of external code posterior information and M check sub-vectors; Performing decision feedback by using the check sub-vectors to obtain priori information of BP decoding; Carrying out BP decoding operation for the second time according to the priori information; And if it is judged that the decoding result obtained by the second BP decoding operation meets the stop rule of the BP decoding operation or reaches the maximum iteration frequency, calculating an estimation sequence of the original information sequence according to the decoding result. According to the embodiment of the invention, the non-coherent detection performance of the communication system can be obviously improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of digital coding and modulation, and more specifically, to a method and device for non-coherent iterative detection of polar codes based on decision feedback. Background technique [0002] With its own characteristics—theoretical proof that its performance can reach the Shannon limit, and the complexity of encoding and decoding is low—polar codes have become a hot spot in the field of encoding and decoding in the past ten years. Especially when it is included in the 5G wireless communication standard, the research on polar codes has more practical significance. However, almost all researches and applications on polar codes focus on coherent detection under AWGN channel. This means that the receiver must obtain accurate carrier phase and channel state information. However, in many practical application scenarios, for example, in a massive MIMO communication system with fast fading cha...

AI Technical Summary

Problems solved by technology

like figure 1 Shown is the structural diagram of the existing polar code iterative non-coherent detection system. When the traditional non-coherent detection method is used, the bit error performance of the system is still quite degraded compared with the coherent detection, especially at low signal In the noise ratio area, the performance degradation is more obvious

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