Blind decoding method for reducing blind decoding times of PDCCH (Physical Downlink Control Channel) based on polar codes

Abstract

The invention provides a blind decoding method for reducing blind decoding times of PDCCHs (Physical Downlink Control Channels) based on polar codes and belongs to the field of communication. According to the method, before polarization coding is carried out, maximum values of two DCI (Downlink Control Information) lengths under a current transmission mode are calculated and unified, moreover, two possible DCI formats are distinguished through setting of a one-bit flag bit, and CRC check bits are added behind the information with the flag bit, thereby obtaining an information sequence participating in the polarization coding. Codon sequences transmitted by the PDCCHs are obtained through punching polarization coding according to a PDCCH aggregation level required by a high-level signal. In a blind decoding process of a user side, an information bit length output through decoding is calculated according to a transmission mode, a PDCCH sequence consistent with a current user identity is screened through a CASCL decoding algorithm, the final DCI information length is determined according to flag bits in a decoding result, and control information is extracted. According to the blind decoding method provided by the invention, on the premise of not improving an original decoding error rate, the decoding times is effectively reduced, the system efficiency is improved, and the practical application is facilitated.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a polar code-based blind detection scheme and a downlink control channel information transceiving link for reducing the number of times of blind detection of a physical downlink control channel. Background technique [0002] The downlink control channel is an important part of the downlink of the LTE system, in which the physical downlink control channel (PDCCH, Physical Downlink Control Channel) carries downlink control information (DCI, Downlink Control Information), including scheduling information for downlink and uplink data transmission And uplink power control information, etc. In order to realize the flexible selection of the code rate, the base station can choose to use 1, 2, 4 or 8 control channel elements (CCE, ControlChannel Element) to carry a DCI, which is called CCE aggregation level. The four aggregation levels 1, 2, 4, and 8 correspond to the four PDCCH for...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing blind detection improvement methods have certain limitations and poor versatility. It is necessary to design a new blind detection scheme that uses polar codes as channel coding methods with strong versatility and can effectively reduce the number of detections.

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