Rapid PDCCH blind detection method based on pruning SCL polar code decoding

Abstract

The invention provides a rapid PDCCH blind detection method based on pruning SCL polar code decoding. The method comprises the following steps of: determining a search space type; calculating the initial position of the CCEs candidate set under the aggregation level, and obtaining the length and position of the whole CCE candidate set according to the CCE aggregation degree; carrying out demodulation, descrambling and rate de-matching on the CCEs candidate set; carrying out polar code decoding; calculating a bit LLR value; calculating PM; performing path expansion on the current bit; performing path pruning; and when N bit decoding is finished, enabling that the path corresponding to the maximum PM passes CRC verification, correct DCI is obtained if verification succeeds, and blind detection of the PDCCH is finished. According to the method, after the CCEs candidate set is selected by applying the proper blind detection process algorithm, the provided pruning SCL polar code decoding algorithm is adopted, and then CRC verification is performed, so that the performance is stable, and the blind detection efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a fast PDCCH blind detection method based on pruned SCL polar code decoding. Background technique [0002] In the 5G system, the Physical Downlink Control Channel (PDCCH) is the controller for scheduling uplink and downlink resources of the system, and carries the downlink control information (DCI) of one or more terminals (User Equipment, UE). . The DCI message includes two important messages: one is public control information, including system messages, paging messages, etc.; the other is UE-specific messages, including: uplink power control, downlink resource allocation, user authorization, physical random access response, etc. When the base station sends a message to the UE terminal, due to the large number of UE terminals, the constraints of hardware computing resources, delay and power consumption on the UE side, and the lack of unlimited resources, in order t...

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Problems solved by technology

[0005] In order to improve the efficiency of blind detection, in order to improve the process of blind detection, the traditional exhaustive search method detects each CCEs candidate set sequentially from the aggregation level from low to high or from high to low. In extreme cases, it is necessary to complete the detection All aggregation levels and all CCEs candidate sets, this method is simple, but the blind detection efficiency is very low; the feedback blind detection scheme uses the Channel Quality Indicator (CQI) reported by the UE to determine the aggregation level of the current blind detection , but it is greatly affected by the quality of the channel and its performance is unstable; the blind detection scheme based on spectrum sensing uses spectrum sensing to eliminate invalid PDCCH candidate sets and reduce the number of PDCCH blind detections, which is greatly affected by the communication environment and is prone to errors Judgment

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