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

A technology of polar code and number of times, which is applied in the field of communication, can solve the problems of poor versatility, achieve good compatibility, optimize the sequence of blind detection, and reduce the number of times of blind detection

Active Publication Date: 2017-11-17
BEIHANG UNIV
View PDF4 Cites 38 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Blind decoding method for reducing blind decoding times of PDCCH (Physical Downlink Control Channel) based on polar codes
  • Blind decoding method for reducing blind decoding times of PDCCH (Physical Downlink Control Channel) based on polar codes
  • Blind decoding method for reducing blind decoding times of PDCCH (Physical Downlink Control Channel) based on polar codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0030] The polar code-based blind detection method for reducing the number of PDCCH blind detection times proposed by the present invention is blind detection realized by hierarchical detection under the PDCCH channel. First, the PDCCH candidates belonging to the user are screened out through polar decoding, and on this basis The DCI information of the correct length is extracted according to the flag bit, and then the DCI format and the content of the downlink control information are determined. Utilizing the polar code frozen set feature, the sender hides the user address in the frozen set participating in the coding process during the channel coding process, and the user calculates the frozen set according to his own address when detecting the PDCCH, so each user can only correctly decode the frozen set The PDCCH that matches its own address, so it...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0038H04L1/0057
Inventor 刘荣科孙贺冯宝平
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap