| Polar Code is a channel coding scheme that can reach Shannon limit theoretically,and it has been studied widely because of its excellent decoding performance.In the 5th Generation of Mobile Wireless System,Polar Code is used as the channel coding scheme of PDCCH and PBCH.Traditional SC and SCL decoding algorithms have the problems of redundant operation and excessive decoding delay.It's an important research direction of decoding algorithm to ensure the validity and reliability of data transmission and reduce the redundancy and complexity of decoding.Thesis is funded by the special key technology innovation project of Chongqing's key industries.a major project in Chongqing.this thesis studies the existing Polar Code decoding algorithm,and proposes corresponding improvements to the existing algorithm to reduce the complexity and delay of decoding algorithm.The main contents and innovations of the paper include:1.In this thesis,three new types of nodes are proposed,the decoding expressions of the new nodes are proved by mathematical method,and the fast decoding methods of different nodes are given.The fast decoding method of new nodes avoids traversal of child nodes and eliminates redundancy.Through theoretical analysis,the clock consumption of these three specific code types is reduced from t-2,t-2,2t-5 to 1,1 or 2,1.MATLAB software simulation shows that the fast SC decoding method for three new nodes can reduce the decoding delay without changing the bit error rate.2.Combining the traditional SCL decoding algorithm and three new fast SC decoding methods of nodes,a fast SCL decoding method for three new nodes is proposed.Through theoretical analysis,the clock consumption of these three new types of nodes was reduced from(?) to 2,2,1+min(L-1,R-4).Simulation results show that the three new fast SCL decoding methods are correct.3.The whole process of PBCH parsing was analyzed.Combining with the project,the PBCH parsing was implemented on FPGA. |
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