5G极化码译码算法理论与实现关键技术研究

项目名称： 5G极化码译码算法理论与实现关键技术研究

项目编号： No.61501116

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 张川

作者单位： 东南大学

项目金额： 20万元

中文摘要： 业务量10年提升1000倍是5G通信发展的内在基本需求。由此派生出：连续广域覆盖、热点高容量、低时延高可靠、终端大连接、设备低功耗等五个具有挑战性的需求，对信道译码算法和实现提出了前所未有的挑战。课题拟针对极化码，5G信道编码的优秀候选者之一，开展译码算法与实现的关键技术研究。课题拟：1）研究并发掘list SC译码算法潜在并行性，简化译码排序操作，最终优化译码算法时序；2）研究并规避list SC译码算法中的无效路径扩展，移除frozen bits相关运算，降低计算复杂度；3）探寻BP算法冗余环同译码性能的关系，优化软信息传递机制，建立合理终止机制，提高较低迭代次数下的译码性能；4）研究具有灵活性的译码算法，使其能在不同码长和码率、译码算法等之间合理切换；5）探索HARQ-极化码协同策略，和极化码级联译码策略。最终通过解决相关科学问题，给出适用于5G的极化码译码算法和实现的关键技术支撑。

中文关键词： 5G通信；极化码；算法优化；灵活性编译码；VLSI实现

英文摘要： According to the intrinsic demand for developing 5G mobile techniques and related industries, the network traffic will expect a thousand-fold increase within the coming 10 years. This core demand has derived five challenging requirements: continuously wide coverage, high hot-spot volume, low latency and high reliability, vast connection of user ends, and equipment low power. Those five requirements have also placed unprecedented difficulties in developing and implementing proper channel decoding algorithm for 5G. To this end, this research project plans to conduct thorough investigation on the key algorithm and implementation technologies of polar code, which ranks one of the promising candidates for 5G channel codes. We plan to: 1) uncover the hidden penalization of list SC algorithm, simplify the sorting operations, and finally refine the decoding timing; 2) avoid useless path extension, remove frozen bits related computation, lower the entire computational complexity; 3) reveal the relationship of the redundant loop within factor graph and BP decoding performance, optimize the soft message passing scheme and early stopping scheme, improve the decoding performance within limited number of iterations; 4) incorporate flexibility to polar decoding algorithm, which enables it to be fluently switched among different modes with respect to code-lengths, code rates, decoding algorithms, and so on; 5) establish HARQ-polar transmission scheme and polar concatenation decoding scheme. Based on those steps of research, we are optimistic to finally solve related scientific problems, and offer solid key theoretical and technical supports to present polar decoding algorithms and implementations to 5G communication.

英文关键词： 5G communication;polar code;algorithm optimization;flexible encoding/decoding;VLSI implementation