强干扰环境下无速率随机码编译码方案及其性能分析  

Rateless Random Coding Scheme and Performance Analysis in Strong Interference Environments

作　　者：王义文 王千帆[1,2] 马啸[1,2] WANG Yiwen;WANG Qianfan;MA Xiao(School of Computer Science and Engineering,Sun Yat-sen University,Guangzhou 510006,China;Guangdong Key Laboratory of Information Security Technology,Sun Yat-sen University,Guangzhou 510006,China)

机构地区：[1]中山大学计算机学院,广州510006 [2]中山大学广东省信息安全重点实验室,广州510006

出　　处：《电子与信息学报》2024年第10期4017-4023,共7页Journal of Electronics & Information Technology

基　　金：国家重点研发计划(2021YFA1000500);国家自然科学基金(62301617);广东省自然科学基金面上项目(2023A1515011056)。

摘　　要：面向强干扰通信环境,区别于传统的无速率Luby变换(LT)码,该文提出一种基于伯努利随机构造的无速率编码方案,并在接收端采用高效的局部约束顺序统计量译码(LC-OSD)算法进行译码,从而有效对抗强干扰噪声,实现自适应超高可靠传输。为降低收发端通信资源消耗,提出了3个有效译码准则:(1)基于随机码并集(RCU)界提出的启动准则,当接收符号数大于由RCU得到的阈值时才启动译码;(2)基于软重量提出的早停准则,在译码过程中软重量超过一个预设的阈值则提前终止译码;(3)基于码字与硬判决序列比较提出的跳过准则,当新接收序列的硬判决满足重编码校验时跳过当前译码。仿真结果显示,在块删除与加性噪声混合信道下,无速率随机码的性能显著优于LT码,且因无速率码具备自适应信道质量的能力,其性能同样显著优于固定速率码。仿真结果还显示了提出的启动、早停和跳过准则能够有效降低收发端的传输资源消耗和计算复杂度。A rateless coding scheme based on Bernoulli random construction is proposed for strong interference communication environments,which differs from the traditional Luby Transform(LT)rateless codes.The scheme utilizes the Locally Constrained Ordered Statistic Decoding(LC-OSD)algorithm at the receiver to effectively combat strong interference noise and achieve adaptive and ultra-reliable transmission.To reduce the communication resource consumption at both the transmitter and receiver,three effective decoding criteria are proposed:(1)a startup criterion based on the Random Code Union(RCU)bound,which initiates decoding only when the number of received symbols exceeds a threshold derived from RCU;(2)an early stopping criterion based on soft weights,which stops decoding early when the soft weights exceed a preset threshold;and(3)a skipping criterion based on the comparison between the codeword and the hard decision sequence,which skips the current decoding process when the hard decision of the newly received sequence satisfies the recoding check.Simulation results show that the performance of the rateless random codes is significantly better than that of LT codes in a channel with block erasures and additive noise.Moreover,due to the adaptive to channel quality capability of rateless codes,their performance is also significantly better than fixed-rate codes.The simulation results also show that the proposed startup,early stopping,and skipping criteria effectively reduce transmission resources and computational complexity for both the sender and receiver.

关 键 词：顺序统计量译码 随机码 无速率码 强干扰信道 

分 类 号：TN92[电子电信—通信与信息系统]