一种基于LDPC链路自适应技术的研究  

Study on A LDPC-based Link Adaptation Technology

作　　者：周晓宁[1] 闵芳[1] 周小林[2] 

机构地区：[1]南京航空航天大学金城学院信息工程系,江苏南京211156 [2]复旦大学通信科学与工程系,上海200433

出　　处：《通信技术》2008年第4期31-32,35,共3页Communications Technology

摘　　要：为了设计信道纠错能力强、系统频带利用率高的无线链路自适应传输技术,文中研究了基于LDPC信道纠错码的自适应编码调制OFDM系统模型以及相应的传输方案,并设计了四区间自适应OFDM通信机制;提出了利用代价函数计算传输模式切换阈值的方法。仿真显示所设计的自适应OFDM系统具有良好的链路适应能力,可以得到优化的系统频带利用率和平均误码率性能。In order to design a wireless link adaptation technology with strong channel-error correction capability and high spectral efficiency, A LDPC-based adaptive modulation coding system model and related communication scheme are studied. And the four-region adaptive OFDM system transmission scheme are designed. The corresponding mode switch thresholds are calculated by COST-based function. Simulation shows that the proposed system is of good link adaptation ability, and can achieve the optimized system spectral efficiency and average BER performance.

关 键 词：自适应编码调制 LDPC 代价函数 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]