电讯技术
電訊技術
전신기술
TELECOMMUNICATIONS ENGINEERING
2013年
10期
1317-1320
,共4页
低密度格码%功率受限%标记位整形%最小和算法
低密度格碼%功率受限%標記位整形%最小和算法
저밀도격마%공솔수한%표기위정형%최소화산법
low-density lattice code%limited power%sign bit integer shaping%min-sum algorithm
为解决低密度格码( LDLC)编码后码字不能适用于功率受限信道的问题，提出了一种基于标记位的LDLC码整形算法。该算法结合标记位整形思想，针对LDLC码的特点，通过最小和算法求解出平均功率最小的信息序列。分析并仿真了整形前后信息功率的变化及取得的整形增益。实验结果显示：整形后的码字功率明显小于整形前的功率，可达到0.53 dB的整形增益，同时该整形算法接收端逆整形简单。
為解決低密度格碼( LDLC)編碼後碼字不能適用于功率受限信道的問題，提齣瞭一種基于標記位的LDLC碼整形算法。該算法結閤標記位整形思想，針對LDLC碼的特點，通過最小和算法求解齣平均功率最小的信息序列。分析併倣真瞭整形前後信息功率的變化及取得的整形增益。實驗結果顯示：整形後的碼字功率明顯小于整形前的功率，可達到0.53 dB的整形增益，同時該整形算法接收耑逆整形簡單。
위해결저밀도격마( LDLC)편마후마자불능괄용우공솔수한신도적문제，제출료일충기우표기위적LDLC마정형산법。해산법결합표기위정형사상，침대LDLC마적특점，통과최소화산법구해출평균공솔최소적신식서렬。분석병방진료정형전후신식공솔적변화급취득적정형증익。실험결과현시：정형후적마자공솔명현소우정형전적공솔，가체도0.53 dB적정형증익，동시해정형산법접수단역정형간단。
In order to solve the problem that the Low Density Lattice Codes( LDLC) cannot be applied in power limited channels, an LDLC shaping algorithm based on sign bits is proposed. Based on the algorithm of sign bits shaping and combined with the characteristic of low density lattice codes,this algorithm solves the minimizing average power information sequence by the min-sum algorithm. The shaping gain and the information power changes before and after shaping are analized. The simulation result shows that after sha-ping the code power is significantly less than that before shaping. The shaping gain is up to 0. 53 dB. At the same time, it is simple to realize inverse shaping at receiver by using this method.
