计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2015年
5期
71-74
,共4页
电力线载波通信%自适应迭代译码%置信传播算法%Middleton A类信道%重复累积码
電力線載波通信%自適應迭代譯碼%置信傳播算法%Middleton A類信道%重複纍積碼
전력선재파통신%자괄응질대역마%치신전파산법%Middleton A류신도%중복루적마
Power Line Communication(PLC)%adaptive and iterative algorithm%belief propagation algorithm%Middleton class-A model%repeat accumulate code
为降低信息在强干扰电力线信道中传输的误码率，对重复累积（RA）码的置信传播（BP）译码算法进行改进。修正BP译码算法中信息节点的初始值，利用自适应迭代译码减少译码过程中的迭代次数，并对译码进行预判决，降低了RA码译码复杂度、提高了译码效率。在Middleton A类电力线信道模型下仿真结果表明：改进后的译码方法在低信噪比区域与BP算法性能相近，而在较高信噪比区域改进后的算法与BP译码算法相比所需信噪比少约0.8 dB，并且显著减少了译码过程中的迭代次数。
為降低信息在彊榦擾電力線信道中傳輸的誤碼率，對重複纍積（RA）碼的置信傳播（BP）譯碼算法進行改進。脩正BP譯碼算法中信息節點的初始值，利用自適應迭代譯碼減少譯碼過程中的迭代次數，併對譯碼進行預判決，降低瞭RA碼譯碼複雜度、提高瞭譯碼效率。在Middleton A類電力線信道模型下倣真結果錶明：改進後的譯碼方法在低信譟比區域與BP算法性能相近，而在較高信譟比區域改進後的算法與BP譯碼算法相比所需信譟比少約0.8 dB，併且顯著減少瞭譯碼過程中的迭代次數。
위강저신식재강간우전력선신도중전수적오마솔，대중복루적（RA）마적치신전파（BP）역마산법진행개진。수정BP역마산법중신식절점적초시치，이용자괄응질대역마감소역마과정중적질대차수，병대역마진행예판결，강저료RA마역마복잡도、제고료역마효솔。재Middleton A류전력선신도모형하방진결과표명：개진후적역마방법재저신조비구역여BP산법성능상근，이재교고신조비구역개진후적산법여BP역마산법상비소수신조비소약0.8 dB，병차현저감소료역마과정중적질대차수。
In order to reduce the bit error rate of message transmission in strong interference channel of power line, a modified algorithm based on belief propagation algorithm for repeat accumulate code is proposed, which through revising the initial value of the information nodes, making use of adaptive and iterative decoding to reduce the number of itera-tions, and pre-judging whether decoding operation is finished, thus reducing the decoding complexity and the decoding effi-ciency is improved, too. The simulation under Middleton class-A model shows that the BP algorithm after modification has a performance close to the BP decoding algorithm in the area of low SNR, but in the area of high SNR, the modified algorithm has about 0.8 dB gain than BP algorithm, besides, the iteration times in the decoding process are notably decreased.
