資源描述:
《簡(jiǎn)單高效的低密度奇偶校驗(yàn)碼比特翻轉(zhuǎn)譯碼算法.pdf》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、JournalofComputerApplicationsISSN1001—90812014.1O一10計(jì)算機(jī)應(yīng)用,2014,34(10):2796—2799C0DENJYIIDUhttp://www.joca.cn文章編號(hào):1001—9081(2014)10—2796—04doi:10.11772/j.issn.1001—9081.2014.10.2796簡(jiǎn)單高效的低密度奇偶校驗(yàn)碼比特翻轉(zhuǎn)譯碼算法張高遠(yuǎn)。,文紅,李騰飛,宋歡歡(通信與抗干擾技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室(電子科技大學(xué)),成都611731)(通信作者電子郵箱zhanggaoyuan407@163.corn)摘要:
2、為了提高比特翻轉(zhuǎn)(BF)效率,提出一種基于平均幅度的低密度奇偶校驗(yàn)(LDPC)碼加權(quán)梯度下降比特翻轉(zhuǎn)譯碼算法。該方法首先以信息節(jié)點(diǎn)的平均幅度作為校驗(yàn)方程的可靠度,再用其對(duì)雙極性校驗(yàn)子進(jìn)行加權(quán),從而構(gòu)造出更加高效的比特翻轉(zhuǎn)函數(shù)。在加性高斯白噪聲(AWGN)信道下,誤比特率(BER)為l0時(shí)進(jìn)行仿真實(shí)驗(yàn),相比傳統(tǒng)的梯度下降和基于可靠度比率的加權(quán)梯度下降比特翻轉(zhuǎn)算法,所提出的算法可分別獲得0.08dB和0.29dB的增益;同時(shí),平均迭代次數(shù)可分別降低72.6%和9.3%。實(shí)驗(yàn)結(jié)果表明,所提算法在獲得一定編碼增益的同時(shí),平均迭代次數(shù)也有所降低,可見(jiàn)該算法在糾錯(cuò)性能、實(shí)現(xiàn)復(fù)雜度
3、和時(shí)延之間達(dá)到了更好的平衡匹配,能適用于實(shí)時(shí)性要求較高的高速通信系統(tǒng)。關(guān)鍵詞:低密度奇偶校驗(yàn)碼;加權(quán)梯度下降;平均幅度;可靠度比率;比特翻轉(zhuǎn)中圖分類號(hào):TN911.2l文獻(xiàn)標(biāo)志碼:ASimpleeficientbit-flippingdecodingalgorithmforlowdensityparitycheckcodeZHANGGaoyuan,WENHong,LITengfei,SONGHuanhuan(NationalKeyLaboratoryofScienceandTechnologyOnCommunications(UniversityofElectroni
4、cScienceandTechnologyofChina),ChengduSichuan611731,China)Abstract:ToimprovetheefficiencyoftheBitFlipping(BF),aweightedgradientdescentbit-flippingdecodingalgorithmbasedonaveragemagnitudewasproposedforLowDensityParityCheck(LDPC)code.Theaveragemagnitudeoftheinformationnodeswasfirstintroduc
5、edasthereliabilityoftheparitychecks,whichwasusedtoweighthebipolarsyndrome,andthenanefectivebit.flippingfunctionwasobtained.SimulationWasconductedatBit.ErrorRatefBER)of10一underanAdditiveWhiteGaussianNoise(AWGN)channel,andcodinggainsof0.08and0.29dBwereachievedincomparisontoconventionalwei
6、ghtedGradientDescentBit-Flipping(GDBF)andReliabilityRatiobasedWeightedGradientDescentBit—Flipping(RRWGDBF)algorithmswhiletheaveragenumberofdecodingiterationswasreducedby72.6%and9.3%,respectively.Thesimulationresultsshowthattheimprovedalgorithmoutperformstheconventionalalgorithmswhileave
7、ragedecodingnumberiSalSOreduced.Itindicatesthatthisnewschemecanbetterbalanceerror—corectingability.decodingcomplexityanddelay,whichcanbeappliedtohigh·speedcommunicationsystemwithhighreal—timerequirement.Keywords:LowDensityParityCheck(LDPC)code;weightedgradientdescent;averagemag