【摘要】：傳統(tǒng)協(xié)作通信常采用譯碼轉(zhuǎn)發(fā)(DF)協(xié)議。而該協(xié)議在源-中繼節(jié)點鏈路通信質(zhì)量較差情況下,易出現(xiàn)誤碼傳播現(xiàn)象。為了改進(jìn)該問題,該文提出可應(yīng)用于編碼協(xié)作(CC)機(jī)制的Raptor編碼協(xié)作方案,其可在高信噪比下獲得較大編碼增益和滿分集增益。它在源節(jié)點和中繼節(jié)點使用不同Raptor編碼,使中繼節(jié)點新編碼碼字為源節(jié)點碼字的部分校驗信息,使接收端所得碼字獨立不等。因此,目的節(jié)點在分別接收來自不同獨立鏈路消息后,可根據(jù)碼字間固有關(guān)系聯(lián)合譯碼,以獲得額外發(fā)送空間分集增益。為了降低復(fù)雜度,Raptor碼的預(yù)編碼還可采用整數(shù)序列構(gòu)造的準(zhǔn)循環(huán)低密度奇偶校驗(QC-LDPC)碼,從而獲得較低線性預(yù)編碼復(fù)雜度。仿真表明:在誤比特率(BER)為10-4時,所提Raptor編碼協(xié)作方案較傳統(tǒng)DF協(xié)議Raptor方案,Raptor與分布式空時分組碼(DSTBC)結(jié)合方案,分別有2 d B和1 dB增益。此外,當(dāng)中斷概率為10~(-2)時,其性能較CC,DF協(xié)作方案提高了約2 dB和7 d B。
[Abstract]:Traditional cooperative communication often adopts decoding and forwarding (DF) protocol. The protocol is prone to error propagation when the communication quality of the source-relay link is poor. In order to improve this problem, this paper proposes a Raptor coding cooperation scheme which can be applied to the coding cooperative (CC) mechanism. It can obtain large coding gain and full diversity gain under high SNR. It uses different Raptor codes in the source node and the relay node so that the new coded codeword of the relay node is part of the check information of the source node codeword so that the received codeword varies independently. Therefore, after receiving the messages from different independent links separately, the destination node can be decoded jointly according to the inherent relationship between the codewords to obtain additional transmit space diversity gain. In order to reduce the complexity, the precoding of Raptor codes can also use quasi-cyclic low-density parity-check (QC-LDPC) codes constructed by integer sequences to obtain lower linear precoding complexity. Simulation results show that when the bit error rate (BER) is 10 ~ (-4), the proposed Raptor coding cooperation scheme has 2 dB and 1 dB gain, respectively, compared with the traditional DF protocol Raptor scheme, Raptor and distributed space-time block code (DSTBC) scheme. In addition, when the outage probability is 10 ~ (-2), its performance is about 2 dB and 7 dB higher than that of CC,DF.
【作者單位】： 杭州電子科技大學(xué)通信工程學(xué)院;東南大學(xué)移動通信國家重點實驗室;
【基金】：浙江省自然科學(xué)基金(LZ14F010003,LY15 F010008) 國家自然科學(xué)基金(61471152) 東南大學(xué)移動通信國家重點實驗室開放研究基金(2014D02) 浙江省公益性技術(shù)應(yīng)用研究計劃(2015C31103)~~
【分類號】：TN911.22

【相似文獻(xiàn)】

相關(guān)期刊論文 前3條

1 劉琴濤;劉宏波;馬俊凱;;Raptor碼在衛(wèi)星通信中抗干擾性能研究[J];計算機(jī)與數(shù)字工程;2013年07期

2 李青;王峰;崔慧娟;唐昆;;信源反饋條件下Raptor碼的一種解碼算法[J];信息技術(shù);2012年08期

3 ;[J];;年期

相關(guān)碩士學(xué)位論文 前2條

1 田金超;基于RAPTOR容錯模型的網(wǎng)絡(luò)可生存性研究[D];哈爾濱工程大學(xué);2006年

2 劉瓊;基于Raptor碼的多媒體推送系統(tǒng)的設(shè)計與實現(xiàn)[D];北京郵電大學(xué);2014年

，

本文編號：2295775