新型LT碼編譯碼方法及其在認(rèn)知無(wú)線電中的應(yīng)用

姚渭箐; 易本順

doi:10.11999/JEIT180427

新型LT碼編譯碼方法及其在認(rèn)知無(wú)線電中的應(yīng)用

doi: 10.11999/JEIT180427

姚渭箐^{1, 2, ,},
易本順²

1.
國(guó)網(wǎng)湖北省電力有限公司信息通信公司 ??武漢 ??430077
2.
武漢大學(xué)電子信息學(xué)院 ??武漢 ??430072

基金項(xiàng)目: 國(guó)家自然科學(xué)基金(61371125)，深圳市基礎(chǔ)研究項(xiàng)目(JCYJ20150630153917254)

詳細(xì)信息

作者簡(jiǎn)介:
姚渭箐：女，1983年生，博士，工程師，研究方向?yàn)闊o(wú)線通信、信道編碼

易本順：男，1965年生，博士，教授，博士生導(dǎo)師，研究方向?yàn)槎嗝襟w網(wǎng)絡(luò)通信、信源信道編碼、無(wú)線通信、光電信息系統(tǒng)

通訊作者:
姚渭箐　ywq1005@whu.edu.cn

中圖分類號(hào): TN911.22
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- 文章訪問(wèn)數(shù): 2014
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- 被引次數(shù): 0
出版歷程
- 收稿日期: 2018-05-07
- 修回日期: 2018-10-15
- 網(wǎng)絡(luò)出版日期: 2018-10-30
- 刊出日期: 2019-03-01

A Novel Encoding and Decoding Method of LT Codes and Application to Cognitive Radio

Weiqing YAO^{1, 2
, ,},
Benshun YI²

1.
State Grid Hubei Information & Telecommunication Company Limited, Wuhan 430077, China
2.
School of Electronic Information, Wuhan University, Wuhan 430072, China

Funds: The National Natural Science Foundation of China (61371125), The Basic Research Project of Shenzhen (JCYJ20150630153917254)

摘要

摘要:
Luby變換(LT)碼作為一種抗干擾編碼技術(shù)，應(yīng)用于認(rèn)知無(wú)線電系統(tǒng)，可提高次用戶數(shù)據(jù)傳輸?shù)目煽啃浴＞幾g碼是影響LT碼抗干擾性能的關(guān)鍵因素。為提高數(shù)據(jù)傳輸?shù)目煽啃院退俣?，該文提出一種適用于認(rèn)知無(wú)線電系統(tǒng)的LT碼聯(lián)合泊松魯棒孤子分布-疊層(CPRSD-H)編譯碼算法。編碼過(guò)程中，編碼器首先采用CPRSD進(jìn)行編碼產(chǎn)生編碼分組和編碼矩陣，隨后通過(guò)編碼矩陣中度數(shù)為1和度數(shù)為2對(duì)應(yīng)的列向量攜帶雙層信息：度數(shù)為1和度數(shù)為2的編碼分組和與其相連接的輸入分組的連接關(guān)系；部分原始數(shù)據(jù)信息。譯碼過(guò)程中，譯碼器首先通過(guò)第1層存儲(chǔ)信息采用置信傳播(BP)算法譯碼完成，隨后一些未被成功譯出的信息再通過(guò)第2層存儲(chǔ)信息進(jìn)行填補(bǔ)。仿真結(jié)果表明，將CPRSD-H編譯碼算法應(yīng)用于認(rèn)知無(wú)線電系統(tǒng)中，能夠顯著降低LT碼的誤比特率(BER)，提高次用戶有效吞吐量以及加快LT碼編譯碼速度。
- 認(rèn)知無(wú)線電 /
- Luby變換碼 /
- 疊層編譯碼算法 /
- 聯(lián)合泊松魯棒孤子分布 /
- 有效吞吐量
Abstract:
As an efficient anti-interference technique, Luby Transform (LT) codes are applied to cognitive radio systems for reliable data transmission of secondary users. Encoding and decoding are critical issue for the anti-interference performance of LT codes. To improve the reliability and speed of data transmission, a novel encoding and decoding method Combined Poisson Robust Soliton Distribution-Hierarchical (CPRSD-H) for LT codes is proposed to apply to cognitive radio systems. In the process of encoding, the encoder first produces encoded symbols and generator matrix based on CPRSD, and then uses column vectors corresponding to degree–1 and degree–2 in the generator matrix to carry dual information: the relationship between the degree–1 and degree–2 encoded symbols and their connected input symbols; and part of the original data. Contrarily, in the decoding process, the decoder first uses the Belief Propagation (BP) algorithm to decode by the first information, and then correct some unrecovered bits by the second information. Simulation results show that the proposed method CPRSD-H and application to cognitive radio systems can significantly reduce the Bit Error Rate (BER) of LT codes, the goodput performance of secondary users and the encoding and decoding speed of LT codes.
- Cognitive radio /
- Luby Transform (LT) codes /
- Hierarchical encoding and decoding /
- Combined Poisson Robust Soliton Distribution (CPRSD) /
- Goodput

HTML全文

圖 1 次用戶在認(rèn)知無(wú)線電系統(tǒng)中傳輸?shù)南到y(tǒng)模型

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圖 2 LT碼編譯碼過(guò)程

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圖 3 疊層編碼方法

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圖 4 疊層譯碼方法

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圖 5 RSD-BP, RSD-H, CPRSD-BP和CPRSD-H誤比特率

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圖 6 RSD-BP, RSD-H, CPRSD-BP和CPRSD-H有效吞吐量

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圖 7 RSD-BP, RSD-H, CPRSD-BP和CPRSD-H的平均編譯碼耗時(shí)

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