本文關(guān)鍵詞：幾種新擴頻碼的構(gòu)造及其性能分析　出處：《西安郵電大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 擴頻通信 三元組擴頻碼 混沌-AR自編碼 相空間-AR自編碼

【摘要】：如今信息化時代步伐加快,信息安全在軍事通信中的作用越來越重要,人們對傳輸信息的要求越來越高,鑒于擴頻通信具有良好的保密性、抗截獲和抗干擾能力,以及碼分多址等優(yōu)點,目前擴頻通信在民用通信、軍事通信中的應用越來越多。直接序列擴頻通信系統(tǒng)成為了一種技術(shù)最成熟、應用最廣泛的擴頻通信方式,在直擴通信系統(tǒng)中,通信系統(tǒng)符號間干擾的大小和多址干擾的強度很大程度上取決于擴頻碼序列特性的優(yōu)劣,導致系統(tǒng)性能受到直接影響。因此,對擴頻序列性質(zhì)的深入研究、尋找具有優(yōu)良性能擴頻序列的設(shè)計方案是直擴通信系統(tǒng)的核心課題,同時成為本論文的主要研究內(nèi)容。本論文首先介紹了擴頻通信理論的發(fā)展、擴頻通信的基礎(chǔ)知識及其相關(guān)理論。其次,從不同的角度分類、討論了擴頻碼序列,著重研究了三元組擴頻序列、混沌理論、自編碼擴頻通信系統(tǒng)及其改進序列的設(shè)計方法,本文取得的主要研究成果如下：第一,首先簡要介紹擴頻技術(shù),然后以序列生成器的不同作為區(qū)分擴頻序列的主要手段,研究了不同種類的擴頻序列的優(yōu)缺點,總結(jié)出擴頻碼應具備的優(yōu)良特性,以便為新擴頻序列的提出做準備。擴頻序列應具備良好的自相關(guān)性、互相關(guān)性、平衡性、游程性、復雜性和混沌性等基本的數(shù)學統(tǒng)計特性,最后本文給予了簡明扼要的分析。第二,簡要介紹了由用戶的輸入信息、選擇的廣義信息作為初值和背景、空間軌跡變換作為算法的三元組隨機數(shù)序列,對該體制新穎的序列進行經(jīng)典正交變換和均勻同態(tài)變換,獲得互相關(guān)性好的正交三元組擴頻碼和隨機性高的同態(tài)三元組擴頻碼。然后性能測試并驗證分析正交三元組擴頻序列和同態(tài)三元組擴頻碼的相關(guān)性、平衡度和Lyapunov指數(shù),以及在直擴通信系統(tǒng)中的誤碼率,結(jié)果表明：三元組擴頻碼的性能優(yōu)良,并且誤碼率較低,尤其是正交三元組擴頻序列的誤碼率最低,可以替代PN序列作為擴頻通信系統(tǒng)的擴頻碼。第三,簡要介紹從信源信息序列中獲取擴頻碼的自編碼擴頻通信系統(tǒng),研究了混沌映射、二維離散超混沌映射與自編碼擴頻序列融合的方式,以及相空間軌跡重構(gòu)法改進自編碼擴頻序列的方式,基于AR自編碼擴頻序列獲取了混沌-AR自編碼擴頻序列、超混沌-AR自編碼擴頻序列和相空間-AR自編碼擴頻序列,通過軟件仿真同時分析檢驗擴頻序列的性能和傳輸誤碼率。第四,利用多用戶通信系統(tǒng)模型,在高斯白噪聲信道和瑞利信道中仿真論文提出的擴頻碼和傳統(tǒng)擴頻序列在不同信噪比下的誤碼率。同時驗證了不同擴頻增益下各種擴頻碼的誤碼率差別很大,隨著擴頻增益的提高,通信系統(tǒng)的誤碼率明顯降低。本文提出的擴頻序列較傳統(tǒng)擴頻碼有較強的復雜度和隨機性,可以提高通信系統(tǒng)的安全性以及傳輸信息的抗截獲性。若以傳輸信息的誤碼率作為評價擴頻序列的主要指標,則相空間AR自編碼擴頻序列是本文擴頻碼中最優(yōu)的,然后分別是超混沌-AR自編碼擴頻序列、混沌-AR自編碼擴頻序列和正交三元組擴頻碼,相對較差的是同態(tài)三元組擴頻碼。
[Abstract]:Now the information age to accelerate the pace of information security becomes more and more important in military communication, people transmit information on the increasingly high demand, in view of the spread spectrum communication has a good security, anti interception and anti-jamming ability, and the advantages of CDMA spread spectrum communication in civil communication, at present, more and more applications in the military communication. Direct sequence spread spectrum communication system has become a kind of spread spectrum communication technology is the most mature, the most widely used, in DSSS communication system, communication system, intersymbol interference and multiple access interference intensity size depends largely on the sequence characteristics of the pros and cons, make the performance of the system directly affected. Therefore, further study on the properties of the spreading sequence, find the design scheme with good performance of spread spectrum sequence is the core issue of DSSS communication system, and become the main research of this paper. Volume. This paper first introduces the development of the theory of spread spectrum communication, the theory of spread spectrum communication and related theories. Secondly, the classification from different angles, discusses the spreading sequence, focuses on the three tuple sequence, chaos theory, self encoding in spread spectrum communication system and its design method to improve the sequence, the main achievement of the thesis are as follows: first, briefly introduces the spread spectrum technology, the main means and in different as the sequence generator distinguish the spreading sequence, the advantages and disadvantages of different kinds of spread spectrum sequence, summed up the excellent characteristics of the spreading codes should have, in order to put forward a new spreading sequence ready. Spread spectrum sequence should have good correlation, cross correlation, balance, run length, mathematical statistics and other basic complexity and chaos, finally this paper gives a concise and to the point analysis. Second, brief introduction From the user's input information, select the generalized information as the initial condition and background, the space trajectory transform as the three tuple sequence of random number algorithm, classical orthogonal transform and homomorphic transform of uniform sequence of the new system, obtain the cross-correlation orthogonality of the three tuple spreading codes and random spreading codes three tuple high homomorphism the performance test and verification. Then correlation analysis of orthogonal spreading sequences and three tuple homomorphism of three tuple codes, balance degree and Lyapunov index, as well as in DSSS communication system BER, the results show that the performance of the three tuple codes are excellent, and the bit error rate is low, especially the error of three tuple orthogonal sequences the lowest rate, can replace the PN sequences as spreading codes in spread spectrum communication system. Since Third, encoding in spread spectrum communication system are briefly introduced from the source information in the sequence acquisition of spread spectrum codes, were investigated Chaos mapping, two-dimensional discrete hyperchaotic mapping and fusion self encoding sequence, and the phase space trajectory reconstruction method improves the self encoding sequence, obtained by AR chaotic spread spectrum sequence encoding -AR from self encoding sequences based on chaotic spread spectrum sequence and -AR encoding phase space -AR encoding sequence by software the simulation and analysis of performance and BER Test sequence. Fourth, multi user communication system model, the Gauss white noise channel and Rayleigh channel simulation of the spread spectrum code and traditional spread spectrum sequence in BER under different SNR. At the same time to verify the different spreading gain error of various PN code rate very different, with spread spectrum gain increases, the error rate of communication system is reduced obviously. The spread spectrum sequence is proposed in this paper compared with the traditional spreading codes have complexity and randomicity, Can improve the anti interception of communication system security and transmission of information. If the information transmission error rate as the main index to evaluate the spreading sequence, then phase space AR encoding spread spectrum sequence is the spreading codes in the best, then is -AR chaotic spread spectrum sequence self encoding, -AR encoding and chaotic spread spectrum sequence three tuple orthogonal spreading codes, the relatively poor is homomorphic three tuple spreading codes.

【學位授予單位】：西安郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN914.42

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本文編號：1391994