Joint Virtual User Identification and Channel Security En/Decoding Method for Ad hoc Networks
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摘要:
Ad hoc网络是一种无中心的自组织网络，由于用户能量受限当信噪比较低时有效用户识别的可靠性和信道安全性下降。该文针对这个问题提出一种联合有效用户识别与信道安全编译码方法。将发送用户的正交地址码与接收用户的伪随机地址码异或产生基于发送用户与接收用户的有效用户识别码。为提高信道安全性以信道安全码作为密钥加密有效用户识别码得到正交随机安全序列。为实现扩频并提高传输效率将发送数据以6 bit信息作为一个符号进行分组，将每个符号与一个正交随机安全序列对应。接收用户采用基于子空间的方法处理接收信号，通过建立判决模型识别有效用户。实验结果表明该方法与已有方法相比，当有效用户识别的漏警概率为10–3时信噪比增益改善1.6 dB。
Abstract:Ad hoc network is a kind of self-organized network without center. The reliability of virtual user identification and channel security are reduced when SNR is low due to user energy limitation. In order to solve this problem, a joint virtual user identification and channel security en/decoding method is proposed in this paper. Transmitter-receiver-based virtual user identification code is generated by xoring the orthogonal address code of transmitter with the pseudo random address code of receiver and encrypted with channel security code as key to acquire orthogonal random secure sequence so as to improve channel security. In order to realize spread spectrum as well as improve transmission efficiency, transmitted data is divided into 6-bit symbols, each symbol is mapped with an orthogonal random secure sequence. Receivers adopt subspace-based method to process received data and establish a judgment model to identify virtual users. Simulation results indicate that the proposed method obtains 1.6 dB
\begin{document}${{E_b}}/{{N}}_0$\end{document} gains compared with existing methods when miss alarm rate of virtual user identification is 10–3.
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图 6
${E_{\rm{b}}}/{N_{\rm{0}}} = - 5\;{\rm{dB}},Q = 20,24,28,32$ 时本文方法的漏警概率，虚警概率与${d_{{\rm{th}}}}$ 的关系表 1 沃尔什码表
编号 沃尔什码 1 0110100110010110100101100110100110010110011010010110100110010110 2 0011001111001100110011000011001111001100001100110011001111001100 $ \vdots $ $ \vdots $ 64 0110011001100110011001100110011001100110011001100110011001100110 
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表 2 M序列表
编号 M序列 1 1101111110101110001100111011000000111100100101010011010000100010 2 1011111101011100011001110110000001111001001010100110100001000101 $ \vdots $ $ \vdots $ 64 0101101111110101110001100111011000000111100100101010011010000100
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表 3 信道安全码表
编号 信道安全码 1 1001110111000111111110001010110010101011101000110101000100101000 $ \vdots $ $ \vdots $ 64 0101100010010101011001110111100101001001011001010010001010001001
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表 4 正交随机安全序列表
6 bit符号 正交随机安全序列 000000 0100101100001101000010011010010101000100111000000101000011111011 $ \vdots $ $ \vdots $ 111111 1000111001011111100101100111000010100110001001100010001101011010
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