共查询到13条相似文献,搜索用时 78 毫秒
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将有限域上GMW序列的概念推广到了一般的Galois环上.利用环上的置换,定义了一类新的一般Galois环上的GMW序列,并对其线性复杂度进行了估计.结果表明,这类GMW序列具有非常大的线性复杂度. 相似文献
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非线性扩频序列的三项式特性 总被引:5,自引:1,他引:4
讨论了三类非线性扩频序列(GMW序列、No序列和Kasami序列)的三项式特性,利用这三类序列的迹表示,证明了GMW序列、No序列和Kasami序列均具有正则三项式对。 相似文献
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GMW序列和WG序列及WG序列间的互相关特性 总被引:1,自引:0,他引:1
对于奇数n,研究了Gordon-Mills-Welch(GMW)序列与Welch-Gong(WG)序列(及其某一采样序列)间的互相关函数以及WG序列间的互相关函数。研究表明:GMW序列与WG序列(及其某一采样序列)间的互相关函数以及WG序列间的互相关函数最终均与m-序列与其采样序列间的互相关函数相关;并且在一定条件下,WG序列间的互相关函数可为3-值或5-值的。另外,给出了GMW序列与WG序列间互相关函数的最大峰值。 相似文献
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Cascaded GMW sequences 总被引:13,自引:0,他引:13
Klapper A. Chan A.H. Goresky M. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》1993,39(1):177-183
Pseudorandom binary sequences with high linear complexity and low correlation function values are sought in many applications of modern communication systems. A new family of pseudorandom binary sequences, cascaded GMW sequences, is constructed. These sequences are shown to share many desirable correlation properties with the GMW sequences of B. Gordon, W.A. Mills, and L.R. Welch (1962)-for example, high-shifted autocorrelation values and, in many cases, three-valued cross-correlation values with m -sequences. It is shown, moreover, that in many cases the linear complexities of cascaded GMW sequences are far greater than those of GMW sequences 相似文献
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DS-CDMA系统正交码调制的抗多址干扰性能及其改进 总被引:7,自引:0,他引:7
本文推导非同步 C D M A 系统多址干扰表达式,计算正交码调制码组相关性对多址干扰的影响。提出一种改进型 W alsh+ G M W 正交码组,分析比较 W alsh 正交码组和 W alsh+ G M W 正交码组应用于非同步 C D M A 系统的性能。计算机模拟结果表明应用改进型正交码组时系统性能获得改善。 相似文献
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Guang Gong Zong Duo Dai Golomb S.W. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2000,46(2):474-484
Gordon-Mills-Welch (GMW) sequences (also called cascaded GMW sequences) have two-level autocorrelations. This property makes them widely used in various communication and cryptographic systems. The generation of q-ary GMW sequences of period qn-1 involves three types of parameters. To determine whether GMW sequences are cyclically shift-distinct for differing parameters has remained an open question until now. In this paper, we completely solve this problem for varying all three types of parameters. We find a criterion for cyclically shift-distinct q-ary GMW sequences of period qn-1, and obtain the number of such sequences. For the special case of q=2, this solution facilitates counting the number of cyclic Hadamard difference sets which correspond to binary GMW sequences of period 2n-1 相似文献