共查询到19条相似文献,搜索用时 46 毫秒
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一类具有最优平均汉明相关特性的跳频序列族 总被引:1,自引:0,他引:1
平均汉明相关是评价跳频序列性能的重要判据之一。该文基于模p的高次剩余构造了一类长度为p2,序列族的大小为(p-1)2的跳频序列族。该跳频序列族的平均汉明自相关值为0,平均汉明互相关值为1,关于平均汉明相关理论界是最优的。 相似文献
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扩频通信中伪随机序列的捕获 总被引:2,自引:0,他引:2
1伪随机序列捕获的方法伪随机序列捕获的方法可分为串行搜索法和并行判决法两种。1.1串行搜索法串行搜索捕获是在本地伪随机序列和接收伪随机序列不同步的情况下,调整本地序列相位,逐一进行试验,直到发现某本地序列相位和接收序列相位基本一致为止,如图1所示。假设扩频系数为M,每码片两个采样时,需要进行2M次试验,则每次试验费时为伪随机序列一个周期的时间,即一个符号的时间。也就是说,在其它参量已同步且检测到无错误时,最多需要2M个符号后,才能对伪随机序列实现捕获。串行搜索捕获是以输入数据中伪随机序列相位为参考,… 相似文献
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p-ary unified sequences: p-ary extended d-form sequences with the ideal autocorrelation property 总被引:7,自引:0,他引:7
Jong-Seon No 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2002,48(9):2540-2546
In this paper, for a prime number p, a construction method to generate p-ary d-form sequences with the ideal autocorrelation property is proposed and using the ternary sequences found by Helleseth, Kumar, and Martinsen (2000), ternary d-form sequences with the ideal autocorrelation property are constructed. By combining the methods for generating p-ary extended sequences (a special case of geometric sequences) and p-ary d-form sequences, a construction method of p-ary unified (extended d-form) sequences which also have the ideal autocorrelation property is proposed. This is a very general class of p-ary sequences including the binary and nonbinary extended sequences and the d-form sequences. From the ternary sequences by Helleseth, Kumar, and Martinsen, ternary unified sequences with the ideal autocorrelation property are also generated. 相似文献
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New nonbinary sequences with ideal two-level autocorrelation 总被引:8,自引:0,他引:8
Helleseth T. Guang Gong 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2002,48(11):2868-2872
We find new families of nonbinary sequences of period pn-1 with symbols from a finite field Fp for any prime p⩾3. The sequences have two-level ideal autocorrelation and are generalizations of previously found ternary sequences with ideal autocorrelation. Difference sets with parameters ((pn-1)/(p-1), (pn-1-1)/(p-1), (pn-2-1)/(p-1)) can also be derived from these sequences in a natural way 相似文献
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对偶频带法在构造宽间隔跳频序列时存在频点间距范围的限制和遗漏满足宽间隔的频率对的问题。针对这两个问题,为了进一步提高对偶频带法的抗干扰性能,提出了一种改进的对偶频带法的宽间隔处理方法。利用Matlab软件对算法进行了实例仿真,计算并对比了两种方法实例的汉明相关值。实验结果表明,改进对偶频带法简化了宽间隔跳频序列生成结构,汉明相关性能优于对偶频带法。 相似文献
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《IEEE transactions on information theory / Professional Technical Group on Information Theory》1964,10(2):119-126
A necessary and sufficient condition is derived for a function to be the autocorrelation function of a time-limited function of specified length. A constructive procedure for determining all possible time-limited functions having the same autocorrelation function as a given time4imited function is presented. The procedure consists of passing the given time function through one out of a collection of specially tailored all-pass filters. The class of functions so generated may be either finite or infinite depending on the original time function. Specific examples of the construction procedure are given. 相似文献
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伪随机序列在流密码、信道编码和扩频通信等领域有着广泛的应用,m序列是重要的伪随机序列.文中首先对m序列的原理、结构及性质进行分析,然后通过matlab仿真实现m序列,并对其相关特性进行仿真,结果表明该方法的正确性和可行性. 相似文献