共查询到20条相似文献,搜索用时 140 毫秒
1.
产生2元de Bruijn序列的一个新算法 总被引:3,自引:0,他引:3
2元n级deBruijn序列是由n级移位寄存器产生的周期为2n的移位寄存器序列,给出了2元deBruijn序列的一个新的生成算法,该算法能生成2s·g(n,s)个n级如de Bruijin序列,其中,0≤s≤2(n-7)/3;当 2l-1<s≤2L时,g(n,s)=n-3L-6-[(n-2L-6)/(L+1)]。 相似文献
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本文讨论了M序列的自相关性,并证明了:当0<|t-2^n-1|≤[n-1/2]时,|CM(t)|≤2^n-1。 相似文献
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关于本原M序列的一些自相关函数取值 总被引:7,自引:0,他引:7
本文讨论了由m序列叠加小项x2…xn构成的M序列的自相关性能,获得了c(n+1)=-4或0或4,c(τ1)=-4,c(τ2-1)=0或4(τ1和τ2意义见定理1)的新结果,同时并给出了c(n+k)(k≥2)的可能取值范围。 相似文献
4.
线性拟等重码的结构分析 总被引:3,自引:0,他引:3
C为二元正侧线性拟等重码,我们证明:(1)如果n=2d则C等价于1阶;(2)如何为素数,则C等价于RM(k-1)删除第1个分量后得到的线性码,另外,利用编码理论中著名的Mac William恒等式给出文(1)定量1的一个新的简洁证明。 相似文献
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RuO_2-Ag低阻浆料中掺入MnO_2、V_2O_5杂质改善电阻特性宋兴义(昆明贵金属研究所昆明650221)为了改善RuO2-Ag系低阻浆料的电阻温度系数,大多采用在电阻浆料中掺入表1掺MnO2的RuO2-Ag电阻浆料配方MnO2、V2O5、Nb2O... 相似文献
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新型厚膜片式NTC热敏元件研究 总被引:1,自引:1,他引:0
作者以Mn(1+x)Co(2-x)O4作热敏基料,掺适量MeMn2O4添加物,有效地降低了热敏浆料的方组,改善了元件的热稳定性,使厚膜片式NTC热敏元件达到了实用化的要求。 相似文献
8.
报道了Ca掺杂量对La-Ca-Mn-O巨磁薄膜材料的巨磁效应影响,测量薄膜电阻(外磁场强度H=0.5T)磁化强度,温度关系曲线,认为La1-xCaxMnO3体系中Mn^4+的含量是由于掺杂量Ca的调制Mn^4+的含量变化导致磁性结构转变,用双交换模型解释了该象现,对实验给出满意的解释。 相似文献
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研究了不同热压压力、热压方式对Co-Mn-Ni-O热敏材料电性能的影响。热压烧结能够提高材料的电阻率及B值。X射线衍射分析表明,热压烧结材料有MnCo2O4、NiMn2O4和CoNiO2三相组成。从扫描电镜照片可见,热压烧结材料晶粒细小、均匀、气孔率少,是提高其电性能的主要原因。调整热压压力可以有效地控制材料的电学参数 相似文献
11.
《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1967,55(7):1211-1213
A method of generating ternary sequences with zero cyclic correlation except for the spike for zero lag is described. The sequences are of length given by (3n-1)/2 where n is odd. A method of generating uncorrelated sequences derived from the ternary sequence modified by a Hadamard matrix is indicated. 相似文献
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本文给出了生成k元M序列的一种新的算法.该算法不再采用主圈并一个圈的经典并圈法,而是利用了主圈并一组共轭圈的新的并圈方法.这样减少了选择桥状态的次数,进而加快了并圈速度. 相似文献
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朱士信 《电子科学学刊(英文版)》1994,(1)
A new algorithm for generating k-ary M sequences is given. In the algorithm a new method is used that the main cycle is extended by joining to it a subset of cycles instead of the classical one in which the main cycle is extended by joining to it one cycle. The algorithm reduces the times of choosing bridging states and accelerates the speed of joining cycles. 相似文献
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广义映射混沌扩频序列及其特性分析 总被引:9,自引:0,他引:9
该文从扩频通信对扩频码序列的要求出发,提出采用广义映射产生混沌数字序列的思路。通过对广义映射混沌数字序列相关性和平衡性的分析,给出一种改进的广义映射混沌数字序列生成方法。计算机模拟分析表明,使用该文方法生成的混沌序列具有良好的平衡性和保密性,更适合在码分多址通信中应用。 相似文献
16.
Zero correlation window (ZCW) or zero correlation zone (ZCZ) sequence can be used in quasi-synchronous code division multiple access (QS-CDMA) system to eliminate multiple access and multipath interferences. However, as the length of ZCW or ZCZ increases, fewer sequences are available. Recently, a new concept, sequence set with group-wise zero correlation window is introduced, which can increase the number of available sequences for a QS-CDMA system. In this article, a new method for generating sequence set with group-wise zero correlation window is presented. This method is based on a Hadamard matrix of size N×N and a pair of Hadamard matrices of size M×M. Compared with previous methods, the proposed sequence set has a group-wise zero correlation window for both periodic and aperiodic cross-correlation functions. 相似文献
17.
《IEEE instrumentation & measurement magazine》2009,12(1):34-38
We have presented two methods for generating i.i.d. standard Gaussian random variates, given a function that generates i.i.d. uniform random variates. Given modern computer hardware and software libraries, the Box-Muller transform is likely to be slightly more efficient than the inverse-transform method. Both are very simple to program, provided, in the latter case, that one already has available one of the high-accuracy approximations to Fx -1. The inverse-transform method also has appeal in particular specialized applications of Monte Carlo simulation. We have also briefly presented methods for generating i.i.d. sequences of bivariate Gaussian random vectors with correlation p, as well as general multivariate Gaussian random vectors. 相似文献
18.
A family of binary sequences exists with the property that the cross-correlation function of each member with a reference m-sequence has a unique pattern of four peaks with equal offsets from a constant base level. The positive peak is position invariant and knowledge of the locations of the remaining three peaks, which are negative, identifies the sequence. A simple method for generating the sequences is given and an application in the form of a system for data transmission by code modulation of an m-sequence carrier is proposed. 相似文献
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Presents a generating function for runlength limited sequences intended for binary asymmetrical channels. The channel capacity for such channels is derived from this generating function. The authors furthermore present selected numerical values of channel capacity for these sequences. An expression for the power spectrum of binary maxentropic asymmetrical sequences is given and the influence of the asymmetry on the spectrum is investigated, Two new runlength limited modulation codes which are suitable for use on binary asymmetrical channels are investigated 相似文献
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Suehiro N. Hatori M. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》1988,34(1):143-146