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首页> 外文会议>International Conference on Cybernetics and Information Technologies, Systems and Applications(CITSA2004) and 10th International Conference on Information Systems Analysis and Synthesis(ISAS2004) vol.3 >Complex-Valued Chaotic Spreading Sequence for Quadrature Modulation Based I-Q DS/SS System
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Complex-Valued Chaotic Spreading Sequence for Quadrature Modulation Based I-Q DS/SS System

机译：基于正交调制的I-Q DS / SS系统的复值混沌扩展序列

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摘要

In this paper, the complex-valued chaotic Ikeda Map (IM) is exploited as a 2-D spreading sequence for the design of quadrature modulation based Inphase-Quadrature direct sequence spread spectrum (I-Q DS/SS) communication system. The availability of a complex structure (i.e., real and imaginary components) in IM chaotic sequences with good correlation characteristics has motivated this work for its ready use in quadrature modulation system. The spreading sequences from the chaotic map are obtained by optimally selecting them from a large set of sequences, which are generated from repeated use of the IM. The BER performance of the proposed IM based I-Q DS/SS system is evaluated in multi-user environment under Additive White Gaussian Noise (AWGN) and Rayleigh flat fading channel conditions. Simulation studies revealed that the proposed scheme works quite similar to the conventional Gold code DS/SS system for the same sequence lengths. The superiority of the proposed scheme is in terms of its security, availability of unlimited number of spreading sequences with larger spreading gain, and ease in sequence generation.
机译：在本文中，将复值混沌池田映射（IM）作为二维扩展序列，用于基于正交调制的同相-正交直接序列扩展频谱（I-Q DS / SS）通信系统的设计。具有良好的相关特性的IM混沌序列中复杂结构（即，实部和虚部）的可用性促使该工作准备好在正交调制系统中使用。通过从一大组序列中最佳选择它们，可以从混沌图谱中获得扩展序列，这些序列是通过重复使用IM生成的。在多用户环境中，在加性高斯白噪声（AWGN）和瑞利平坦衰落信道条件下，评估了基于IM的I-Q DS / SS系统的BER性能。仿真研究表明，对于相同的序列长度，该方案的工作原理与传统的Gold code DS / SS系统非常相似。所提出的方案的优越性在于它的安全性，无限数量的扩频序列的可用性和更大的扩频增益，以及易于产生序列。

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