Dynamic Logistic Map Based Spread Spectrum Modulation in Wireless Channels

2018 ◽  
Vol 9 (2) ◽  
pp. 52-65
Author(s):  
Katyayani Kashyap ◽  
Tarun Kumar Sharma
Keyword(s):  
Spread Spectrum ◽  
Wireless Channels ◽  
Logistic Map ◽  
Chaotic Sequence ◽  
Direct Sequence Spread Spectrum ◽  
Computational Time ◽  
Sequence Length ◽  
Spreading Sequence ◽  
Nonlinear Channels ◽  
Spread Spectrum Modulation

Generation of an efficient spreading code in Spread Spectrum Modulation (SSM) is always challenging due to considerations like optimum sequence length, physical layout of registers and power requirements. In this article, a design of a dynamic chaotic spreading sequence for application in a Direct Sequence Spread Spectrum (DS SS) based system with the considerations of wireless channels (Rayleigh and Rician) are presented. Generation of dynamic chaotic sequence for application in linear and nonlinear channels is done and a comparison with static chaotic sequence is presented. Evaluation of performance is done in terms of bit error rate (BER), computational time, mutual information and signal power for faded channel taking into considerations of different modulation schemes, which finally dictates the efficiency of the generated code. The performance of the generated dynamic logistic map-based sequence is compared to that obtained from Gold code under equivalent conditions.

Design of Logistic Map-Based Spreading Sequence Generation for Use in Wireless Communication

2015 ◽  
pp. 81-121 ◽  
Author(s):  
Katyayani Kashayp ◽  
Kandarpa Kumar Sarma ◽  
Manash Pratim Sarma
Keyword(s):  
Wireless Communication ◽  
Spread Spectrum ◽  
Logistic Map ◽  
Chaotic Sequence ◽  
Wireless Channel ◽  
Computational Time ◽  
Spreading Sequence ◽  
Sequence Generation ◽  
Critical Issues ◽  
Code Division Multiple

Spread spectrum modulation (SSM) finds important place in wireless communication primarily due to its application in Code Division Multiple Access (CDMA) and its effectiveness in channels fill with noise like signals. One of the critical issues in such modulation is the generation of spreading sequence. This chapter presents a design of chaotic spreading sequence for application in a Direct Sequence Spread Spectrum (DS SS) system configured for a faded wireless channel. Enhancing the security of data transmission is a prime issue which can better be addressed with a chaotic sequence. Generation and application of chaotic sequence is done and a comparison with Gold sequence is presented which clearly indicates achieving better performance with simplicity of design. Again a multiplierless logistic map sequence is generated for lower power requirements than the existing one. The primary blocks of the system are implemented using Verilog and the performances noted. Experimental results show that the proposed system is an efficient sequence generator suitable for wideband systems demonstrating lower BER levels, computational time and power requirements compared to traditional LFSR based approaches.

Performance Analysis of Chaotic Spread Spectrum Sequences

2014 ◽  
Vol 852 ◽  
pp. 608-612 ◽  
Author(s):  
Chun Guang Liao ◽  
Ping Liu
Keyword(s):  
Spread Spectrum ◽  
Logistic Map ◽  
Direct Sequence Spread Spectrum ◽  
Binary Sequences ◽  
Direct Sequence ◽  
Tent Map ◽  
Spreading Sequence ◽  
Chaotic Sequences ◽  
Chebyshev Map ◽  
Spread Spectrum Systems

The properties of chaotic maps based on Logistic map, Tent map, Improved Logistic map and Chebyshev map are analyzed in this paper .Then we discuss the performance of correlation, balance and run-length of the chaotic binary sequences . Simulation results show that the characteristics of chaotic sequences are similar to the traditional pseudo-random sequences, and chaotic sequence is suitable for direct sequence spread spectrum systems as spreading sequence.

A Novel Anti-Jamming Driven Sparse Analysis-Based Spread Spectrum Communication Methodology

2018 ◽  
Vol 33 (01) ◽  
pp. 1958001 ◽  
Author(s):  
Wenzhun Huang ◽  
Zhe Liu ◽  
Lintao Lv ◽  
Liping Wang ◽  
Shanwen Zhang
Keyword(s):  
Spread Spectrum ◽  
Direct Sequence Spread Spectrum ◽  
Research Topic ◽  
Spread Spectrum Communication ◽  
Experimental Result ◽  
Direct Sequence ◽  
Analysis Framework ◽  
Communication Analysis ◽  
Spread Spectrum Modulation ◽  
Sparse Presentation

With the rapid and bursting development of communication engineering and some related techniques, spread spectrum communication and sparse analysis have been a hot research topic in the research community. A novel anti-jamming driven sparse analysis-based spread spectrum communication methodology is proposed in this paper, which mainly increases the spread spectrum modulation and the spread spectrum demodulation in the receiving end. The process of spread spectrum communication according to the working methods of different methodologies including direct-sequence spread spectrum. In this paper, the sparse presentation, dictionary learning, anti-jamming analysis and the basic communication theories are integrated altogether to enhance the traditional spread spectrum communication analysis framework. The experimental result proves the robustness of the proposed method.

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