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.

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.

scholarly journals Improved Chaotic Sequence Generation Method Based on Direct Spread Spectrum

2019 ◽  
Vol 1237 ◽  
pp. 042006
Author(s):  
Fang Liu ◽  
Shiyao Jia ◽  
Xiaodan Xu ◽  
Minghao Tian
Keyword(s):  
Spread Spectrum ◽  
Chaotic Sequence ◽  
Sequence Generation ◽  
Direct Spread

Quadrature MC-DCSK Scheme for Chaos-Based Cognitive Radio

2019 ◽  
Vol 29 (13) ◽  
pp. 1950177 ◽  
Author(s):  
Nguyen Xuan Quyen
Keyword(s):  
Cognitive Radio ◽  
Spread Spectrum ◽  
Original Data ◽  
Wireless Channel ◽  
Multicarrier Modulation ◽  
Quadrature Modulation ◽  
Bandwidth Efficiency ◽  
Spreading Sequence ◽  
Shift Keying ◽  
Chaos Shift Keying

In this study, we investigate an enhanced architecture of multicarrier differential chaos-shift keying (MC-DCSK) scheme using quadrature modulation (QM), namely QMC-DCSK. The use of quadrature modulation aims at doubling the data rate over a defined bandwidth and hence improve bandwidth efficiency of the system. In the proposed scheme, the chaotic spreading sequence is transmitted on a predefined frequency while each of the remaining frequencies is phase-shifted at a [Formula: see text] angle in order to produce two quadrature subcarriers located at the same frequency. These subcarriers are modulated by the product of the chaotic spreading sequence and the corresponding bit substreams in parallel. Noncoherent demodulation is carried out in the receiver in order to recover the original data based on the sign of correlation values. Architecture and operation of the conventional and proposed schemes are described. The BER performance over a wireless channel is theoretically derived and then numerically verified. The bit rate, energy and bandwidth efficiencies are evaluated in comparison with those of MC-DCSK. In particular, the application of the proposed scheme to cognitive radio (CR) in the scenario of using multicarrier modulation and chaotic spread-spectrum is discussed and evaluated. The obtained results prove that QMC-DCSK is a fit technique for CR communications.

scholarly journals Optimization of Spreading Code using Modified Differential Evolution for Wireless Communication

2021 ◽  
Author(s):  
Katyayani Kashyap ◽  
Sunil Pathak ◽  
Narender Yadav
Keyword(s):  
Wireless Communication ◽  
Bit Error Rate ◽  
Spread Spectrum ◽  
Logistic Map ◽  
Direct Sequence Spread Spectrum ◽  
Optimization Techniques ◽  
Spreading Code ◽  
Direct Sequence ◽  
Design Problems ◽  
Engineering Design Problems

Abstract Spread spectrum linked to optimization techniques play a very important role in today’s world. Optimization gives the best one among all the solutions and the spread spectrum is used to minimize distortion, hence optimized spreading code is very important in wireless communication. This study shows a comparison of two recent modified techniques of DE with the help of engineering design problems and application of that modified DE (considering the better one) in wireless communication to optimize logistic map based spreading code. A comparative study of properties of both optimized and non-optimized spreading code is also discussed in this paper. The performance of the optimized spreading code is also evaluated with the help of bit error rate (BER) by applying it in static and dynamic direct sequence spread spectrum system (DSSS). The performance of the proposed technique (optimized dynamic logistic map code based DSSS) displays better results than non-optimized spreading code and orthogonal spreading code considering BER. Therefore, the proposed method can be efficiently applied in the wireless communication system.

The Wireless Application of Space-Time Spread-Spectrum Technology in the Internet of Things

2011 ◽  
Vol 403-408 ◽  
pp. 2755-2759
Author(s):  
Han Cheng Liao
Keyword(s):  
Internet Of Things ◽  
Spread Spectrum ◽  
Spatial Diversity ◽  
Space Time ◽  
Wireless Channel ◽  
The Internet ◽  
Space Time Coding ◽  
Wireless Application ◽  
Code Division Multiple ◽  
The Internet Of Things

Massive data have to be quickly communicated in the internet of things with few error. Two good anti-fading technologies, spread spectrum and space-time coding technology are integrated to get better performance of combating fading in the wireless channel. Such kind of code division multiple access system is studied. A kind of well-chosen spread spectrum sequence is LAS code. The forward link system model, including both the transmitter and the receiver, is put forward. The decoding method, as well as some simulational performance results is given. With more than one antenna installed, it is able to achieve both the temporal diversity and the spatial diversity, which is conducive to enhance the system performance.

scholarly journals Study of the Performance of DSSS UAC System Depending on the System Bandwidth and the Spreading Sequence

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2484
Author(s):  
Iwona Kochanska ◽  
Roman Salamon ◽  
Jan H. Schmidt ◽  
Aleksander M. Schmidt
Keyword(s):  
Spread Spectrum ◽  
Transmission Rate ◽  
Multipath Propagation ◽  
Water Channel ◽  
Experimental Tests ◽  
Direct Sequence Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Underwater Acoustic ◽  
Spreading Sequence ◽  
Code Division Multiple

A signal transmitted in an Underwater Acoustic Communication (UAC) system operating in a shallow-water channel suffers from strong time dispersion due to multipath propagation. This causes the Inter-Symbol Interference (ISI) observed in the received signal, which significantly limits the communication system’s reliability and transmission rate. In such propagation conditions, the Direct-Sequence Spread Spectrum (DSSS) method is one of the solutions that make reliable data transmission possible. In systems with one-to-one communication, it ensures communication with a satisfactory Bit Error Rate (BER). Additionally, it makes it possible to implement the Code-Division Multiple Access (CDMA) protocol in underwater acoustic networks. This paper presents the results of simulation and experimental communication tests on a DSSS-based UAC system using three types of spreading sequence, namely m-sequences, Kasami codes and Gold codes, and occupying different bandwidths from 1 kHz to 8 kHz around a carrier frequency equal to 30 kHz. The UAC channel was simulated by impulse responses calculated by the virtual sources method and the UAC chanel models available in the Watermark simulator. The experimental tests were conducted in a model pool. Based on the obtained results, a transmission rate was estimated, which is possible to achieve in strong multipath propagation conditions, assuming reliability expressed as BER less than 0.001.

scholarly journals Statistical Analysis of Multiple Access Interference in Chaotic Spreading Sequence Based DS-CDMA Systems

2017 ◽  
Vol 21 (1) ◽  
pp. 34
Author(s):  
A. Litvinenko ◽  
E. Bekeris
Keyword(s):  
Statistical Analysis ◽  
Communication Systems ◽  
Multiple Access ◽  
Multiple Access Interference ◽  
Matlab Simulation ◽  
Spreading Sequence ◽  
Sequence Generation ◽  
Code Division Multiple ◽  
Correlation Properties ◽  
Spreading Sequences

This paper presents a statistical analysis of multiple access interference (MAI) in Direct Sequence Code Division Multiple Access (DS-CDMA) communication systems based on different types of chaotic spreading sequences. The probability distribution of the interference in a system with K users causing the MAI is studied using MATLAB simulation. For chaotic spreading sequence generation six different 1-D chaotic maps are used: modified Bernoulli, modified Tent, Gauss, Sine-Circle, Cubic and Pinchers map. A brief statistical analysis of the cross-correlation properties of the chaotic sequences generated by the aforementioned maps is also presented.

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.

Introduction to Wireless Endogenous Security and Safety: Problems, Attributes, Structures and Functions

2021 ◽  
Author(s):  
Xiaoyan Hu ◽  
Liang Jin ◽  
Yangming Lou ◽  
Zhou Zhong ◽  
Xiaoli Sun
Keyword(s):  
Wireless Communication ◽  
Communication System ◽  
Communication Systems ◽  
Wireless Channel ◽  
Communication Security ◽  
Wireless Communication Systems ◽  
Functional Safety ◽  
Wireless Communication System ◽  
Safety Technology ◽  
Safety Attributes

Abstract: The information security and functional safety of wireless communication systems have become the focus of current research. The endogenous security principle based on Dynamic Heterogeneous Redundancy provides a direction for the development of wireless communication security and safety technology. This paper introduces the concept of wireless endogenous security from the following four aspects. First, we sorts out the endogenous security problems faced by the current wireless communication system, and then analyzes the endogenous security and safety attributes of the wireless channel. After that, the endogenous security and safety structure of the wireless communication system is given, and finally the applications of the existing wireless communication endogenous security and safety functions are listed. <br>

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