7 research outputs found

    Chaos-Based Communication Systems

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    The attractive properties of chaos signal that is generated from dynamic systems motivate the researchers to explore the advantage of using this signal type as a carrier in different communication systems. In this chapter, different types of digital chaos–based communication system are discussed; in particular, digital communications where reference signal and its modulated version are transmitted together. This type is called differential coherent systems. Brief surveys on the recently developed systems are presented

    A chaotic jerk system with different types of equilibria and its application in communication system

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    In this paper, a new jerk system is designed. This system can display different characters of equilibrium points according to the value of its parameters. The proposed nonlinear oscillator can have both self-excited and hidden attractors. Dynamical properties of this system are investigated with the help of eigenvalues of equilibria, Lyapunov exponents' spectrum, and bifurcation diagrams. Also, an electronic circuit implementation is carried out to show the feasibility of this system. As an engineering application of this new chaotic jerk system, a chaotic communication system is realized by correlation delay shift keying. When the results of the communication system are examined, the transmitted information signal is successfully obtained in the receiving unit, and its performance efficiency is investigated in the presence of additive white Gaussian noise

    Performance of a SIMO-CDSK System over Rayleigh Fading Channels

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    This paper proposes a single-input multiple-output (SIMO) architecture for correlation delay shift keying (CDSK) modulation technique, and the bit error rate (BER) formula is derived under the assumption of the proposed system over Rayleigh fading channels. The new system employs multiple antennas at the receiver end to form a SIMO structure so as to obtain a diversity gain. Theoretical analysis and simulations show that, at a higher signal-to-noise ratio (SNR), the proposed SIMO-CDSK architecture has an outstanding bit error rate (BER) performance in contrast to the conventional single-input single-output (SISO) CDSK and GCDSK communication system; for the given SNR, the diversity gain of the proposed system will be improved with the number of receiver antennas increasing; for different SNRs, the best performance of the proposed system can be obtained by selecting the reasonable spreading factor; because the performance of SIMO-CDSK system is independent of the time delay, the proposed system has better security than GCDSK system

    Novel wireless modulation technique based on noise

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    In this paper, a new RF modulation technique is presented. Instead of using sinusoidal carriers as information bearer, pure noise is applied. This allows very simple radio architectures to be used. Spread-spectrum based technology is applied to modulate the noise bearer. Since the transmission bandwidth of the noise bearer can be made very wide, up to ultra-wideband regions, extremely large processing gains can be obtained. This will provide robustness in interference-prone environments. To avoid the local regeneration of the noise reference at the receiver, the Transmit-Reference (TR) concept is applied. In this concept, both the reference noise signal and the modulated noise signal are transmitted, together forming\ud the bearer. The reference and modulated signals are separated by applying a time offset. By applying different delay times for different channels (users) a new multiple access scheme results based on delay: Delay Division Multiple Access (DDMA). A theoretical analysis is given for the link performance of a single-user and a multi-user system. A testbed has been built to demonstrate the concept. The demonstrator operates in a 50 MHz bandwidth centered at 2.4 GHz. Processing gains ranging from 10Âż30 dB have been tested. The testbed confirms the basic behavior as predicted by the theory

    Novel Adaptive Decision Threshold Modulation Technique for UWB Direct Chaotic Communications

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    A new non-coherent chaotic modulation technique based on adaptive decision threshold is proposed for the UltraWideBand (UWB) Direct Chaotic Communication (DCC) technology. The principal advantages of the proposed technique are: (1) Removing the threshold problem of the classical Chaotic On-Off Keying modulation technique which uses a nonzero decision threshold; (2) Providing a high throughput comparing to the others techniques since it do not uses any delay at the modulation; (3) Reducing the transmitted power, thanks to a transmitted bit energy devised by two. The obtained simulation results show high Bit Error Rate performances of the proposed technique applied in an UWB DCC system. In addition, the new chaotic modulation is more suitable in all DCC-based communications schemes

    Joint signal detection and channel estimation in rank-deficient MIMO systems

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    L'Ă©volution de la prospĂšre famille des standards 802.11 a encouragĂ© le dĂ©veloppement des technologies appliquĂ©es aux rĂ©seaux locaux sans fil (WLANs). Pour faire face Ă  la toujours croissante nĂ©cessitĂ© de rendre possible les communications Ă  trĂšs haut dĂ©bit, les systĂšmes Ă  antennes multiples (MIMO) sont une solution viable. Ils ont l'avantage d'accroĂźtre le dĂ©bit de transmission sans avoir recours Ă  plus de puissance ou de largeur de bande. Cependant, l'industrie hĂ©site encore Ă  augmenter le nombre d'antennes des portables et des accĂ©soires sans fil. De plus, Ă  l'intĂ©rieur des bĂątiments, la dĂ©ficience de rang de la matrice de canal peut se produire dĂ» Ă  la nature de la dispersion des parcours de propagation, ce phĂ©nomĂšne est aussi occasionnĂ© Ă  l'extĂ©rieur par de longues distances de transmission. Ce projet est motivĂ© par les raisons dĂ©crites antĂ©rieurement, il se veut un Ă©tude sur la viabilitĂ© des transcepteurs sans fil Ă  large bande capables de rĂ©gulariser la dĂ©ficience de rang du canal sans fil. On vise le dĂ©veloppement des techniques capables de sĂ©parer M signaux co-canal, mĂȘme avec une seule antenne et Ă  faire une estimation prĂ©cise du canal. Les solutions dĂ©crites dans ce document cherchent Ă  surmonter les difficultĂ©s posĂ©es par le medium aux transcepteurs sans fil Ă  large bande. Le rĂ©sultat de cette Ă©tude est un algorithme transcepteur appropriĂ© aux systĂšmes MIMO Ă  rang dĂ©ficient
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