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Multitopic Conference, 2006. INMIC '06. IEEE

Date 23-24 Dec. 2006

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    Publication Year: 2006 , Page(s): nil1 - nil2
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    Publication Year: 2006 , Page(s): C1
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    Publication Year: 2006 , Page(s): C3
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    Publication Year: 2006 , Page(s): nil5
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  • Preface

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  • Heuristics Assisted Detection in High Speed Wireless Communication Systems

    Publication Year: 2006 , Page(s): 1 - 5
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4969 KB) |  | HTML iconHTML  

    Swarm intelligence assisted multi-input-multi-output (MIMO) system is presented in this paper. Efficient symbol detection of MIMO system is performed using swarm-intelligence inspired iterative robust stochastic algorithm. Optimized detection based on "memetic" (local search) particle swarm optimization (MPSO) is also proposed. These PSO-MIMO and MPSO-MIMO system detectors significantly reduce the computational complexity as compared to the conventional maximum likelihood (ML) detection technique. The simulation results achieved with these detectors show near ML performance. These new heuristic based symbol detection techniques are efficient for systems using high-order modulation schemes and large number of antennas where conventional ML detector becomes computationally non-practical to use. These proposed detectors are best suited for high- speed wireless communication systems View full abstract»

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  • A Non-Uniform DMT Transceiver for the Power-Line Channel in the High Frequency Range

    Publication Year: 2006 , Page(s): 6 - 10
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5224 KB) |  | HTML iconHTML  

    A reliable and high speed communication system over the low voltage distribution power-lines, necessitates a robust modulation technique, such as discrete multitone (DMT). Power-lines represent a harsh, noisy and multipath channel, resulting in severe signal attenuation and inter-symbol interference (ISI). DMT being a multi-carrier modulation technique involves much simpler zero-forcing channel equalization, with the drawback that it enhances additive channel noise. A non-uniform DMT transceiver having dyadic wavelet filter bank can be used to reduce the channel-noise amplification problem. In this paper the bit error rate (BER) performance of the non-uniform DMT transceiver is analyzed in two power-line reference channels, and compared with the performance of a conventional DMT system. It is shown that the non-uniform DMT transceiver gives some improvement in BER over the conventional DMT system in identical channel and noise conditions View full abstract»

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  • Investigation and Performance Evaluation of different Bluetooth voice packets against ambient error conditions

    Publication Year: 2006 , Page(s): 11 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6380 KB) |  | HTML iconHTML  

    Bluetooth allows three high quality voice (HV) packets to carry voice information over the Industrial, Scientific and Medical (ISM) band. The bit error rate (BER) measurements have been used in this report to evaluate the performance of voice packets in the presence of noise and interference. Starting from the problem definition and classifying the voice packets into HV1, HV2 and HV3 type, Bluetooth system has been unpacked. The paper also discuses Bluetooth related wireless standards operating in the same ISM band such as IEEE 802.11 b, whose presence in the close proximity causes interference to Bluetooth operation. Finally a Matlab based simulink model has been used to analyze the BER. The maximum tolerable BER of 5times10-2 is required to recover a perceptible quality of voice information. With respect to BER the HV2 type outperforms HV1 and HV3 due to the low SNR requirement for the same BER View full abstract»

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  • SIC Detector for Hi Orthogonal Space-Time Block Coded System over Time-Varying Rayleigh-Fading Channel

    Publication Year: 2006 , Page(s): 17 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4225 KB) |  | HTML iconHTML  

    An important assumption in all orthogonal space-time block coded (OSTBC) systems is that the channel behaves same throughout the codeword length (i.e. quasi-static). However, if the channel is time-varying then the conventional OSTBC detector can suffer from a large error floor at high signal-to-noise ratios. In this paper, the impact of a time-varying, Rayleigh fading channel on the performance of an Hi system is considered. A successive interference cancellation (SIC) technique is proposed to alleviate the effects of a time-varying channel. Performance comparison between the existing conventional, parallel interference cancellation (PIC) detector and the proposed SIC detector shows that the SIC detector performs better than the conventional detector and worse than the PIC detector if equal-energy symbols are employed. However, it outperforms both the detectors if unequal energy symbols are used. View full abstract»

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  • The Design, Performance and Comparison of Four Different Ku-Band Common-Source DROs

    Publication Year: 2006 , Page(s): 22 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5536 KB) |  | HTML iconHTML  

    This paper describes the design and performance of four Ku-band common-source dielectric resonator oscillators (DROs). The first uses open-circuited stubs at the source to create instability, while the second employs an additional dielectric resonator (DR) for the same purpose. The third has the source connected to a 50Omega impedance and the fourth has the source grounded. A comparison is made between the general characteristics of the four configurations. View full abstract»

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  • Peak-To-Average Power Ratio Reduction by Zero Forcing Peaks

    Publication Year: 2006 , Page(s): 28 - 31
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3468 KB) |  | HTML iconHTML  

    One of main drawback of orthogonal frequency division multiplexing (OFDM) is high peak to average power ratio (PAPR) which causes non-linearity at power amplifier stage. In this paper a new technique for reducing PAPR of the OFDM signal is implemented. This method does not spread the OFDM signal bandwidth and no additional IFFT has to be performed thus has less computational complexity. View full abstract»

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  • A Random Key Distribution Scheme for Securing Wireless Sensor Network

    Publication Year: 2006 , Page(s): 32 - 36
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5826 KB) |  | HTML iconHTML  

    Sensor networks are expected to play an essential role in the upcoming age of pervasive computing. Due to their constraints in computation, memory, and power resources, their susceptibility to physical capture, and use of wireless communications, security is a challenge in these networks. The scale of deployment of wireless sensor networks requires careful decisions and trade-offs among various security measures. In this paper we present a key management scheme based on the basic random key predistribution scheme. Our analysis of this scheme shows that it is resilient to node capture and provide features such as dynamic security, low-complexity, node to node authentication, global and continuous authentication of every node in thee network and multiple level of encryption. View full abstract»

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  • Multicode Multicarrier Interleave Division Multiple Access Communication

    Publication Year: 2006 , Page(s): 37 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3808 KB) |  | HTML iconHTML  

    A new mulitcode multicarrier interleave division multiple access (MC-MC-IDMA) system is proposed and analyzed in frequency selective channels. The system supports different modulation schemes for variables data rates. Each user transmits his message by choosing a sequence from an orthogonal code-set. An MC-MC-IDMA system achieves spreading gains both in time and frequency domains. Bit error rate of the system is derived and simulation results are presented. View full abstract»

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  • Efficient Power Variance Algorithms for PAPR Reduction in OFDM Signals

    Publication Year: 2006 , Page(s): 42 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4065 KB) |  | HTML iconHTML  

    In this paper, the expression of the power variance (PV) of an OFDM symbol has been explored for peak to average power ratio (PAPR) reduction. It is seen through simulation results and complementary cumulative distribution function (CCDF) curves that PV expression used in PAPR comparison can be simplified to a point where it becomes practical to use such a computationally complex PV expression for PAPR comparison. View full abstract»

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  • Sensitivity Analysis of Hybrid DS / FH Spread Spectrum Communication System Capacity

    Publication Year: 2006 , Page(s): 47 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4166 KB) |  | HTML iconHTML  

    Sensitivity of noncoherent synchronous hybrid direct sequence (DS)/frequency hopping (FH) multiple access communication system capacity is analyzed. System operates through the channel with additive white Gaussian noise (AWGN) and employs differential phase shift keying modulation (DPSK) with random DS code sequence and frequency hopping pattern. System capacity, defined as total number of possible simultaneous users in the system, is found to be function of DS code length, number of hopping frequencies, signal to noise ratio and acceptable bit error rate. Sensitivity of the system capacity to changes in these system variables is investigated. System capacity is found to be most sensitive to DS code length while signal to noise ratio and number of hopping frequencies affect the system capacity to lesser degrees View full abstract»

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  • Performance of Hybrid MQAM-LFSK (HQFM) OFDM Transceiver in Rayleigh Fading Channels

    Publication Year: 2006 , Page(s): 52 - 55
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4450 KB) |  | HTML iconHTML  

    In this contribution we propose a hybrid MQAM/LFSK modulation (HQFM) scheme and showed its performance over Rayleigh fading channels using different modulation formats and Doppler spread. The simulation invokes a PN sequence training based decision feedback equalizer. The performance of the proposed scheme was compared with conventional 256QAM-OFDM when communicating over channels exhibiting multi-path components. It was shown that the scheme advocated outperforms conventional system. View full abstract»

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  • An Analytical Model for SLTDM to Reduce the PAPR and ICI in OFDM Systems for Fast Varying Channels

    Publication Year: 2006 , Page(s): 56 - 61
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5693 KB) |  | HTML iconHTML  

    OFDM (orthogonal frequency division multiplexing) technique is a promising candidate for the most of current and future modern wireless communication systems. It however suffers from two major drawbacks, namely the high PAPR and ICI. The later is present only in time varying channels. To combat with these problems various researchers of the current era have proposed numerous techniques. However most of the known techniques fail considerably when the channel characteristics change considerably within symbol duration. An analytical model for an alternative technique is proposed in this paper. This model maintains the major advantages of OFDM and gives better solutions to both PAPR and ICI problems. It keeps all the global OFDM structure but unlike OFDM this model uses TDM technique instead of FDM, which is used in OFDM. This suggests considering it a symbol-level TDM (SLTDM) technique. In this paper we have proposed the SLTDM analytical model, which follows the similar steps as we have in OFDM analytic model. Simulation results confirmed the SLTDM supremacy over OFDM in time varying channels View full abstract»

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  • Development and Analysis of a Data Transmission System for Oil Exploration Sites

    Publication Year: 2006 , Page(s): 62 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5170 KB) |  | HTML iconHTML  

    In recent years satellite mobile communications systems and market have entered into the era of maturation. Systems like Iridium and Global Star are technically considered as state of the art. This research paper is the result of a feasibility study of utilizing the low earth orbit, Iridium satellite network for the data transfer. The findings of this research, also demonstrate the performance and reliability of the satellite link. A system of data transfer is developed according to a set of specifications, along with the selection of a suitable satellite link. This data collection system is realized in such a way, that there is software which interfaces the PC of the data transmitting station, with the Iridium satellite constellation; a similar system configuration is present at the data receiving station View full abstract»

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  • Signal Modeling Using Transmultiplexer Structures

    Publication Year: 2006 , Page(s): 68 - 73
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4666 KB) |  | HTML iconHTML  

    This article presents signal modeling techniques by using different transmultiplexer structures. By this methodology any arbitrary signal x(n) isinl2 can be reconstructed as an output of an FIR filter C(z) of an order L. This filter is excited by a signal y(n)= Sigma i=0 M-1 Sigmak=-infin Si(k) fi (n_kM) isinl2, which can be considered as an output of the left hand side of the transmultiplexer structure. Where, fi(n) is the impulse response of the filter Fi(z) which is oversampled by M>L. The inputs to the filters Fi(z) are si(n) and their approximation can be obtained as: Scirc(n)= Sigmak=-infin infin x(k)hi (Mn - k) isinl2 , i=0,..., M - 1, where hi(n) is the impulse response of the filter Hi (z) which is decimated by M. The signals scirci(n), i = 0,...,M -1 can be considered as an output of the right hand side of the transmultiplexer structure. By this proposed methodology, the signal modeling is equivalent to finding the set of filters Hi(z) and Fi(z) for a given signal x(n) isinl2 and for a given FIR filter C(z) such that si(n) ap scirci(n), i= 0,...,M -1. View full abstract»

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  • Criteria for the Detection of Weak Signals through a Nonlinear Bi-stable System

    Publication Year: 2006 , Page(s): 74 - 78
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4620 KB) |  | HTML iconHTML  

    The dynamics of a nonlinear bistable system are analyzed in the presence of noise for detecting the weak signals. It is shown that suitable selection of such system parameters with optimal noise intensity values increases the spectral amplification of weak input signal. A criteria has been developed for evaluating the system's performance under various input conditions thus providing the system parameters and noise intensities for maximal performance. Necessary conditions for weak signal amplification are derived, leading to its efficient detection using this simple bistable system. The special case of threshold detection is also discussed using the same results View full abstract»

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