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2005 IEEE 7th CAS Symposium on Emerging Technologies: Circuits and Systems for 4G Mobile Wireless Communications

23-24 June 2005

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Displaying Results 1 - 25 of 29
  • ETW '05. The 7th IEEE Emerging Technologies Workshop: Circuits and Systems For 4G Mobile Wireless Communications (IEEE Cat. No.05EX1013)

    Publication Year: 2005
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  • Copyright page

    Publication Year: 2005, Page(s): 2
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  • Staff/Society listings

    Publication Year: 2005, Page(s): 4
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  • Program message

    Publication Year: 2005, Page(s): 5
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  • Table of contents

    Publication Year: 2005, Page(s):6 - 7
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  • Signal processing and wireless networks

    Publication Year: 2005
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (69 KB)

    Summary form only given. A major issue in today's wireless world is the dramatic increase in demand for new capacity and higher performance of wireless networks. The development of these capabilities is limited severely by the scarcity of two of the principal resources in wireless networks, namely energy and bandwidth. Consequently, the community has turned to a third principal resource, the addit... View full abstract»

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  • Adaptive input-power processing for mitigation of PAPR in OFDM

    Publication Year: 2005, Page(s):9 - 12
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (224 KB) | HTML iconHTML

    The high peak-to-average-power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) greatly limits the high power amplifier (HPA) power efficiency. Different from other approaches to PAPR mitigation, the approach in this paper presents a simple new scheme which employs adaptive input power processing to reduce the instantaneous power fluctuation of OFDM signals. Specifically, at the t... View full abstract»

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  • Reconfigurable front-end architectures and A/D converters for flexible wireless transceivers for 4G radios

    Publication Year: 2005, Page(s):13 - 18
    Cited by:  Papers (15)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (304 KB) | HTML iconHTML

    Flexibility is a key feature in 4G telecom systems, where there is a demand for reconfigurable transceivers that can cope with multiple standards (cellular, WLAN, Bluetooth, etc.). Additionally, these transceivers should adapt to the environment (presence of received blockers or not, status of battery power levels, etc.) to minimize power consumption and optimize performance according to the needs... View full abstract»

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  • Wireless sensor networks: a new communication paradigm

    Publication Year: 2005
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. Computers, communication, and sensing technologies are converging to change the way we live, interact, and conduct business. Wireless sensor networks reflect such convergence. These networks are based on collaborative efforts of a large number of sensor nodes. They should be low-cost, low-power, and multifunction. These nodes have the capabilities of sensing, data processi... View full abstract»

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  • The algorithm to optimize allocation and utilization of frequency spectrum for wireless access systems

    Publication Year: 2005, Page(s):20 - 23
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (160 KB) | HTML iconHTML

    This paper presents the algorithm to optimize allocation and utilization of frequency spectrum for wireless access systems. It provides a systematic approach that includes geographical factors, market and traffic impacts, technical and systems aspects. This algorithm permits to estimate frequency spectrum to support both existing and planned wireless access systems. Application of this algorithm f... View full abstract»

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  • Channel filters for microelectronic receivers of wireless systems

    Publication Year: 2005, Page(s):24 - 31
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (624 KB) | HTML iconHTML

    A short overview of receiver architectures and low-pass filter specifications for wireless systems is reported. Two design procedures of low-pass filters for communication system are discussed. A CMOS transconductance-capacitor (Gm-C) filter with enhanced linearity is presented as the first one. The proposed design is based on a transconductance amplifier with enhanced linearity. For th... View full abstract»

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  • Low consumption hybrid low-pass ARC-filters for 1 MHz band

    Publication Year: 2005, Page(s):32 - 35
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB) | HTML iconHTML

    In contemporary electronics low consumption analog CT ARC-filters are of a great significance for employing in areas of communication, instrumentation, security systems, etc. The design of such filters for operation in 1-MHz band is not a quite ordinary problem. The traditional solution is the design of complex CMOS schematics (filter itself, frequency tuning system, etc). Meanwhile the ARC-filter... View full abstract»

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  • Synthesis of wave analogue super narrow-band filters

    Publication Year: 2005, Page(s):36 - 41
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB) | HTML iconHTML

    The method of synthesis of wave super narrow-band filters of a chain type with arithmetic symmetric loss characteristics is considered. The example of calculation of optical super narrow-band filter with the Chebyshev characteristic is given. View full abstract»

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  • Fast RLS with parallel computations

    Publication Year: 2005, Page(s):42 - 45
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    The paper presents parallel forms of the sliding window fast RLS algorithms with the regularization of adaptive filter correlation matrix. The new algorithms are mathematically identical to the appropriate algorithms with sequential computations, but can be implemented by means of parallel processors. The algorithms are based on the using of the generalized matrix inversion lemma. They can be used... View full abstract»

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  • A Reconfigurable “ SFMD Architecture ” For a Class of Signal Processing Applications

    Publication Year: 2005, Page(s):46 - 49
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB) | HTML iconHTML

    The fastest programmable DSP processors are unable to meet the speed requirements of many advanced signal processing applications. SlMD machines have been a preferred solution in such applications because of their inherent spatial parallelism. In such machines, a control unit (CU) broadcasts simple machine instructions simultaneously to a number of processing elements (PEs) executing the same inst... View full abstract»

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  • Optimization of the downlink frame length in adaptive systems

    Publication Year: 2005, Page(s):50 - 53
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    Performance and limitations of adaptive multi-user multi-carrier downlink systems in time-variant wireless channel are considered. It is shown that maximization of system throughput requires either non-uniform error protection scheme, or the same long error-correction code with optimized rate should be used. View full abstract»

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  • adaptive linearization of a power amplifier based on compression of delta-sigma modulated signals

    Publication Year: 2005, Page(s):54 - 57
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB) | HTML iconHTML

    This paper describes a novel method of adaptive linearization of power amplifier based on mixed mode processing of band-pass delta-sigma pulse stream. Our simulation results have shown significant reduction in spreading of spectra of nonlinear amplifier when adaptive feedback is used. View full abstract»

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  • Simulation of linear and non-linear effects in switched-capacitor delta-sigma modulators

    Publication Year: 2005, Page(s):58 - 63
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB) | HTML iconHTML

    The paper presents a methodology and corresponding software tool for simulations of oversampled switched-capacitor delta-sigma modulator. It allows the analysis of non-ideal parameter influence. Among these parameters are parasitic capacitors, limited switch resistances, gain-bandwidth product of active devices. Special attention is passed to analysis of nonlinear properties of stray capacitances ... View full abstract»

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  • System identification with adaptive algorithms

    Publication Year: 2005, Page(s):64 - 67
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB) | HTML iconHTML

    The paper presents the adaptive LMS algorithm used for system identification. The unknown system is modeled by a FIR filter. After the presentation of the theoretical approach, simulations in Labview and Matlab are provided showing the performance of the method. View full abstract»

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  • Eigenfilter based blind channel estimator

    Publication Year: 2005, Page(s):68 - 71
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (560 KB) | HTML iconHTML

    An eigenfilter based blind channel estimation technique of estimating the channel state information for a single-input two-output system is considered by using second-order statistics information about the received signal. We showed that our design have either comparable or better estimation performance than another eigenfilter based estimation technique [M.K. Tsatsanis and Z. Xu, March 1999] with... View full abstract»

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  • MMSE equalizer for MIMO-ISI channel with shortened guard period

    Publication Year: 2005, Page(s):72 - 75
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (280 KB) | HTML iconHTML

    An FIR MMSE equalizer (FIR-MMSEE) for block based transmission under the MIMO ISI channel is proposed in this paper. The proposed MMSE equalizer can get rid of the IBI problem without requiring a guard period which is not less than the channel order. By shortening the guard period, the bandwidth efficiency can be improved effectively especially for the channel with large dispersion. In addition, w... View full abstract»

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  • Analysis of the design trajectory characteristics for the minimal-time system design algorithm

    Publication Year: 2005, Page(s):76 - 79
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (112 KB) | HTML iconHTML

    The problem of minimal-time system design algorithm construction was discussed. The different design trajectories have been analyzed within the limits of the new system design methodology. The special geometrical dividing surface was defined and analyzed on the basis of before discovered acceleration effect. Numerical results of both passive and active nonlinear circuit design prove the possibilit... View full abstract»

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  • On control vector structure for the minimal-time system design algorithm

    Publication Year: 2005, Page(s):80 - 83
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (112 KB) | HTML iconHTML

    Some important characteristic of the time-optimal system design algorithm were studied on basis of new design methodology. Three main Ideas acceleration effect, special selection of the design process start point and control vector switch points optimal position have been defined as the basic elements for the quasi-optimal algorithm construction. The design process optimal trajectory has been eval... View full abstract»

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  • A tunable pre-distorter for linearization of solid state power amplifier in mobile wireless OFDM

    Publication Year: 2005, Page(s):84 - 87
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB) | HTML iconHTML

    One of the major problems posed by orthogonal frequency division multiplexing (OFDM) is its high peak-to-average-power ratio (PAPR), which seriously limits the power efficiency of the solid state power amplifier (SSPA) because of the nonlinear distortion caused by high PAPR. In the present paper, we describe an analytical design approach that uses a sparse and yet accurate model for the pre-distor... View full abstract»

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  • A robust and secure scheme for image communication over wireless channels

    Publication Year: 2005, Page(s):88 - 91
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4568 KB) | HTML iconHTML

    Chaos based encryption may offer new quality in secure data transmission. Many chaotic image encryption and decryption algorithms have been reported in the literature. However, the feature of higher compression of the still image standard JPEG200 can not be achieved on the compression of chaotic images. The error resilient tools do not correct transmission errors. Furthermore, these tools do not a... View full abstract»

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