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Ultra-Wideband (ICUWB), 2012 IEEE International Conference on

Date 17-20 Sept. 2012

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Displaying Results 1 - 25 of 118
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    Publication Year: 2012 , Page(s): 1
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  • Session list

    Publication Year: 2012 , Page(s): 1
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  • Table of contents

    Publication Year: 2012 , Page(s): 1 - 31
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  • Author index

    Publication Year: 2012 , Page(s): 1 - 8
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  • Detailed author index

    Publication Year: 2012 , Page(s): 1 - 52
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  • Framework of belief condensation filtering and deterministic discrete filters

    Publication Year: 2012 , Page(s): 1 - 119
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (341 KB)  

    Summary form only given. Internet traffic is dramatically increasing, and the fastest growing segment, mobile network traffic, is expected to double every year for the next five years. In the next decade, more than twenty billion smart mobile devices will be connected to the Internet. This exponential growth is requiring new innovation throughout embedded devices and the supporting infrastructure to keep pace with the growing demand. View full abstract»

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  • 2012 IEEE International Conference on Ultra-Wideband - Book of abstracts

    Publication Year: 2012 , Page(s): 1 - 23
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    Summary form only given. Presents the abstracts for all papers included in the conference proceedings. View full abstract»

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  • 2012 IEEE International Conference on Ultra-Wideband [front matter]

    Publication Year: 2012 , Page(s): 1 - 36
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  • Framework of belief condensation filtering and deterministic discrete filters

    Publication Year: 2012 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    Inferring a sequence of variables from observations is a prevalent task in a multitude of applications. However, in some nonlinear or non-Gaussian scenarios, traditional techniques such as Kalman filters (KFs) and particle filters (PFs) fail to provide satisfactory performance. Moreover, there is a lack of a unifying framework for the analysis and development of different filtering techniques. In this paper, we present a general framework for filtering that allows to formulate an optimality criterium leading to the concept of belief condensation filtering (BCF). Moreover, we develop discrete BCFs that are optimal under such framework. Finally, simulation results are presented for the important filtering task that arises in ultrawide bandwidth (UWB) ranging. We show that BCF can obtain accuracies approaching the theoretical benchmark but with a smaller complexity than PFs. View full abstract»

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  • Scheduled UWB pulse transmissions for cooperative localization

    Publication Year: 2012 , Page(s): 6 - 10
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (458 KB) |  | HTML iconHTML  

    In this paper we have proposed a technique for cooperative localization where localization is done in distributive fashion without using any additional broadcast by nodes. The method relies on a fixed scheduled ultra-wideband (UWB) pulse transmissions by nodes in a predetermined way. The advantages of the proposed method is simpler hardware, comparatively less pulse transmission in the system hence energy efficient and faster update rate. View full abstract»

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  • A study on SNR estimation for cognitive radio

    Publication Year: 2012 , Page(s): 11 - 15
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (587 KB) |  | HTML iconHTML  

    In detect and avoid techniques of ultra-wide-band systems, there are some avoidance techniques which require information of both a primary signal and a noise level in order to control the transmitted power. Thus, we need to estimate the primary signal power and the noise variance with a high degree of accuracy. In this paper, we propose a new estimation method of primary signal to noise ratio. Our proposed method assumes several models of observed carriers, adopts the maximum likelihood criterion to estimate parameters in each model and selects the most suitable model based on the Akaike information criterion. By computer simulations, we evaluate the proposed estimator and show that the proposed method can estimate the parameters with a high degree of accuracy in several situations. View full abstract»

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  • Frontend ICs for impulse radio sensing and communications

    Publication Year: 2012 , Page(s): 21 - 25
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (386 KB) |  | HTML iconHTML  

    The chipsets discussed in this paper follow the philosophy that the beauty of impulse radio ultra-wideband lies in its simplicity. They provide fully differential circuit solutions in a low-cost SiGe heterostructure bipolar transistor technology addressing short range radar sensors as well as communication links. At the core, an efficient pulse generator concept allows for spectral tunability as well as biphase modulated pulses. Receiver concepts implement correlation detection for radar and biphase modulation, and energy detection for on-off keying communications and localization. Finally, a successful approach to rapid turn-around transmit/receive modules for monostatic IR UWB radars is presented. View full abstract»

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  • A reconfigurable impulse radio transmitter

    Publication Year: 2012 , Page(s): 26 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (604 KB) |  | HTML iconHTML  

    To investigate impulse radio (IR) communication transceivers, bit error rate (BER) measurements are typically performed by connecting an arbitrary waveform generator and a digitizing oscilloscope. In this paper a reconfigurable software defined radio (SDR) transmitter specifically designed for IR communication tests is presented. The prototype offers the possibility to transmit arbitrary 4-ary modulated impulses with 1 GHz bandwidth over four channels in the frequency range from 6 GHz-10 GHz. For generation of intermediate frequency (IF) signals a subsampling concept with a multi-Nyquist digital to analog converter (DAC) and a field programmable gate array (FPGA) has been employed. Pseudo-coherent signals are synthesized at radio frequency (RF) by utilizing a mixer with a local oscillator (LO) frequency locked to the LO of the DAC. A comparison of theoretically derived signals and measurements shows that both are in close agreement. View full abstract»

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  • Development of a radio front end for a UWB ranging embedded test bed

    Publication Year: 2012 , Page(s): 31 - 35
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB) |  | HTML iconHTML  

    In this paper, we present a modular test bed for ultra wideband ranging. The test bed comprises a 6.5 GHz radio front end interfacing with a baseband pulse transceiver and round-trip-time measurement module and with a flexible digital control and processing platform. The proposed radio front end allows to reduce antenna size and interference from narrowband users, with respect to the baseband pulse transceiver. We provide experimental characterization results, therefore proving the concept for the proposed front end architecture in the context of the considered UWB test bed. View full abstract»

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  • Frequency notching applicable to CMOS implementation of WLAN compatible IR-UWB pulse generators

    Publication Year: 2012 , Page(s): 36 - 40
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (733 KB) |  | HTML iconHTML  

    Due to overlapping frequency bands, IEEE 802.11a WLAN and Ultra Wide-Band systems potentially suffer from mutual interference problems. This paper proposes a method for inserting frequency notches into the IR-UWB power spectrum to ensure compatibility with WLAN systems. In contrast to conventional approaches where complicated waveform equations are used, the proposed method uses a dual-pulse frequency notching approach to achieve frequency suppression in selected bands. The proposed method offers a solution that is generically applicable to UWB pulse generators using different pulse waveforms. In addition the method can be easily implemented. A prototype UWB pulse generator designed using the proposed method has been fabricated in a standard 0.18 μm CMOS process for verification, and satisfactory results are found. View full abstract»

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  • Comparative overview of UWB and VLC for data-intensive and security-sensitive applications

    Publication Year: 2012 , Page(s): 41 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (110 KB) |  | HTML iconHTML  

    This paper provides a comparative overview of two short-range wireless technologies with high potential for use in various data-intensive and security-sensitive applications, namely, ultra wideband (UWB) and visible light communications (VLC). Both are emerging technologies with some unique features that draw a great research and commercial interest, also because of their applicability to the research in other fields, such as wireless robotics and communications, remote sensing and location-based communications, the medical field, and so forth. The paper outlines the most recent research and standardization developments for both technologies and gives a proposal for their suitability based on a comparative view, of the strengths and weaknesses for use in applications, such as home networking, vehicular communications, and medical care, including the main technical challenges. View full abstract»

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  • Coexistence of IEEE Std 802.15.6TM-2012 UWB-PHY with other UWB systems

    Publication Year: 2012 , Page(s): 46 - 50
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (608 KB) |  | HTML iconHTML  

    The paper describes a coexistence study of IEEE Std 802.15.6-2012 UWB devices with other UWB systems, in particular IEEE Std 802.15.4a-2007 (pico-nets) devices and IEEE 802.15.4f-2012 (RFID) devices. The recently published IEEE Std 802.15.6™-2012 includes IR-UWB and FM-UWB technologies. The IR-UWB transceivers for BANs are based on the transmission of a single and relative long pulse per symbol (new paradigm in UWB) or a concatenation or burst of short pulses per symbol (legacy), while FM-UWB transceivers are based on the concatenation of a CP-2FSK signal and a wideband FM signal. Thus, coexistence between UWB devices becomes very important for reliable operation in medical applications. View full abstract»

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  • Ultra-wide bandwidth timing networks

    Publication Year: 2012 , Page(s): 51 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (401 KB) |  | HTML iconHTML  

    We present an algorithm for ultra-precise timing in large wireless networks. Our approach uses physical-layer UWB round-trip time-of-flight measurements to achieve precise timing between any two nodes, and fast re-timing based on UWB pulse broadcasting and diversity combining, allowing the precise timing to “propagate” through even large-scale networks. The algorithm also ensures that a virtual timing network evolves from a large set of randomly placed nodes. Simulation results show that the algorithm converges and maintains network timing, regardless of the size of the network. View full abstract»

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  • Capacity and capacity-achieving input distribution of the energy detector

    Publication Year: 2012 , Page(s): 57 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (180 KB) |  | HTML iconHTML  

    This paper presents the channel capacity and capacity-achieving input distribution of an energy detection receiver structure. A proper statistical model is introduced which makes it possible to treat the energy detector as a constrained continuous communication channel. To solve this non-linear optimization we used the Blahut-Arimoto algorithm extended with a particle method, so that also continuous channels can be handled. To get a better convergence behavior of the algorithm, we also implement two new methods, which are called “fuse particles” and “kick particles” [1]. The results we present show that the capacity of the energy detector decreases with increasing integration time and decreasing peak-to-average power ratio. It is shown that the capacity-achieving input distribution is discrete with a finite number of mass points. View full abstract»

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  • Adaptive synchronization and integration region optimization for energy detection IR-UWB receivers

    Publication Year: 2012 , Page(s): 62 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (375 KB) |  | HTML iconHTML  

    Non-coherent energy detection (ED) IR-UWB receivers exhibit strong advantages in low data rate, low power and low cost applications such as RFID and Wireless Sensor Networks. However, the performance of ED receivers is usually suffered from the noise enhancement due to the large time-bandwidth product. The integration region of the receiver integrator significantly affects the bit error rate (BER) performance. This paper presents a method of synchronization and estimating the optimal integration region (i.e., the starting point and the length of the integration window), which is based on the analysis of received signal energy capture and combined with a time of arrival (TOA) estimation. The proposed scheme is based on the symbol rate sampling and does not require a priori information about the channel delay profile. Besides, it can adapt to various indoor channel environments. The algorithm has a moderate accuracy but a very low complexity and fast synchronization speed. The validity of the proposed approach is demonstrated by numerical results using IEEE 802.15.4a channel models. View full abstract»

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  • Narrowband interference mitigation in UWB communication with energy detector

    Publication Year: 2012 , Page(s): 67 - 71
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (361 KB) |  | HTML iconHTML  

    Ultra wideband (UWB) is a reliable candidate for supporting a physical layer in Body Area Networks (BAN) and because of their wideband, UWB systems can have their performance degraded due to the interference from narrowband transmission. Methods must be developed to protect UWB systems that are exposed to this negative impact of the narrowband interference (NBI). Most proposed solutions have been developed for coherent and transmitted-reference receivers but a very few of these principles are eligible with the noncoherent energy detector (ED) receiver. The work presented thereafter aims at proposing a novel method to identify and mitigate the narrowband interference in ultra wideband transmissions. We use an efficient algorithm with a modified but still simple energy detector, and the performance of the method is evaluated by means of computer simulations. View full abstract»

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  • UWB antenna for wireless communication and detection applications

    Publication Year: 2012 , Page(s): 72 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB) |  | HTML iconHTML  

    Several ultrawide band (UWB, 3.1-10.6 GHz) antennas are presented for either wireless communications or detection applications. An UWB antenna could be either a planer structure for portable devices or has a 3D configuration, which is suitable for an access point. Dielectric resonator is used to tremendously shrink an UWB antenna's size, which is important for a terminal device. Different DR loading schemes of a planer UWB antenna is discussed. The application of such a DR UWB antenna in breast cancer detection is also investigated. For wireless communication, antenna techniques to reject the interferences from WLAN bands are presented for printed UWB antennas. Lastly, an omnidirectional UWB antenna with a nonplaner structure is presented for an UWB access point. View full abstract»

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  • On the use of spiral antennas in ultra-wideband communication links

    Publication Year: 2012 , Page(s): 82 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (636 KB) |  | HTML iconHTML  

    This paper discusses the pulse distortion of two-arm spiral antennas in ultra-wideband (UWB) communication links and mitigation thereof by modifying the antenna so that phase and amplitude distortions are accounted for by the aperture itself. A new spiral topology, named power-spiral, is introduced to reduce the effect of the phase distortions. When combined with classical Archimedean spiral, this antenna has simultaneously high-quality time and frequency domain performance. To compensate the amplitude distortion resulting from frequency-dependent path loss of a UWB communication channel, lens-loaded spiral and spiral array are investigated. Obtained results clearly show the time-domain performance improvement with all studied approaches. View full abstract»

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  • Ultra wide band TEM horn antenna designs for ground penetrating impulse radar

    Publication Year: 2012 , Page(s): 87 - 91
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (283 KB) |  | HTML iconHTML  

    This paper deals with ultra-wide band (UWB) TEM horn antenna types, which are suitable for hand-held and vehicle mounted impulse GPR systems. On this scope, conventional, dielectric loaded, Vivaldi form, multi-sensor adaptive and array configurations of the TEM horn structure are designed, simulated and measured. Vivaldi shaped TEM horn fed ridged horn and parabolic reflector antenna prototypes are proposed to reach hyper-wide band impulse radiation performances from 300 MHz up to 20 GHz for multi-band GPR operation that can provide high resolution imaging. The gain and input reflection performances are demonstrated with measurement results. View full abstract»

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  • Ultra-wide stopband in a compact low pass filter using stepped impedance resonators and novel techniques

    Publication Year: 2012 , Page(s): 92 - 94
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (157 KB) |  | HTML iconHTML  

    The design procedure of a compact ultra-wideband (UWB) stepped impedance resonator (SIR) low pass filter, is presented in this paper. A SIR LPF with 7 GHz cutoff frequency miniaturized by meander line technique is designed and it is shown that offsetting the stepped impedance resonators, as well as indenting the tap location greatly improve rejection bandwidth. Offsetting input lines further maximizes rejection bandwidth. The proposed filter is simulated in Sonnet EM software, fabricated, and tested on a high dielectric ceramic. The results show an improved stopband performance compared with similar topologies with a drastic size reduction in the filter. View full abstract»

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