Recent advances in ultra wideband communications systems

Fontana, Robert J.; Ameti, A.; Richley, E. A.; Beard, Lawrence A.; Guy, Duncan

doi:10.1109/uwbst.2002.1006333

Cited by 73 publications

(33 citation statements)

References 2 publications

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“…The results of this paper are applicable to all systems that have a low spectral efficiency. Thus, in particular, our results hold for two practical applications, 1) UWB systems, where the bandwidth used is of the order of a few GHz, such as in the IEEE 802.15.3a standard [19]. For such a system, W → ∞, which implies that P0 N0W…”

Section: P0 N0wmentioning

confidence: 55%

“…Thus, there are currently intense research and development efforts underway, to design and standardize commercial UWB radios [16], [17], [18]. For example, the UWB based IEEE 802.15.3.a standard [19] is expected to support 100 to 500 Mbps depending on the link distance. Further, UWB radios will be inexpensive and low power, making them ideal for ad hoc wireless applications.…”

Section: Introductionmentioning

confidence: 99%

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Capacity of power constrained ad-hoc networks

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Abstract-Throughput capacity is a critical parameter for the design and evaluation of ad-hoc wireless networks. Consider n identical randomly located nodes, on a unit area, forming an adhoc wireless network. Assuming a fixed per node transmission capability of T bits per second at a fixed range, it has been shown that the uniform throughput capacity per node r(n) is Θ (log n) (α+1)/2 ) (achievable lower bound).These bounds demonstrate that throughput increases with node density n, in contrast to previously published results. This is the result of the large bandwidth, and the assumed power and rate adaptation, which alleviate interference. Thus, the significance of physical layer properties on the capacity of ad-hoc wireless networks is demonstrated.

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Section: P0 N0wmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Capacity of power constrained ad-hoc networks

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“…In prior research efforts on retro-reflective beamforming, pilot signals are always generated by a microwave oscillator [28,29]. Compared with microwave oscillators, impulse generators can be realized using relatively low-complexity and low-power circuitries [30] and hence is more suitable for mobile/portable devices. Because periodic impulses include information over multiple discrete frequencies, the wireless power transmitter has the flexibility of selecting multiple frequencies to transmit microwave power; in contrast, if the pilot signal is a continuous wave, the flexibility is limited to the pilot signal's frequency and its high-order harmonics.…”

Section: Retro-reflective Beamforming Scheme and Numerical Modelingmentioning

confidence: 99%

Microwave Power Transmission Based on Retro-reflective Beamforming

Wang¹,

Lu²

2016

Wireless Power Transfer - Fundamentals and Technologies

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Microwave power transmission has the potential to supply wireless power to portable/ mobile electronic devices over long distances (on the order of meters or even kilometers) efficiently. Nevertheless, several technical challenges remain to be resolved in order to accomplish practical microwave power transmission systems, including (i) minimizing power loss due to microwave propagation, (ii) preventing humans and other electrical systems from exposure to excessive microwave radiation, and (iii) reconfiguring wireless power transmission in reaction to environmental changes (such as physical movements of portable devices) in real time. In this chapter, a microwave power transmission scheme based on retro-reflective beamforming is proposed to address the above challenges. In the retro-reflective beamforming, wireless power transmission is guided by pilot signals. To be specific, one or more than one mobile device(s) broadcast pilot signals to their surroundings, and based on analyzing the pilot signals, a wireless power transmitter delivers focused power beam(s) onto the mobile device(s). Preliminary numerical and experimental results are presented to demonstrate the feasibility of the proposed retroreflective beamforming scheme.

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“…Ultra-wideband frequency spectrum finds several key applications in many modern and emerging technologies, such as tactical and strategic communications [1], through-the-wall imaging [2], medical treatments [3,4], and high data rate transmission [5,6]. Consequently, the need for microwave components that support such a range of frequencies is of utmost importance.…”

Section: Introductionmentioning

confidence: 99%

Non-Uniform Transmission Line Ultra-Wideband Wilkinson Power Divider

Shamaileh¹,

Almalkawi²,

Devabhaktuni³

et al. 2013

PIER C

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Abstract-We propose a technique with clear guidelines to design a compact planar Wilkinson power divider (WPD) for ultra-wideband (UWB) applications. The design procedure is accomplished by replacing the uniform transmission lines in each arm of the conventional power divider with varying-impedance profiles governed by a truncated Fourier series. Such non-uniform transmission lines (NTLs) are obtained through the even mode analysis, whereas three isolation resistors are optimized in the odd mode circuit to achieve proper isolation and output ports matching over the frequency range of interest. For verification purposes, an in-phase equal split WPD is designed, simulated, and measured. Simulation and measurement results show that the input and output ports matching as well as the isolation are below −10 dB, whereas the transmission parameters are in the range of (−3.2 dB, −4.2 dB) across the 3.1 GHz-10.6 GHz band.

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Recent advances in ultra wideband communications systems

Cited by 73 publications

References 2 publications

Capacity of power constrained ad-hoc networks

Capacity of power constrained ad-hoc networks

Microwave Power Transmission Based on Retro-reflective Beamforming

Non-Uniform Transmission Line Ultra-Wideband Wilkinson Power Divider

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