Báo cáo hóa học: " An orthogonal spectrum sharing scheme for wireless sensor networks" potx

... Ting 1 , Yang Han 1 and Ashish Pandharipande 2 Abstract It is not economically viable to allocate a dedicated spectrum band to wireless sensor networks (WSNs). Moreover, sharing a spectrum band wi ... et al.: An orthogonal spectrum sharing scheme for wireless sensor networks. EURASIP Journal on Wireless Communications and Networking 2011 2011:10. Submit your manusc...

Ngày tải lên: 21/06/2014, 03:20

... least partial channel information of present channel estimation algorithms for two-way relay channels. Both exploit the nature of reciprocal channels and both consider OFDM transmission strategies, ... exploiting the broadcast nature of wireless radio waveform so that the overall system performance including power efficiency and communication reliability can be significantly improved. Howeve...

Ngày tải lên: 21/06/2014, 11:20

... performance gain compared to a uniform power allocation scheme. 1. Introduction Wireless sensor networking is an emerging technology which finds application in many fields including environment and ... monitoring and surveillance, and underwater wireless sensor networks (UWSNs) for marine environment monitoring [1, 2]. A wireless sensor network (WSN) consists of spatially dist...

Ngày tải lên: 21/06/2014, 17:20

... Calif, USA, September 2003. [8] F. Zhao and L. Guibas, Wireless Sensor Networks: An Informa- tion Processing Approach, chapter 2, Morgan Kaufmann, San Francisco, Calif, USA, 2004. [9] K. Passino, ... from x(k) and are within an angle θ − φ and θ + φ as shown in Figure 2. Note that the parameters ρ and φ can be used to also model the maneuverability constraints of the mobile platform....

Ngày tải lên: 21/06/2014, 22:20

... Ultra-Wideband (UWB) sensor networks is an important area that attracts significant research interest. It is required in many sensor network applications, such as indoor navigation and surveillance, detection ... figure, we can see that the HT and HC methods provide better performance than other methods. The HC method, a combination of the HT and the CT method, can further improve the per...

Ngày tải lên: 21/06/2014, 23:20

... convergence cannot be guaranteed for all values of 0 <ε<1and0<μ<1. We refer to Appendix C for further analysis on this point. Here, we illustrate this is- sue by means of an example. ... and μ that guarantee the condition |  λ(λ, μ)| < 1foranyλ in (C.4) (except λ = 1).However,anumericalstudycanbeeasilycar- ried out from (C.3)and(C.4). For illustration, consider an un...

Ngày tải lên: 22/06/2014, 19:20

... Rome, Italy, July 2001. [8] M. Zorzi and R. R. Rao, “Geographic random forwarding (GeRaF) for ad hoc and sensor networks: multihop perfor- mance,” IEEE Transactions on Mobile Computing, vol. ... under the sensor networks cir- cumstances in [12], and gave the mean and variance of mul- tihop distance for 1D Poisson point distribution. They also proposed to approximate the multihop dista...

Ngày tải lên: 22/06/2014, 19:20

... Professor Alex Grant. He received a 1997 Career Award, and a Canada Research Chair in 2001. He is an Associate Editor for coding theory and techniques for IEEE Transactions on Communications, and a Guest ... dis- tances at various frequencies and environments. Path loss exponents range from n = 2 for free space to n = 4for office space with many obstacles and ranging over multiple floor...

Ngày tải lên: 22/06/2014, 22:20

... ongoing effort to develop an analytical framework for interference modeling and performance evaluation in the unlicensed band, as it is seen as an invaluable tool for dynamic spectrum access system ... bandwidth, and limited transmission range [8]. In an interference rich scenario such as ISM band, beamforming is expected to play an important role. Beamforming uses arrays of ante...

Ngày tải lên: 21/06/2014, 19:20

... approach was planned and executed i n five cases and an ilioinguinal approach in one case. In one case a combined Stoppa and posterior approach was planned and executed (Table 2). The planned frac- ture ... CT and preoperative planning showing the osteosynthesis implants as planned (blue) and as executed (orange). Oblique lateral view. Fornaro et al. Journal of Orthopaedic Surgery and Resea...

Ngày tải lên: 20/06/2014, 04:20