wireless communications and networks

... for Broadband Wireless Communications, John Wiley, ISBN 978-0-471-21479-3, New Jersey, USA Godara, L C (1997) Application of Antenna Arrays to Mobile Communications II Beam-Forming and Direction-of-Arrival ... Foschini, G J & Gans, M J (1998) On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas Wireless Personal Communications, Vol.6, No.3, (March 1998), pp.311-335, ... Transmission IEEE Transactions on Communications, Vol 47, No 10, (Oct 1999), pp.1458-1461, ISSN 0090-6778 Rappaport, T S (2002) Wireless Communications: Principles and Practice (2nd Edition), Prentice

Ngày tải lên: 19/06/2014, 19:20

... modulation type and order, the pulse shapeand the packet format So that, if this information is not accurate, then the matched filterperforms poorly However, since most wireless networks systems ... the random variable m stands for the required number of samples needed to terminate the test As stated in Wald (2004) it is possible to neglect the excess on thresholdAandB,hence the the random ... real environment and its variation, while it is shown inmany publications and realistic measurements that such environments change frequently,especially in highly build areas Understanding how particular

Ngày tải lên: 19/06/2014, 19:20

... Standard for Local and metropolitan area networks Part 16: Air interface for fixed broadband wireless access systems IEEE Std 802.21-2008 (2008) IEEE Standard for Local and metropolitan area networks ... near future, wireless accessnetworks will be composed of diverse wireless medias To exploit wireless media diversity in expected access networks, some bandwidth-aggregationmethods in wireless media ... Trang 4Recent Advances in Wireless Communications and Networks 262 but it consumes less bandwidth Table 7 includes the average times for a multiple-file transmission and the corresponding confidence

Ngày tải lên: 19/06/2014, 19:20

... Trang 13Wireless Sensor Network: At a Glance 301 Trang 14Recent Advances in Wireless Communications and Networks Trang 15Wireless Sensor Network: At a Glance 303 Wireless Sensor Networks we ... related to wireless sensor nodes (Tatiana), except this a comprehensive listing of existing wireless sensor nodes is presented Trang 12Recent Advances in Wireless Communications and Networks 300 ... Area Networks, Part 16: Air Interface for Fixed Broadband Wireless Access Systems, 2004 IIEEE Std 802.16e-2005 (2005) Local and Metropolitan Area Networks, Part 16: Air Interface for Fixed and

Ngày tải lên: 19/06/2014, 19:20

... Trang 3Wireless Sensor Network: At a Glance 321 Trang 4Recent Advances in Wireless Communications and Networks 322 Fig 4 Security threats and their usual defenses in Wireless Sensor Networks ... J.N and Kamal, A.E (2004) Routing Techniques in Wireles Sensor Networks: A Survey, IEEE Wireless Communications (J), pp 06-28 Karl, H and Willig, A (2006) Protocols and Architectures for Wireless ... Scenario: Prospects and Challenges, Proceedings of National Conference on Wireless Communication and Networking (WINCON), pp 138-148 Trang 8Recent Advances in Wireless Communications and Networks 326

Ngày tải lên: 19/06/2014, 19:20

... of VoIP and non-VoIP connections is represented by r and s, respectively Additionally, BW T and BW R represent the overall and the reserved bandwidth, while BW and 1 BW represent the bandwidth ... index i corresponds to different service types and can take values 1 and 2 for VoIP and non-VoIP traffic, respectively In case that the system bandwidth suffices to serve the flows of all service ... Poutmin and Poutmax, depending on the available system bandwidth In the extreme case that we have no available bandwidth, the overall outage probability becomes Poutmax Adversely, when the total bandwidth

Ngày tải lên: 19/06/2014, 19:20

... source and the wireless systems is only a matter of electromagnetic compatibility standards, electrostatic discharges and security regulation 3.2 Systems, component and devices for wireless power ... and magnitude set the energy demands place upon the power supply Meanwhile, the time mask and slopes of the communication burst are relevant to control the switching harmonics of the signal and, ... to the consumption patterns of wireless systems, but the power source itself conditions the architecture of both wireless device and power supply Consequently, wireless systems are sorted in

Ngày tải lên: 19/06/2014, 19:20

... 2 and 6 Table 2 shows examples of measured n and σ values in different buildings for 914 MHz signals (Rappaport and Sandhu 1994) A link budget analysis can be used to estimate the range of wireless ... modules, and wireless sensing units (Fig 4) The server is used to organize and collect data from multiple wireless sensing units in the sensor network The server is responsible for: 1) commanding ... the server and the wireless sensing units must communicate frequently with each other, portions of their software are designed in tandem to allow seamless integration and coordination Wireless

Ngày tải lên: 19/06/2014, 19:20

... utilizing natural energies such as up-and-down motions of waves, slowly flowing river water, human and animal movements, and vibration energies produced from vehicles and buildings 4.1 Principal of ... cycle of stretching and contraction is Trang 6where C 1 and C 2 are the total capacitances of the dielectric elastomer films in the stretched and contracted states, respectively, and V b is the ... short period of time and in the basic circuit Since V = Q/C, the voltages in the stretched state and the contracted state can be expressed as V 1 and V 2, respectively, and the following equation

Ngày tải lên: 19/06/2014, 19:20

... uses a low-power, low bandwidth, and long-range link, and it is always active to allow node discovery The data plane uses high-power, high bandwidth, and short-range link, and it is only active ... networks to distribute multimedia content [4, 5], and monitoring networks for data collection [6] Vehicular networks can also be employed to provide connectivity to remote rural communities and ... prototyped hardware and software embedded into robotic cards, desktop, and netbooks computers The proposed prototype is demonstrated and evaluated with Epidemic, and Spray, and Wait routing protocols,

Ngày tải lên: 21/06/2014, 17:20

... perfectly Networks with various numbers of nodes and antennas are simulated and the average BER and the MSE parameter are used as the performance metrics and they are compared with MMSE–MMSE and ZF–ZF ... MMSE–MMSE and ZF–ZF methods Finally, networks with 4 and 6 relays are simulated In the former setup each relay has four antennas and in the later case three antennas For this case, The BER and MSE ... Control, and Computing, Monticello, IL, October 2003, pp 1576-1585 [6] T Issariyakul, V Krishnamurthy, Amplify-and-forward cooperative diversity wireless networks: model, analysis, and monotonicity

Ngày tải lên: 21/06/2014, 23:20

... backoff window size, that is constant and equal to the minimum value defined by the standard, denoted as CWmin, and corresponding to 32 The backoff period is slotted and the duration of the backoff, ... flatten for high values of c and for low values of ρs Also in this case, the BC value is randomly selected in {0, 1, , cw − 1} as mandated by the IEEE 802.11 standard (Section 4) 6 A recursive ... same, while D decreases and TE increases In other words, SIF performs better in dense networks On the other hand, in the case of the polynomial protocol (Figure 6), D and TE have an opposite

Ngày tải lên: 20/06/2014, 20:20

... char-acterization and evaluation of the solution standard-ized by the European Telecommunications Standards Institute for IPv6 transmission of packets over geo-graphical location aware vehicular networks ... interconnect vehicular networks tothe Internet The European Telecommunications Standards stitute (ETSI) TC ITS is the technical committeethat received a standardization mandate from theEuropean ... an tial inter-vehicular distance and a maximum wirelessradio coverage, assuming an ideal wireless technol-ogy (no packet losses nor collisions and infinite band-width) Although the simulator

Ngày tải lên: 20/06/2014, 20:20

... in IEEE 802.11 wireless networks based on the experimental measurements and the environmental conditions, and eventually selects the optional channel Finally, Bayesian statistics and self-organizing ... regarding the provision of services in mobile and wireless networks, such as voice, video streaming, web browsing, etc In general, in the scope of mobile networks and ubiquitous computing, similar schemes ... Fully formattedPDF and full text (HTML) versions will be made available soon. An overview of learning mechanisms for cognitive systems EURASIP Journal on Wireless Communications and Networking 2012,

Ngày tải lên: 20/06/2014, 20:20

... the widespread deployment of high data rate wireless networks and the improvements in video compression technologies, the popularity of and demand for wireless mul-timedia transmission have been ... Communications, vol 6, no 4, pp 13–18, 1999 [3] H Schwarz, D Marpe, and T Wiegand, “Overview of the scalable video coding extension of the H.264/AVC standard,” IEEE Transactions on Circuits and ... extension of the H.264 standard [3] is a suitable candidate In SVC, a scalable bit stream can be viewed as a hierarchy of video layers, consisting of a mandatory base layer and a number of enhancement

Ngày tải lên: 21/06/2014, 05:20

... Rx and Tx, respectively By choice, the intercluster parameters pc, φ A c, and τc are parametersac,k,φ A c,k,φ D c,k, andτc,k The matrices BRx, W, and BTxare built from submatrices BRx c , Wc, and ... measured location of the Tx and Rx The calibration of the network analyzer is done at the connectors of the Tx and Rx antenna and as such includes both the RF/optical link and the amplifier Measurements ... which stretches horizontally top and bottom in the figure All inner walls are plasterboard, except for the concrete walls between rooms 118 and 120, and of the Tx and Rx during measurements A total

Ngày tải lên: 21/06/2014, 05:20

... wireless networks because of the error-prone nature of wireless media and random access techniques commonly used in wireless protocols In wireless networks, an access method based on channel reservation ... Wide spreading of wireless networks increases diversity of wireless multimedia services However, it is very hard to meet strict QoS requirements of multimedia services in wireless networks because ... applications However, existing standards of high rate wireless networks provide no error recovery mechanism (ARQ) for multicast traffic ARQ absence in wireless networks unreliable by their nature

Ngày tải lên: 21/06/2014, 05:20

... open loop MIMO and closed loop for SU and MU MIMO schemes versus the number of active users in the cell Both the simulation results and the analytical results for the open loop and the linearly ... MIMO-OFDMA based downlink transmission Both open loop and closed loop MIMO (open loop and closed loop MIMO correspond to the MIMO systems without and with channel state information at the 3GPP LTE ... LTE However, the closed loop solution provides both diversity and array gains, and hence a superior performance Due to its simplicity and robust performance, the use of linear precoding has been

Ngày tải lên: 21/06/2014, 05:20

... Choi, and T Keller, OFDM and MC-CDMA for Broadband Multiuser Communications, WLANs and Broadcasting, IEEE Press-John Wiley & Sons, New York, NY, USA, 2003 [2] L Hanzo and T Keller, An OFDM and ... iterations then employed bee abandons that food source, and it becomes a scout and search for a new food source randomly This assigns a random food source to this scout, and it becomes employed After ... L Martins and C C Ribeiro, “Metaheuristics and appli-cations to optimization problems in telecommuniappli-cations,” in Handbook of Optimization in Telecommunications, M G C. Resende and P M Pardalos,

Ngày tải lên: 21/06/2014, 06:20

... according to the ISM band. 14. TL model for meander antennas Commercial and military mobile wireless systems demand for high compactness devices. An important component of any wireless system is ... Wave Antenna for Wireless Communications 47 Onofrio Losito and Vincenzo Dimiccoli Chapter 4 Superstrate Antennas for Wide Bandwidth and High Efficiency for 60 GHz Indoor Communications 93 ... Propagation constant and characteristics impedance are given by the following relations: Wireless Communications and Networks – Recent Advances 80 4 cell with 8 fingers and 4 cell with 6 fingers...

Ngày tải lên: 31/03/2014, 22:20