data communications and networking quiz

... Trang 1DATA COMMUNICATIONSAND NETWORKING Second Edition FM Page i Wednesday, February 23, 2000 2:30 PM Trang 2FM Page ii Wednesday, February 23, 2000 2:30 PMTrang 3DATA COMMUNICATIONSAND NETWORKING ... Choice 60 Exercises 63 Chapter 4 Signals 65 4.1 ANALOG AND DIGITAL 65 Analog and Digital Data 66 Analog and Digital Signals 66 4.2 APERIODIC AND PERIODIC SIGNALS 66 Periodic Signals 67 Aperiodic ... 5 Encoding and Modulating 91 Chapter 6 Transmission of Digital Data: Interfaces and Modems 139 Chapter 7 Transmission Media 187 Chapter 8 Multiplexing 231 Chapter 9 Error Detection and Correction

Ngày tải lên: 24/10/2017, 13:15

... Headers and trailers are control data added at the beginning and the end of each data unit at each layer of the sender and removed at the corresponding layers of thereceiver They provide source and ... layer b Error correction and retransmission: data link and transport layers Trang 7d Responsibility for carrying frames between adjacent nodes: data link layer19 a Format and code conversion services: ... presentation layer b Establishing, managing, and terminating sessions: session layer c Ensuring reliable transmission of data: data link and transport layers d Log-in and log-out procedures: session layer

Ngày tải lên: 12/04/2023, 21:01

... ISSN: 0018-9448 Standard ECMA-368 High Rate Ultra Wideband PHY and MAC Standard, 3rd edition, Dec 2008 Trang 2Tse, D N C & Viswanath, P (2005). Fundamentals of Wireless Communications., U.K.: ... 3High Throughput Transmissions in OFDM based Random Access Wireless Networks Nuno Souto1,2, Rui Dinis2,3, João Carlos Silva1,2, Paulo Carvalho3 and Alexandre Lourenço1,2 to complete the transmission ... a BS, which is responsible for running most of the calculations and to handle transmission collisions The BS detects collisions and uses a broadcast control channel to send a collision signal,

Ngày tải lên: 20/06/2014, 11:20

... subcarrier matching and power allocation h λ = − (23) 0 , h λ where P s i up, and P r j up, are the power allocations for i and j at the source and the relay The parameters λs and λr can be obtained ... are denoted as hs,1 and hs,2, and the channel power gains over the relay-destination channel are denoted as hr,1 and hr,2 Without loss of generality, we assume that hs,1 ≥ hs,2 and hr,1 ≥ hr,2, ... other fading distribution, and the same subcarrier matching and power allocation scheme can be adopted The total bandwidth is B = 1MHz The SNR s is defined as P s /(N0B) and SNRr is defined as P

Ngày tải lên: 20/06/2014, 11:20

... mobile broadband services at prices and speeds comparable to fixed broadband Though there are often data caps on mobile broadband services that are lower than those of fixed broadband, some consumers ... Efficient protocols and outage behavior, IEEE Transactions of Information Theory 50: 3062–3080 Liu, K J R., Sadek, A K., Su, W and Kwasinski, A (2009) Cooperative Communications and Networking, Canbridge ... on Wireless Communications Letters 8: 2783–2788 Suraweera, H., Louie, R., Li, Y., Karagiannidis, G and Vucetic, B (2009) Two hop amplify-and-forward transmission in mixed Rayleigh and Rician

Ngày tải lên: 20/06/2014, 11:20

... hardware, bandwidth, and channel conditions If we assume a basic link rate of 1 Mb/s (control frames are recommended to be transmitted at the basic link rate in narrow-band as well as broadband 802.11 ... minimum and maximum sizes of the contention window of a node are 32 and 1024 timeslots, respectively, while a timeslot is 20μs In addition, the retransmission limits are 7 and 4 for a RTS frame and ... performance of the modified protocol The nodes in the network have random waypoint movement and have a minimum and a maximum speed of 1.0 and 5.0 m/s, respectively (the average pause time is 0.5 second)

Ngày tải lên: 20/06/2014, 11:20

... Kij 2 σ ij and q = 1 2 , (7) 394 Communications and Networking 4 Ranging post-processing... measurements under both LOS and nonLOS channel conditions, ultra-wideband (UWB) and chirp ... themselves and that a server is available to run the LT engine, the LT problem reduces to 390 Communications and Networking find the position of the... Sensitivity to NLOS Wideband Wideband Narrowband ... provider of The Cloud and accordingly is a service provider in the wireless city. However Communications and Networking 386 customers now make Skype calls in some mobile handsets, which means

Ngày tải lên: 20/06/2014, 11:20

... acceptable for GPS data Binary files were converted to text file for easy handling and processing For GPS data storage and transmission, the most generally used GPS exchange data type is the RINEX ... stations across New Zealand All seismic and GPS data are transmitted continuously to two data centers using radio, land-based or VSAT systems employing Internet Protocol data transfer techniques ... space and transmission bandwidth requirements as only the difference between the current observation data and the first occurrence of it is stored 3 Sumatran cGPS array - introduction and configuration

Ngày tải lên: 20/06/2014, 11:20

... location aware vehic-ular architecture standardized by ETSI, commonlyreferred to as geonetworking, and then describes indetail how IPv6 datagram transmission and standardIPv6 stateless address autoconfiguration ... accidents, improve the efficiency and comfort of road transport, and also enhance the passengers’ communications experience Although many applications of vehicular communications were already identified ... of relying on centralized entities Working groups and standardization bodies such as IEEE 1609,a ISO TC204,bETSI TC ITSc and the Car-to-Car Communications Consortiumd(C2C-CC)have been working

Ngày tải lên: 20/06/2014, 20:20

... essential to clarify that the term “data sample” differs from the term “data” in the fact that a data sample consists of more than one data In fact, each data sample is a combination of values, ... 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, ... Learning mechanisms also provide the ground for enabling proactive handling of problematic situations, i.e identifying and handling issues that could undermine the performance of the system before

Ngày tải lên: 20/06/2014, 20:20

... having a mean µ and a standard deviation Σ Table 3 shows that the different states of the Markov chain depend on the elevation angles and that each state has its specified mean and standard deviation ... Land Mobile Radio Communications, Commission of European Communities, Directorate General, Telecommunications Information Industries and Innovation, Luxemburg Khalighi M A., Hélard J.-F., and ... propagation data at L-band (1542 MHz) for mobile satellite communications, Proc of IEEE Vehicular Technology Conference, pp 51-56, ISSN: 1090-3038, May 1991, Saint Louis, USA Trang 7fractional bandwidth

Ngày tải lên: 21/06/2014, 01:20

... designed for non-real-time data transmission service such as FTP, the QoS parameters contains minimum reserved data rate and maximum sustained data rate Unlike rtPS and UGS, which required the ... López-Ferreras, and G Esteve-Asensio (2009) Novel Heuristics for Cell Radius Determination in WCDMA Systems and Their Application to Strategic Planning Studies, EURASIP Journal on Wireless Communications and ... be implemented Due to the fast growing of bandwidth and transmission rate in today’s communication system, the processing speed of packets becomes more and more critical Thus, the complexity of

Ngày tải lên: 21/06/2014, 01:20

... 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 ... test scenarios with N = 128 subcarriers,C = {1, 2, 4, 6}, andrmin=50,rmax =200 for each user and K = 3 and K = 4 users, respectively, and using the channel model described in Section 5.2 for over

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

... p=TDATA+ SIFS, T a=TBAR+TB-ACK+ 2·SIFS, (4) whereTDATA,TBAR, andTB-ACKare durations of DATA, BAR and B-ACK transmissions, SIFS and DIFS are interframe spaces specified in the IEEE 802.11 standard; ... J0) we estimate PLR and throughput for every recipient by (12), (14) and (17) and check if QoS requirements (1) and (2) are met In this way we form an admitted region ofT, B and J. InFigure 5, ... there are a lot of other data in it Forming the DL- and UL-MAP, the base station allocates the necessary channel to transmit a multicast data burst in the downlink subframe and to receive ACKs from

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) and orthogonal frequency division multiple access (OFDMA) have been selected for downlink and frequency domain packet scheduling (FDPS) have been proposed SDM simply divides the data stream ... 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

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

... the data plane), and routing The data plane functions that deal with data bundles are executed in BAD These functions include data bundles aggregation/de-aggregation, queuing and scheduling, and ... 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 ... approach; (ii) end-to-end, asynchronous, and variable-length bundle oriented communication; and (iii) separation between control and data planes using out-of-band signaling Different to DTN architecture

Ngày tải lên: 21/06/2014, 17:20

... 1Chapter 2: Fundamentals of Data and SignalsTRUE/FALSE 1 The terms “data” and “signal” mean the same thing 2 By convention, the minimum and maximum values of analog data and signals are presented ... network It is important to understand that the terms “data” and “signal” do not mean the same thing, and that in order for a computer network to transmit data, the data must first be converted into ... modulates digital data onto an analog signal and then demodulates the analog signal back to digital data is a 26 Three currently popular modulation techniques for encoding digital data and transmitting

Ngày tải lên: 19/10/2017, 16:27

... in whatever form is agreed upon by the parties creating  and  using  the  data.  and  using  the  data.  Data  communications Data  communications  are  the  exchange of data between two devices via some form of  ... 181-4 PROTOCOLS AND STANDARDS In this section, we define two widely used terms:  In this section, we define two widely used terms: protocols protocols   and  and  standards standards .  First,  ... Components Data Representation Data Flow Topics discussed in this section: Trang 3Figure 1.1  Five components of data communication Trang 4Figure 1.2  Data flow (simplex, half­duplex, and full­duplex)

Ngày tải lên: 23/09/2020, 13:31