mobility increases the capacity of ad hoc wireless networks pdf

... of them is eliminated by optimizing over the secondary metric (say delay), and so on. The mobility of mobile ad hoc networks adds another dimension of difficulty. Highly mobile hosts in the ad ... appear on the market. These technologies constitute the building blocks to construct small multi-hop ad hoc networks that extend the range of the ad hoc networks technologies over a few radio hops ... single-hop ad hoc wireless networks. The first part of this chapter presents the taxonomy of single-hop wireless technologies. Specifically, we introduce the concept of Body, Personal, and Local wireless...

Ngày tải lên: 03/06/2014, 01:08

... K. Madsen, F. H. P. Fitzek, and R. Prasad, “Impact of different mobility models on connectivity probability of a wireless ad hoc network,” in Proceedings of the International Workshop on Wireless ... shows the values of all parameters used in the simulation. The following metrics are computed to evaluate the impact of each mobility model on the performance of the Bypass-AODV as well as the ... The routing overhead ratio is the ratio of the amount in bytes of control packets transmitted to the amount in bytes of data packets received. This measure is important to estimate the cost of...

Ngày tải lên: 21/06/2014, 11:20

... an ad hoc network, as we shall see below. I address the general issue of routing in mobile ad hoc networks separately in the next section. The shared wireless environment of mobile ad hoc networks ... quality of service in ad hoc wireless networks. Starting with a review of the basic principles of ad hoc wireless networking, coverage progresses to the vulnerabilities these networks face and the ... to incorporate some of these schemes of wireless and wire-line networks. I devote several chapters of this book to address incorporation of these schemes in ad hoc networks. In the following, I...

Ngày tải lên: 25/03/2014, 12:07

... is the TCP’ s estimation of the end-to-end RTT delay at time t n ,L n the size of the data, t n-1 the arrival time of the previous ack, and t n the arrival time of nth packet at the receiver. The ... Recover, the sender sets the size of cwnd to the value of ssthresh and then goes to CA phase. On the other hand, if the current queue length is less than the threshold value at the time of receiving ... delay, the sender receives add-dupacks and for each add- dupacks the sender sends new packet allowed by the value of cwnd. When the add-dupacks greater than or equal to the value of delay-thresh, the...

Ngày tải lên: 21/06/2014, 02:20

... collect the pieces to obtain the main result of this paper: the scaling of the RDP limited throughput of a random ad hoc network. The next theorem covers the case where the RDP plays the role of the ... analyti- cal means. The subject of this paper is the effect of the route dis- covery process (RDP) on the throughput capacity of ad hoc networks. Previous results for the network capacity and throughput, ... ex- pected value of V i will be equal to half of the expected value of the number of nodes in the vertical strip formed by the “ column” of cells above and below the cell C i .Theareaof this strip...

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 22/06/2014, 19:20

... networks (WLANs). Although often used in practical implementations of mobile ad hoc networks, IEEE 802.11 presents several drawbacks in the context of ad hoc networks, one of them being its poor throughput ... quantitatively estimated the degradation of the network throughput due to fading. Figure 1 shows the degradation of network throughput versus the probability of the channel being “bad” for different ... pair [2], independent of the number of nodes. However, the performance of ad hoc networks with MAC protocols such as IEEE 802.11 falls short of what is predicted by these theoretical models. This...

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 22/06/2014, 22:20

... binding of the polyadenylated rpsO RNA. We have shown that the presence of the remainder of the acidic tail results in the thermodynamic stabilization of Hfq by 1.8 kcalặmol )1 . A comparison of the ... destabilize the network of hydrogen bonds. The crystal structure of the first 71 amino acids of E. coli Hfq indicates that the C-terminal domain is probably located at the top of the ring, because the ... another. The difference between the Hfqs results from the insertion of a fragment of variable length between the first 67 amino acids and the end of the acidic C-terminal domain. Determining the...

Ngày tải lên: 19/02/2014, 12:20

... above. Determination of the half-life (T1/2) of CPU’s activity The T1 ⁄ 2 of the activity of the best mutants secreted in the supernatant of the cells in both screens was then determined as follows: Activated ... interact favourably with the hydrophobic clus- ter made up of I316, F318, A337 and V341. Another contribution to the low stability of the WT proCPU is the close spatial proximity of the three His residues ... concentration of the inhibitor, A is locked to 0%, B to 100%, C is the IC 50 value and D is the slope of the curve. The IC 50 value is the concentration x, where y ẳ 50%. K m was measured using the HPLC...

Ngày tải lên: 07/03/2014, 12:20

... (Fig. 6), and support the long half-life of the enzyme. The inability to detect IFG in the brain of L444P GCase mice is most prob- ably a result of the dose of IFG tartrate administered (20 mgặkg )1 ặday )1 ) ... and measurement of tissue enzyme activity Mice were administered either IFG HCl or IFG tartrate in drinking water (ad libitum). The dosing solutions were prepared on the basis of the daily water ... Journal compilation ê 2010 FEBS ages further evaluation of this molecule for the treat- ment of neuronopathic forms of Gaucher disease. The administration of IFG to L444P GCase mice for up to 24...

Ngày tải lên: 22/03/2014, 21:20

... improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading ... devoted for studying the effects of the mobility of the wireless ad hoc network device (V c ) on the transmitted packets and the received audio signals. In this computer simulation, the v is 1 up ... show the variation of the Cr and the MSE of the received audio signals with the channel SNR, respectively. These figures reveal that the proposed chaotic interleaver improves the quality of the...

Ngày tải lên: 20/06/2014, 20:20

... branches of an MRC system increases the variance as well as the LCR of the channel capacity, while the ADF of the channel capacity decreases. On the other hand, for the case of EGC, an increase in the ... correlation decreases the mean channel capacity, whereas the ADF of the channel capacity increases. Moreover, an increase in the spatial correlation increases the LCR of the channel capacity at only ... decreases the mean channel capacity, while the ADF of the instantaneous channel capacity increases. The presented results are very helpful to optimize the design of the receiver of wireless communication...

Ngày tải lên: 20/06/2014, 22:20

... effects on the audio transmission performance This section is devoted for studying the effects of the mobility of the wireless ad hoc network device (V c ) on the transmitted packets and the received ... 16 gives the throughput variation with the different velocity of the mobility. So, these results indicate the mobility effects on the different metric of the perfromance evaluation. The previous ... improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction. Keywords: wireless networks; Bluetooth; fading...

Ngày tải lên: 21/06/2014, 20:20

... same frequency band are shown by the lines with the same type. The capacity is given by the following theorem. Theorem 4 (see [5, Theorem]). The capacity of the relay channel with orthogonal ... part of the message is directly decoded by the sink, while the other parts are decoded by the next relay. In the next blocks, the sender and the relays cooperate with each other to remove the ... such that the relay decodes part of the message transmitted in the previous block and cooperates with the sender to transmit the decoded part of the message to the sink in current block. The following...

Ngày tải lên: 21/06/2014, 22:20

... requirements of the scheduler in 4G networks into the original scheme. In such networks, the utilization of the resources and hence the performance of the network can be enhanced by making use of the ... the CDF plot of the normalized throughput given by (7) for 20 UTs per sector with an AF of 0.7. By normalizing the throughput, the performance of the cell edge users represented by the tail of ... Based on these parameters, the second-level scheduler assigns resources to the selected users in an adaptive manner that exploits the frequency selectivity of the OFDMA air inter- face. The modified...

Ngày tải lên: 21/06/2014, 23:20

... City, Nagano). The wireless networks made up of these wireless LAN units are shown in Figure 5. The wireless LAN in 2.4 GHz band should be operated in line of sight. The area between the main drill ... video images of victims being sent over the wireless LAN network from the devastated areas, administer aid to patients. In the case of Japan, paramedics are limited to the degree that they can treat ... successfully in the main drill site area. These systems consisted of IEEE802.11b wireless LAN units we had already developed. The networks that we established and successfully oper- ated consisted of only...

Ngày tải lên: 22/06/2014, 06:20

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 09/08/2014, 01:23

Ngày tải lên: 09/08/2014, 14:20