Báo cáo hóa học: "Research Article A Real Orthogonal Space-Time Coded UWB Scheme for Wireless Secure Communications" pptx

... be real. In the following, weproposeaclassofrealorthogonalgroupcodesforUWB signals based on Hadamard transform and rotation matrices, which also admit more general transmit antenna settings. For n = ... coding and UWB. Compared with general approaches in [7], USTC- UWB employs real space-time codes suitable for UWB signals and can work at any transmission rate. Based on the perf...

Ngày tải lên: 21/06/2014, 22:20

... invalid path will realize the invalid path when it receives the data packet and tries to forward it according to the path found in its header. The data packet is treated like any data packet that cannot ... that cannot be forwarded at a node due to an invalid path in its header. The node carries out a route discover y operation, as described earlier, to find an alternative path for the d...

Ngày tải lên: 21/06/2014, 17:20

... enqueued at the end. 3.3. Memory management An amount of stack and data memory, containing thread- related information such as a local file table and informa- tion needed for thread management and ... decremented. The map transfer task is a real- time aperiodic task scheduled when a request for a map arrives. The array containing the map is then compressed with a simple (value,...

Ngày tải lên: 21/06/2014, 22:20

... sensor architecture for the locally raster-scanning raw image sensor. the calculations are formulated as (4). Ta b l e 2 shows that the average variation of red signal is 0.09, the average variance ... and 9 means that the diagnosis is not a ected. According to the evaluation results of Figure 14, all decoded GI images are suitable for practical diagnosis because of high evaluation score...

Ngày tải lên: 21/06/2014, 07:20

... and load-based TCS schemes [21], and a simple hard QoS-based call admission control scheme which blocks a new call into a cell when there is no available bandwidth. The bandwidth allocation and ... common value for the wireless links and V is the zero-mean standard Gaussian random variable w ith the variance of 1 [19]. Figure 4 shows the average handover failure rate (AHFR) with t...

Ngày tải lên: 21/06/2014, 17:20

... relevant channel state information is instantaneously and perfectly available at each AP and user. Also, ideal Shannon-rate coding has been assumed, that is, the impact of real- world coding and ... usually by numerical simulation, with more realistic models for signal propagation and cochannel interference (accounting, at least, for distance-based power loss and shadow fading effects)....

Ngày tải lên: 21/06/2014, 19:20

... S. Hara, D. Zhao, K. Yanagihara, et al., “Propagation charac- teristics of IEEE 802.15.4 radio signal and their application for location estimation,” in Proceedings of the 61th IEEE Vehicular ... IEEE Vehicular Technology Conference (VTC ’06), pp. 2499–2503, Montreal, Canada, September 2006, CD-ROM. [17] R. Zemek, S. Hara, K. Yanagihara, and K I. Kitayama, A joint estimation of target loca...

Ngày tải lên: 21/06/2014, 22:20

... for nonexpansive mappings and nonexpansive semigroups,” Journal of Mathematical Analysis and Applications, vol. 279, no. 2, pp. 372– 379, 2003. 4 W. Takahashi, Y. Takeuchi, and R. Kubota, “Strong ... hybrid methods introduced by Nakajo and Takahashi 3 for a nonexpansive mapping. Recently, Takahashi et al. 4 proposed a shrinking projection method for nonexpan- sive mappings T n...

Ngày tải lên: 21/06/2014, 05:20

... The external data can be transmitted by more than one pathway to guarantee the success delivery to the sink node. For example, the gateway node A can send data to O by different pathways: A → C → ... International Symposium on Wireless Personal Multimedia Communications, pp. 892–898, Aalborg, Denmark, 2001. [6] B. Deb, S. Bhatnagar, and B. Nath, “ReinforM: reliable infor- mation forwar...

Ngày tải lên: 21/06/2014, 17:20

... adversary can capture any number of auxiliary nodes or ordinary nodes arbitrarily. So they have higher probability of compromising a fraction of auxiliary nodes and ordinary nodes in a special ... however, are not always available in typical WSNs. Traynor et al. [18] proposed an unbalanced random key predistribution scheme for Heterogeneous WSNs, where there are a large number of th...

Ngày tải lên: 21/06/2014, 17:20