Báo cáo hóa học: " Spectrally Efficient Communication over Time-Varying Frequency-Selective Mobile Channels: Variable-Size Burst Construction and Adaptive Modulation" pot

... 10.1155/ASP/2006/35352 Spectrally Efficient Communication over Time-Varying Frequency-Selective Mobile Channels: Variable-Size Burst Construction and Adaptive Modulation Francis Minhthang Bui and Dimitrios Hatzinakos The ... SNR MMSE Variable-size burst Fixed small burst Fixed big burst Quasi-static burst Figure 6: BER performance over fading channel wit...

Ngày tải lên: 22/06/2014, 23:20

... attractive bandwidth for the amplifier applica- tion in optical communications, Yb-Er-SBA-15 has 88 nm broad ‘‘effective bandwidth’’. The high emission cross section and broad ‘‘effective bandwidth’’ ... 10 20 ions/cm 3 and 2.71 9 10 20 ions/ cm 3 , the FWHM bandwidths are 20 and 53 nm, respectively. The split of the subsidiary peak is the reason corresponding to these narrower FWHM band...

Ngày tải lên: 21/06/2014, 08:20

... modules. TheMIMOsysteminconcern,withM transmitters and N receivers, can be given as in Figure 2. We call the set of transmitters T and the set of receivers R. Their cardinalities, |T| and |R|,areM and N, respectively. The ... multiplications and additions and 1 real division. Since for fixed i, j varies from i+1to M, the number of itera- tions of j is M −i. Moreover, in order to ca...

Ngày tải lên: 22/06/2014, 22:20

... perform communication in their own super-time-slots and turn off their radios to save energy in Off-Phase and other nodes’ super-time-slots. Hence, nodes carry out communications orderly and contention ... about the construction of small and low-cost sen- sor node w ith signal processing and wireless communication capabilities. Dist ributed WSNs have increasing applications, as...

Ngày tải lên: 22/06/2014, 22:20

... source-destination pairs of nodes are randomly chosen and the traffic burst arrival is modeled as a Poisson process with parameter λ = 1 burst/ s. The burst length is 64 packets and the message packet length ... Nasipuri, J. Mandava, H. Manchala, and R. E. Hiromoto, “On-demand routing using directionl antennas in mobile ad hoc networks,” in Proceedings of IEEE Wireless Communica- t...

Ngày tải lên: 22/06/2014, 22:20

... case of small samples and/ or low SNR and provide the same estimation performance as the latter when the samples become large and/ or SNR increases. REFERENCES [1] P. Stoica and R. Moses, Introduction ... Stoica and A . Nehorai, “MUSIC, maximum likelihood, and Cramer-Rao bound,” IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 37, no. 5, pp. 720–741, 1989. [18]...

Ngày tải lên: 22/06/2014, 23:20

... filterbank scheme can be used to perform code acquisition and code track- ing in frequency-flat and frequency-selective, time-invariant, and time-varying fading channels. However, this algorithm again ... frequency- and/ or time-division multiple-access (FDMA/TDMA) systems. In a DS-CDMA communication system, all users are allowed to transmit information simultaneously and independ...

Ngày tải lên: 23/06/2014, 01:20

... growth of wire- less communications, especially in mobile communications and personal communications services (PCS). With the con- tinuing expansion in both existing and new markets and the introduction ... Signal and Image Processing and teaches courses in signal processing and telecommunications. Dr. Williams has served as an Associate Ed- itor of the IEEE Transactions on Sign...

Ngày tải lên: 23/06/2014, 01:20

... train. Generative and discriminative models have been compared and discussed a great deal (Ng and Jordan, 2002), including for NLP models (Johnson, 2001; Klein and Manning, 2002). Sutton and McCallum (2005) ... EMNLP. J. Lafferty, A. McCallum, and F. Pereira. 2001. Conditional random fields: Probabilistic models for segmenting and la- beling sequence data. In Proc. of ICML. D. C....

Ngày tải lên: 20/02/2014, 12:20

... CA- REER award #0747340 and IIS awards #0917170 and #1018613. Any opinions, findings, and conclu- sions or recommendations expressed in this material are those of the authors and do not necessarily ... best substitute, and it is given as 46.15%. The highest scoring participating system achieved 12.9%, which 107 gave a 2.95% improvement over the baseline (Yuret, 2008; McCarthy and...

Ngày tải lên: 07/03/2014, 22:20