Báo cáo hóa học: " Bandwidth Efficient OFDM Transmitter Diversity Techniques" pot

... 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 ’ ... corre- sponds to a not too wide FWHM bandwidth 45 nm (1519–1564 nm) at 5.59 9 10 -21 cm 2 , if the left subsidiary peak is taken into account, the ‘‘effective bandwidth ’ could be 88 nm...

Ngày tải lên: 21/06/2014, 08:20

... transmitters given by the set T k (⊆ T) and the receivers given by the set R k (⊆ R) and estimate the chan- nels between those transmitters and receivers. Let P k be the power level of each transmitter ... from all transmitters simultaneously, we have to transmit them in a sequential manner by activating only one transmitter at a time. In order to satisfy the delay require- ment, each tr...

Ngày tải lên: 22/06/2014, 22:20

... receiving data packets successfully. A transmission is defined as an un- successful one once the transmitter does not receive ACK af- ter a certain period of time. The format of the schedule mes- sage ... always clock-drifts caused by unstable and inaccurate frequency standards. So it is possible that transmitters have powered on their radios to send a message, but receivers’ radios are stil...

Ngày tải lên: 22/06/2014, 22:20

... second, to detect link breakages. However, HELLO messages create extra control overhead and increase bandwidth consump- tion. Furthermore, once a link breaks, changes in the links’ quality due to mobility ... self-positioning algo- rithm, for example [16]. In this paper, we employ directional antennas at the transmitter and omnidirectional antennas at the receiver. In directional mode, th...

Ngày tải lên: 22/06/2014, 22:20

... Processing Volume 2006, Article ID 19514, Pages 1–7 DOI 10.1155/ASP/2006/19514 Computationally Efficient Direc tion-of-Arrival Estimation Based on Partial A Priori Knowledge of Signal Sources Lei

Ngày tải lên: 22/06/2014, 23:20

... structure Figure 4 shows a potential variable-size burst structure. The key idea here is to realize the distinction between a transmit- ted and a received burst: regardless of what the transmitter sends, ... when the channel is changing rapidly, this latency can cause incorrect modes to be invoked by the transmitter receiving outdated metrics. Under certain conditions, it may be possible...

Ngày tải lên: 22/06/2014, 23:20

... 2003. Shallow parsing with conditional random fields. In Proc. of HLT-NAACL. A. Stolcke. 1995. An efficient probabilistic context-free pars- ing algorithm that computes prefix probabilities. Computa- tional ... 752–759, Prague, Czech Republic, June 2007. c 2007 Association for Computational Linguistics Computationally Efficient M-Estimation of Log-Linear Structure Models ∗ Noah A. Smith and...

Ngày tải lên: 20/02/2014, 12:20

... hence efficient ac- cessing of the N-gram frequencies becomes an is- sue. Trivial methods such as linear or binary search over the entire dataset in order to access a single N-gram prove inefficient, ... Texas Denton, TX 76203 rada@cs.unt.edu Abstract We introduce a new publicly available tool that implements efficient indexing and re- trieval of large N-gram datasets, such as the Web1T 5-gr...

Ngày tải lên: 07/03/2014, 22:20

... sen- tences more efficiently. 4.3 Filtering left-corner splines The left-corner parser builds left-corner splines one step at the time. For a given goal, it first se- lects a potential left-corner, ... ACL. Khalil Sima’an. 1999. Learning Efficient Disambigua- tion. Ph.D. thesis, University of Utrecht. Yoshimasa Tsuruoka, Yusuke Miyao, and Jun’ichi Tsu- jii. 2004. Towards efficient probabilist...

Ngày tải lên: 24/03/2014, 03:20

Ngày tải lên: 31/03/2014, 01:20