Báo cáo hóa học: " Computationally Efficient Blind Code Synchronization for Asynchronous DS-CDMA Systems with Adaptive " ppt

... 2005:5, 683–697 c  2005 Hindawi Publishing Corporation Computationally Efficient Blind Code Synchronization for Asynchronous DS-CDMA Systems with Adaptive Antenna Arrays Chia-Chang Hu Department of ... the Computationally Efficient Blind Code Synchronization 685 2. ASYNCHRONOUS DS-CDMA SIGNAL MODEL In DS-CDMA systems, all users transmit simultaneously in the...

Ngày tải lên: 23/06/2014, 01:20

... thesis, Stanford Univer- sity, Stanford, Calif, USA, November 1981. [3] J. Li, B. Halder, P. Stoica, and M. Viberg, Computationally efficient angle estimation for signals with known waveforms,” IEEE ... was with the National Key Laboratory for Radar Signal Processing, Xidian Univer- sity, where he worked on signal processing, adaptive filtering, and their applications in wireless comm...

Ngày tải lên: 22/06/2014, 23:20

... primarily for the discriminative task of modeling y given the input. Adding unigram, bigram, and trigram features to f for M-estimation resulted in a very small de- crease in performance: selecting for ... symbol S ∈ N, terminal alphabet Σ, and rules of the form A → B C and A → x. (We assume Chomsky nor- mal form for clarity; the generalization is straight- forward.) Let r A (B C) and...

Ngày tải lên: 20/02/2014, 12:20

... been used for the incorporation of Er 3? where (1) Er 3? is ligated with bis-(perfluoromethylsulfo- nyl)-aminate (PMS) forming Er(PMS) x -SBA-15 and (2) Yb 3? is codoped with Er 3? forming Yb-Er-SBA-15. ... photoluminescence of Er 3? ions in which (1) Er 3? is ligated with PMS forming Er(PMS) x -SBA-15 and (2) Yb 3? is codoped forming Yb-Er-SBA-15. The highly efficient near-IR emissio...

Ngày tải lên: 21/06/2014, 08:20

... per bit of information transmitted is analyzed. The authors claim in [6] that single-input single-output (SISO) (1 × 1) systems gives best performance over MIMO (2 × 2) systems for short-range ... in the previous paragraph. For each channel, 10 Monte Carlo simulations were per formed. We have given the uncoded BER results in Figure 5 and we see acceptable performance of the proposed s...

Ngày tải lên: 22/06/2014, 22:20

... transmis- sion time for each TRFR message comply with a uniform dis- tribution, and carrier sensing is done before sending. Since hidden problem is accessible for our system, the performance will be ... duration super-time-slot duration for node i super-time-slot starts defer time Source address for ith super-time-slot Destination address for ith super-time-slot Figure 11: Schedul...

Ngày tải lên: 22/06/2014, 22:20

... be determined: within [4, 18] range for omni-directional antennas, and within [7, 15] range for the switched beam scenario. The higher SIR threshold region obtained for the beamforming case is ... that the AODV protocol can also be modified to enforce an SIR target for the acknowledgment of the HELLO packets, with similar performance results, but with the addi- tional overhead and...

Ngày tải lên: 22/06/2014, 22:20

... BER performance over fading channel with 2 Doppler states: k 1 with f m T s = 1 × 10 −4 and k 2 with f m T s = 9 × 10 −4 ;the state probabilities are p(k 1 ) = 0.8andp(k 2 ) = 0.2. performance ... resources for improving the spectral efficiency, while maintaining good QoS, for burst-by-burst communication systems. In these systems, data are transmit- ted in bursts or blocks, possibl...

Ngày tải lên: 22/06/2014, 23:20

... MIMO equalizers for multitone systems without guard time,” Annals of Telecommunications, vol. 52, no. 1-2, pp. 21–30, 1997. [12] Y. Sun and L. Tong, “Channel equalization for wireless OFDM systems with ... SFBC-OFDM without a cyclic prefix. For this example, the performance of the ISFBC-OFDM system approaches that of the SFBC- OFDM with a cyclic prefix within just one to two itera...

Ngày tải lên: 23/06/2014, 01:20

... pooled together with the other subjects with stroke for analysis. Any subject with orthopaedic or another neurological condition that could interfere with locomotion was excluded. All subjects signed an informed ... Each test trial was paired with a control trial performed at comfortable speed with matching OF. For each of the test trials, subjects were instructed to walk the...

Ngày tải lên: 19/06/2014, 10:20