Báo cáo hóa học: "Research Article DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems" pot

... Communications and Networking Volume 2009, Article ID 647130, 8 pages doi:10.1155/2009/647130 Research Article DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems Yi Wang, 1, 2 Lihua ... Networking LS channel estimation  H partial 0  H partial 1 . . .  H partial M −1 Symmetric extension  H symmetric 0  H symmetric 1  H symmetric 2M −...

Ngày tải lên: 21/06/2014, 22:20

... approach pro- posed for the general estimation from superimposed signals [6] is applied to the channel estimation for OFDM systems and compared with SAGE version in [7]. For CDMA sys- tems, Nelson ... the performance of PIC detector. Therefore, data and channel estimation performance obtained in the initial stage has a significant relationship with the performance of PIC. S...

Ngày tải lên: 22/06/2014, 19:20

... method in association with a one-step channel predictor has the most accurate prediction of the current channel for current data detection when the channel is fast fading. Therefore, the SER of the ... predictor has the best performance with slow velocity because the channel variation is slow. However, when the mobile moves with high velocity, the proposed method with a one-...

Ngày tải lên: 21/06/2014, 08:20

... three-dimensional MIMO FEXT channel matrix H can be estimated via (17). For subchannel k, the LS estimation of the FEXT channel between transmitter m and receiver n can be expressed with (14)and(16)as  H k n,m = Y k n (m) X k m = ... instance m 0 and m, for example, it is assumed that P z (m) ≈ P z (m 0 ) for the FEXT case, and P w (m) ≈ P w (m 0 ) for the NEXT case. As befor...

Ngày tải lên: 21/06/2014, 22:20

... to generate a correct equalizer for a channel with colored input. Since the estimation of  h and the proof of (18)donotrequirewhite input, the estimation of the channel will not be affected by colored ... equalizer achieves a performance close to the trained MMSE equalizer for channels with white inputs at high SNR. The introduced Tsatsanis and Xu’s (TX’s) CMOV algorithm obtai...

Ngày tải lên: 21/06/2014, 22:20

... 1 words. We can follow the same EM procedure for parameter estimation in the n-gram-PLSA model where w i is replaced by h i in all formulae. In the re -estimation formulae, we have n(d k , h i , w j ) ... history with probability P(w i ). (2) Select a document d k with probability P(d k | w i ). (3) Pick a latent variable z l with probability P(z l | w i , d k ). (4) Generate a wor...

Ngày tải lên: 21/06/2014, 08:20

... 1 SNR  (63) for l = 0, , n − 1andp n = 1 − F γ ((2 R − 1)/SNR). For Rayleigh-fading channels, the CDF of the channel gain is given by F γ (x) = 1 − e −x . 6.2. Latency Analysis for QEDT Encoding. ... (C&E), and analyze their performance for vari- ous networks topologies. The Q&E encoding scheme is a particularization of Wyner-Ziv’s to scenarios with no side information at...

Ngày tải lên: 21/06/2014, 17:20

... be the performance objectives for analog-source transmission systems. To some extend, they are instructive for system design. 6.2. Future Work. (i)AswehaveshowninFigures5 and 6(b), for a system ... antennas, and T is the number of channel uses for transmitting one block. The corresponding source -channel decoder is a mapping C N r ×T → R K that maps the channel output Y ={y 1 , ,...

Ngày tải lên: 21/06/2014, 18:20

... experiments are performed assuming various environments and deployment scenarios to examine the performance of femtocell networks. The results are compared with Monte Carlo simulations for verification ... important performance measures in cellular systems. Its probability distribution plays an important role for system performance evaluation, radio resource management, and radio network...

Ngày tải lên: 21/06/2014, 18:20

... information) then we can uniquely invert u A to obtain x, and reproject x to obtain u B . We formulate a discrete time dynamical system for location tracking on the plane. The state space for ... scenario interacts with the geometry database, which contains models and animations for all of the activities supported by the system. The position data specifies a location, for each frame,...

Ngày tải lên: 21/06/2014, 20:20