Báo cáo hóa học: " Research Article Channel Asymmetry in Cellular OFDMA-TDD Networks" docx

... γ 2 ≥···≥γ N c . In other words, while maintaining a given sum rate, minimum total power is used if the subcarriers are ordered according to their link gains (best link gain first) and the SINR targets ... UL/DL asymmetry interference aspects in multicellular multiuser OFDMA-TDD systems consid- ering both LOS and NLOS conditions among BSs, when jointly applying channel allocation and...

Ngày tải lên: 22/06/2014, 00:20

... compute p(y | u) by marginalizing out the channel g using the channel fading statistics: p(y | u) =  g p(y | u, g)p(g)dg. (21) With this marginalization, we can use the channel aware de- sign ... “averaged” transmission channel. The difference between this alternative approach and that of minimizing (7) is in the way that the channel fading statistics, p(g), is utilized. In using...

Ngày tải lên: 22/06/2014, 22:20

... (TUT), Finland, in 2005. Currently, he is a Researcher and aPostgraduatestudentattheInstituteof Communications Engineering at TUT, pur- suing towards the doctoral degree. His main research interests ... set of paral- lel fl at-fading subchannels. This is achieved using the inverse fast Fourier transform (IFFT) processing and by inserting a time domain guard interval, in the form of a cyc...

Ngày tải lên: 22/06/2014, 23:20

... 10. In Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011, Article ID 650619, 7 pages doi:10.1155/2011/650619 Research Ar ticle Channel Sensing ... (see Figure 2). In many existing (non-CR) systems, “frame” is the time unit corresponding to the source and/or channel coding block. Thus, the channel measurement reporting for chann...

Ngày tải lên: 21/06/2014, 05:20

... to those in Figure 4. Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010, Article ID 189157, 8 pages doi:10.1155/2010/189157 Research Article Resource ... T. Qin and C. Leung, “Fair adaptive resource allocation for multiuser OFDM cognitive radio systems,” in Proceedings of the 2nd International Conference on Communications and Networ...

Ngày tải lên: 21/06/2014, 11:20

... Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010, Article ID 314397, 11 pages doi:10.1155/2010/314397 Research Article Channel Resource ... existing EDCA modelling schemes are based on the Bianchi’s work [27], which introduces using the Markov chain to model DCF. In our previous work [25], we have developed a sim- plified Markov cha...

Ngày tải lên: 21/06/2014, 11:20

... Communications and Networking 5 0 5 10 15 20 25 30 10 0 10 −1 10 −2 10 −3 10 −4 10 −5 SNR (dB) MSE Randon training Orthogonal training Orthogonal optimal training Zadoff-Chu optimal training Figure 1: MSE ... 25 30 10 0 10 −1 10 −2 10 −3 SNR (dB) SER Exact channel Randon training Orthogonal training Orthogonal optimal training Zadoff-Chu optimal training 14.5 15 15.5 10 −1.3 10 −1.2 Figure 2:...

Ngày tải lên: 21/06/2014, 17:20

... Ohgane, and Y. Ogawa, “Compensation of channel information error using first order extrapolation in eigenbeam space division multiplexing (E- SDM),” in Proceedings of International Conference on Wireless Communications ... model were calculated by applying the 450-point DFT process to the time domain channel autocorrelation after multiplying it by the Hamming window. It can be seen tha...

Ngày tải lên: 21/06/2014, 18:20

... can be maintained in a single-hop network. IEEE 802.11 also maintains fairness which is preserved in a single hop network. 5.1.2. Channel Prediction Inaccuracy. As we discussed earlier, Channel ... forwarding in a chain network. This problem is reduced in Channel MAC due to the channel diversity as shown in both the single chain and multiple chain 12 EURASIP Journal on Advan...

Ngày tải lên: 21/06/2014, 22:20

... found using the duality of the MAC/BC and iterative water-filling [1]. 3.2. Linear transmit precoding Linear transmit precoding, or beamforming, is a technique that uses linear preprocessing to ... slowly varying subspaces in the time-varying multiuser MIMO channel. 2. SYSTEM AND CHANNEL MODELS The MIMO broadcast channel communication scenario of interest consists of a single transmitt...

Ngày tải lên: 22/06/2014, 00:20