Báo cáo hóa học: "Research Article Downlink Assisted Uplink Zero Forcing for TDD Multiuser MIMO Systems" docx

... Communications and Networking Volume 2009, Article ID 894726, 11 pages doi:10.1155/2009/894726 Research Article Downlink Assisted Uplink Zero Forcing for TDD Multiuser MIMO Systems Petri Komulainen, Antti ... transmit- receive zero forcing schemes for the uplink of cellular multiuser MIMO systems in the TDD mode. Beam selec- tion is an integral part of the...

Ngày tải lên: 21/06/2014, 22:20

... <l. 2.4. Coordination Transformation Lemma 2.6. There exists a transformation of the form t  t, λ  r  S  r, θ  , 2.43 such that the system 2.41 is changed into the form dλ dθ  g 1  t, ...  1σ 0 . The estimates 2.74 for k  s ≥ 1 follow easily from 2.60. 2.5. Poincar´e Map and Twist Theorems for Reversible Mapping We can use a small twist theorem for reversible mappi...

Ngày tải lên: 21/06/2014, 07:20

... p   . 3.4 So p ∈ C n for all n ∈ N.ThusΩ ⊂ C n . Next we will show by induction that Ω ⊂ Q n for all n ∈ N. For n  1, we have Ω ⊂ C  Q 1 . Assume that Ω ⊂ Q n for some n ≥ 1. Since x n1  ... P Ω x 1 . Proof. Denote Θ k n  T F k r k,n ···T F 2 r 2,n T F 1 r 1,n for every k ∈{1, 2, ,M} and Θ 0 n  I for all n ∈ N. Therefore u n Θ M n x n . The proof is divided into six ste...

Ngày tải lên: 21/06/2014, 07:20

... [19]consideredanimperfect channel state information and adaptive pilot symbol -assisted modulation in cross-layer combining of ARQ and AMC for unicast links, making the performance analysis more practical. In ... layers for a multicast service, such a PER constraint becomes a residual PER constraint after retransmissions in a system with ARQ [3]. Therefore, the instantaneous error-perfor...

Ngày tải lên: 21/06/2014, 17:20

... Advances in Signal Processing Volume 2009, Article ID 361063, 11 pages doi:10.1155/2009/361063 Research Article Secure Collision-Free Frequency Hopping for OFDMA-Based Wireless Networks Leonard ... (6) For the ith user, if N i u > 1, then the ith users information symbols are first fed into a serial-to-parallel converter. Assuming that at the nth symbol period, user i transmits the...

Ngày tải lên: 21/06/2014, 20:20

... ad- ditional information, that is, a formal model for the ar- chitecture template as well as mapping constraints for the actors of the SysteMoC application. All these information are captured in a formal ... generator for FPGA-based SoC platforms. In our following case study, we specify the system generation flow for Xilinx FPGA platforms only. Figure 8 shows the gen- eral flow for Xi...

Ngày tải lên: 22/06/2014, 19:20

... Holtzman, and Z. Zvonar, Multiuser de- tection for CDMA systems,” IEEE Personal Communications, vol. 2, no. 2, pp. 46–58, 1995. [2] S. Moshavi, Multiuser detection for DS-CDMA communi- cations,” ... approximated bound and the single-user bound. As expected, for all transmission probabilities, for large-enough number of symbols the ML performance converges to the bound. Again, we can...

Ngày tải lên: 22/06/2014, 19:20

... shot. This means that the viewers have new information to assimilate for every shot and may become dis- tracted. In general, the less periphery information shown to a viewer, the more they can ... Lehane et al. 15 textual information, possibly taken from subtitle informa- tion, which could improve retrieval efficiency, or face detec- tion, which would provide additional information about the...

Ngày tải lên: 22/06/2014, 19:20

... constellations using the proposed heterodyne archi- tecture for high-speed MPSK/QAM signals: 100 Mbps for QPSK, 200 Mbps for 8PSK and 16 QAM, and 400 Mbps for 16PSK. As seen, all clusters of demodulated ... Wireless Communications and Networking Volume 2007, Article ID 34358, 7 pages doi:10.1155/2007/34358 Research Article V-Band Multiport Heterodyne Receiver for High-Speed Comm...

Ngày tải lên: 22/06/2014, 22:20

... In such conditions, we propose the following scheme. The CP performs joint DPC, which would be optimal for the case C →∞(as for any MIMO broadcast system, see, e.g., [9]), producing the sequences ... latter enables a simple closed- form expression to be obtained for the achievable rate (6). This expression permits further insight to be gained into the performance of downlink transmi...

Ngày tải lên: 21/06/2014, 19:20