báo cáo hóa học: " Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink system" pdf

... Access Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink system Kunitaka Matsumura * and Tomoaki Ohtsuki Abstract Simultaneous transmission to multiple users using ... 3879–3891 (2007) doi:10.1186/1687-1499-2011-41 Cite this article as: Matsumura and Ohtsuki: Orthogonal beamforming using Gram-Schmidt orthogonalization for...

Ngày tải lên: 21/06/2014, 02:20

... broadcast scheduling using zero-forcing beamforming. IEEE J Sel Areas Commun. 24(3), 528–541 (2006) 8. G Dimić, ND Sidiropoulos, On downlink beamforming with greedy user selection: performance analysis ... kbits/s for VoIP traffic, R VS = 384 kbits/s for video streaming traffic and R BE = 256 kbits/s for BE traffic. The target BER values are BER RT_max =10 -3 for RT traffic and...

Ngày tải lên: 21/06/2014, 02:20

... distributed freely for any purposes (see copyright notice below). For information about publishing your research in EURASIP WCN go to http://jwcn.eurasipjournals.com/authors/instructions/ For information ... coefficients are close to 0. This is an interesting property for CDMA com- munications, for instance for multipath detection and estimation, but also for using such codes i...

Ngày tải lên: 20/06/2014, 22:20

... problem is precisely formulated, in the rest of this section we envisage to recall some design and perfor- mance issues related to vector quantization for noisy chan- nels. However, before we start ... presented a paper using minimax criterion based on hypercube that improves the worst case performance, im- portant for the image perception. Knagenhjelm and Agrell employed the Hadamard t...

Ngày tải lên: 22/06/2014, 23:20

... is true, for example, if G is an orthogonal matrix and the spreading codes are orthogonal. As in the downlink the receiver is only interested in the kth user, symbol detection is performed as ˆ s k (2i ... As expected, the receiver performs worst for Correlated channels due to smaller coding gain that the systems exhibit for this type of channels (see Appendix). 5.4 Performance f...

Ngày tải lên: 21/06/2014, 00:20

... Applications exists for each x, y ∈ U and in this case X is said to have a uniformly Frechet differentiable norm if the limit 1.2 is attained uniformly for x, y ∈ U and in this case X is said to be uniformly smooth.Wedefineafunctionρ ... convergence theorem of algorithm 1.18 for solving problem 1.17. Theorem 3.4. Let C be a nonempty closed convex subset of a uniformly convex and 2-u...

Ngày tải lên: 21/06/2014, 07:20

... Set  p [0] k = 0forallk. (2) Set t = t +1,foreachMSk (a) Calculate {w k,π k (1) , w k,π k (2) , , w k,π k (|π k |) } for all possible MBS sets π k by using (11). (b) Given the beamforming vectors for each ... is the minimum power vector that is optimized over MBS and beamforming space to meet the SINR target. The optimal receive beamforming matrix for multiuser joint power cont...

Ngày tải lên: 21/06/2014, 07:20

... multiantenna downlink in a single-cell wireless system is considered, which, from the viewpoint of information theory, corresponds to a MIMO broadcast channel (MIMO BC) [3, 6]. While the aforemen- tioned ... 1640–1646, 2006. [20] R. B ¨ ohnke and K D. Kammeyer, “Weighted sum rate maxi- mization for the MIMO- downlink using a projected conjugate 2 EURASIP Journal on Advances in Sig...

Ngày tải lên: 21/06/2014, 22:20

... continuous functions for α ≤ t ≤ β.Supposethatφ ∈ C 1 (J,J) is nondecreasing with φ( t) ≤ t on J, g(u) is a nondecreasing continuous function for u ∈ R + with g(u) > 0 for u>0,andϕ ∈ C(R + ,R + ) ... continuous functions for α ≤ t ≤ β.Supposethatφ ∈ C 1 (J,J) is nondec reasing with φ(t) ≤ t on J, g(u) is a non- decreasing continuous function for u ∈ R + with g(u) > 0 for...

Ngày tải lên: 21/06/2014, 22:20

... com- prises only two parts: extrinsic information and a priori information. The extrinsic information of STTC will be sent to the VLEC decoder as a priori information. The bit-indexed soft input ... s)  β k (s) . (13) Therefore, once the VLEC log-likelihood ratio is calculated, the extrinsic information L e VLEC will be extracted and sent to the STTC decoding as the new a priori information....

Ngày tải lên: 21/06/2014, 23:20