Báo cáo hóa học: "Research Article Feedback Reduction in Uplink MIMO OFDM Systems by Chunk Optimization" doc

... optimization of the MIMO OFDM MAC under individual power constraints and under chunk constraints. In order to reduce the feedback overhead by informing the mobiles of their linear precoding matrices, ... suboptimal. Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008, Article ID 597072, 14 pages doi:10.1155/2008/597072 Research Article...

Ngày tải lên: 22/06/2014, 06:20

... pages doi:10.1155/2008/597072 Research Article Feedback Reduction in Uplink MIMO OFDM Systems by Chunk Optimization Eduard Jorswieck, 1 Aydin Sezgin, 2 Bj ¨ orn Ottersten, 1 and Arogyaswami Paulraj 2 1 ACCESS Linnaeus Center, ... optimization of the MIMO OFDM MAC under individual power constraints and under chunk constraints. In order to reduce the feedback overh...

Ngày tải lên: 22/06/2014, 19:20

... Lozano, and R. Valenzuela, “Network MIMO: overcoming intercell interference in indoor wireless systems, ” in Proceedings of the 41th Asilomar Conference on Signals, Systems and Computers, pp. 83–87, ... approximation in (20), we consider a hexagonal cellular layout with cell sectoring. By using 120-degree sectoring in each cell, every 3 neighboring cells can coordinate with each...

Ngày tải lên: 21/06/2014, 09:20

... protocol. In the latter case, in fact, splitting sensors in clusters noninterfering among them, leads to decreasing the collision probability and, therefore, the error probability on the decision. Finally, the ... C. Lin, H. Wen, and H. Yin, “An analytical model for evaluating IEEE 802.15.4 CSMA/CA protocol in low rate wireless application,” in Proceedings of the International Con-...

Ngày tải lên: 21/06/2014, 11:20

... pages doi:10.1155/2008/125735 Research Article Interference Mitigation in Cooperative SFBC -OFDM D. Sreedhar and A. Chockalingam Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore 560012, India Correspondence ... however, are crucial in achieving the promised potential of CO-ST -OFDM [8– 11]. For example, in the context of cooperative OFDM,...

Ngày tải lên: 22/06/2014, 01:20

... 2 M  p t−1 k + 2 M    r 2t k   2 +   r 2t+1 k   2  (27) with initial value  p 0 k = 1. The metrics in (22) related with coordinate interleaved STB symbols are not suitable for Viterbi decoding. Substitut- ing (23 )in( 22) and using (11), the metrics in ... coordinate inter- leaving to MIMO- OFDM which shows that this technique provides considerable diversity gain without si...

Ngày tải lên: 22/06/2014, 06:20

... The performance 1 Coding is not considered in this paper. It has been shown that coded bit loading OFDM systems also greatly outperform coded OFDM systems in point-to-point networks [17]. Here, ... original work is properly cited. 1. INTRODUCTION In cooperative systems, a group of single-antenna nodes transmits as a “virtual antenna array,” obtaining diver- sity gain without re...

Ngày tải lên: 22/06/2014, 19:20

... coordinate inter- leaving to MIMO- OFDM which shows that this technique provides considerable diversity gain without significant in- crease of encoding and decoding complexities was proposed by Rao ... 2 M  p t−1 k + 2 M    r 2t k   2 +   r 2t+1 k   2  (27) with initial value  p 0 k = 1. The metrics in (22) related with coordinate interleaved STB symbols are not suitable f...

Ngày tải lên: 22/06/2014, 19:20

... selective channel into a 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 ... (dB) FB, no PA Windowed OFDM no PA FB, IBO = 1.2dB FB, IBO = 7.2dB FB, IBO = 13.2dB FB, IBO = 19.2dB Windowed OFDM, IB O = 0dB Windowed OFDM, IB O = 6dB Windowed OFDM, IB O = 12 d...

Ngày tải lên: 22/06/2014, 23:20

... Layzer’s feedback AM instrument is shown in Figure 1. This instrument is now investigated in detail by interpreting it as a periodically linear time-variant filter. The basic FBAM equation with feedback ... 4: Nonlinear Waveshaping. An interesting modification of the FBAM algorithm can be implemented by employing a nonlinear mapping of the feedback path, a process commonly known a...

Ngày tải lên: 21/06/2014, 07:20