FOUNDATION OF COGNITIVE RADIO SYSTEMS ppt

... spectrum access systems. Samuel Cheng, Ph.D. Assistant Professor, School of Electrical and Computer Engineering, University of Oklahoma, Tulsa USA FOUNDATION OF COGNITIVE RADIO SYSTEMS ... processing times and for some combinations of NFFT and M, real time elaboration is not possible. 38 Foundation of Cognitive Radio Systems A Practical Demonstration of...

Ngày tải lên: 28/06/2014, 17:20

... two parts. 44 Advances in Cognitive Radio Systems Advances in Cognitive Radio Systems 32 2.8 Underlay Control Messaging (UCM) This approach is the equivalent of transmitting control signals ... Controlled Oscillator for Cognitive Radio, Proceedings of the 2010 IEEE International Microwave Workshop Series (IMWS) on RF Front-ends for Software Defined and Cognitive R...

Ngày tải lên: 07/03/2014, 21:20

... P. Wang, L. Xiao, S. Zhou, and J. Wang, “Optimization of detection time for channel efficiency in cognitive radio systems, ” in Proceedings of Wireless Communications and Networking Conference (WCNC ... and that of TFOSA approach decrease almost linearly with the increase of the probability of sensing errors. In plot (b), both collision probability of optimal OSA approach and t...

Ngày tải lên: 21/06/2014, 19:20

... Channels c 1 c 2 c 3 c 4 c m c 4 c 1 c 2 c 3 c 4 c m c 3 c 1 c 2 c 3 c 4 c m c 4 c 1 c 2 c 3 c 4 c m c 2 t 1 t 2 t 3 t 4 time frequency c 1 c 2 c 3 c 4 c m c 3 t 5 c 1 c 2 c 3 c 4 c m c 3 t 6 t 1 t 2 t 3 t 4 t 5 t 6 c 1 c 2 c 3 channels time c 4 . . . c m . . . . . . . . . Fig. 11. Common Hoping ADVANCES IN COGNITIVE RADIO SYSTEMS Edited by Cheng-Xiang Wang and Joseph Mitola III...

Ngày tải lên: 27/06/2014, 00:20

... force-termi- nation probability of SU P FT-su , mean system delay of SU T Delay-su , mean waiting time of PU t wait-pu ,and blocking probability of PU P BL-pu . The expressions of these metrics are described ... number of channels N.Allofthe simulation results show that t he NP mechanism signifi- cantly improves the QoS of SUs with an acceptable QoS degradation of PUs. The per...

Ngày tải lên: 20/06/2014, 22:20

... delay (msec), T limit 100 Number of subcarriers 2048 Bandwidth of CR system (MHz) 6 Center frequency of CR system (MHz) 500 Bandwidth of PU (MHz) 6 Center frequency of PU (MHz) 500 Figure 3, it is ... Period for Cognitive Radio Systems: A Pilot Cancellation Approach Dong Geun Jeong, 1 Sang Soo Jeong, 2 and Wha Sook Jeon 2 1 Department of Electronics Engineering, Hankuk Univer...

Ngày tải lên: 21/06/2014, 05:20

... t  P  { X τ } τ∈O n ,τ≤t  =  t s=0   s−1 r=0,r∈O n p 0n ( X r )  t r=s,r∈O n p 1n ( X r ) p e ( s )   ∞ s=0   s−1 r =0,r∈O n p 0n ( X r )  t r =s,r∈O n p 1n ( X r ) p e ( s )  . (C.4) This concludes the proof. D. Proof of Equations (13) and (14) Proof. We first show (13). From the proof of Proposition 2, we know b n t  X t 0  = P  { X τ } τ∈O n ,τ≤t , ... reducing the numbe...

Ngày tải lên: 21/06/2014, 20:20

... U.S. FCC support of cognitive radio complements COGNITIVE RADIO AND PUBLIC POLICY 15 available, a pro-KTH behavior. This hard-coded behavior implemented the value system of fl ow 4 of Figure 2-1, ... market forces. 1.5 COGNITIVE RADIO AND PUBLIC POLICY Ideal cognitive radios are aware, adaptive radios that learn from experience. AML enables wireless devices to discover an...

Ngày tải lên: 25/01/2014, 17:20

Ngày tải lên: 27/01/2014, 08:20