ADVANCES IN COGNITIVE RADIO SYSTEMS potx

... conditions used in (Steenstrup, 2005). In (Lazos et al, 2009), the authors considered the control plane and used the clustering approach for finding Advances in Cognitive Radio Systems 32 2.8 ... beginning of the drain line a matched termination section (indicated as a resistor), having the same impedance of the ATL is introduced with the purpose of absorbing the forward...

Ngày tải lên: 28/06/2014, 22:20

... divided into 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 ... Restricted tuning capabilities can be incorporated in this circuit introducing a varactor diode in the feedback line in order to control its electrical length chang...

Ngày tải lên: 07/03/2014, 21:20

... using FETs and Artificial Transmission Lines. Advances in Cognitive Radio Systems 40 The control messaging must hop in t = t 4 from c 8 to another channel. However, in this process, in ... divided into two parts. 44 Advances in Cognitive Radio Systems Control Plane for Spectrum Access and Mobility in Cognitive Radio Networks with Heterogeneous Frequency...

Ngày tải lên: 26/06/2014, 23:20

... Common Hoping ADVANCES IN COGNITIVE RADIO SYSTEMS Edited by Cheng-Xiang Wang and Joseph Mitola III Advances in Cognitive Radio Systems 6 Fig. 2. An ideal DVCO, with a tuning element ... divided into two parts. 44 Advances in Cognitive Radio Systems Control Plane for Spectrum Access and Mobility in Cognitive Radio Networks with Heterogeneous...

Ngày tải lên: 27/06/2014, 00:20

... sensing time increases with increasing the repo rting delay and decreases with increasing the instan- taneous detection SNR. Figure 5 shows the maximum aver age throughput versus the reporting ... spectrum sensing, cognitive radio, reporting delay, optimization, sensing user selection 1 Introduction Cognitive radio (CR) technology has recently been iden- tified as a promising way to ad...

Ngày tải lên: 20/06/2014, 21:20

... MIMO systems can be broadly categorized into MIMO broadcast channels and MIMO multiple access channels for downlink and uplink situations, respectively. The achievable gains of multiuser MIMO in ... multiuser MIMO uplink, and the fourth paper by Salim et al. compares various user selection algorithms for achieving SINR targets with average minimum trans- mit power in multiuser MIMO sys...

Ngày tải lên: 20/06/2014, 22:20

... spectrum opportunities with MAC-layer sensing in cognitive radio networks,” IEEE Transactions on Mobile Computing, vol. 7, no. 5, pp. 533–545, 2008. [17] S. Haykin, Cognitive radio: brain-empowered wireless com- munications,” ... Constraint in Cognitive Radio Systems Qinghai Xiao, 1, 2 Yunzhou Li, 1 Xiaofeng Zhong, 1 Xibin Xu, 1 and Jing Wang 1 1 State Key Laboratory on Microw...

Ngày tải lên: 21/06/2014, 19:20

... to hard-decision reporting case. Finally, current security issues in cognitive radio networks, including attacks and corresponding defense schemes, are concluded in [25]. In this paper, we develop ... on Advances in Signal Processing individually [13–15]. Optimized cooperative sensing is stud- ied in [16, 17]. When the channel that forwards sensing observations experiences fad...

Ngày tải lên: 21/06/2014, 19:20

... 9 In conclusion, some indications can be given. Prefrontal cortex regions are involved in short- term memory and object discrimination. Cholinergic signaling, coming from basal forebrain to ... changes in the architecture of EEG is also generated, such a significant increase in EEG theta power. Another interesting finding, coming from such an approach, was that selective cholinerg...

Ngày tải lên: 27/06/2014, 00:20

... for multiuser OFDM cognitive radio systems, ” in Proceedings of the 2nd International Conference on Communications and Networking in China (ChinaCom ’07), pp. 115–119, Shanghai, China, August 2007. [16] ... Maguire Jr., Cognitive radio: making software radios more personal,” IEEE Personal Communica- tions, vol. 6, no. 4, pp. 13–18, 1999. [3] J. Mitola, Cognitive Radio Architect...

Ngày tải lên: 21/06/2014, 11:20