Power allocation for orthogonal frequency division multiplexing-based cognitive radio systems with and without integral bit rate consideration

2011 ◽  
Vol 5 (5) ◽  
pp. 575-586 ◽  
Author(s):  
Y. Ma ◽  
Y. Xu ◽  
D. Zhang
Keyword(s):  
Cognitive Radio ◽  
Power Allocation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Bit Rate ◽  
Cognitive Radio Systems ◽  
Radio Systems

A planar UWB antenna based on MB-OFDM applications with switchable dual band-notched for cognitive radio systems

2014 ◽  
Vol 8 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Vahid Sharbati ◽  
Pejman Rezaei ◽  
Ali Shahzadi ◽  
Mohammad M. Fakharian
Keyword(s):  
Cognitive Radio ◽  
Orthogonal Frequency Division Multiplexing ◽  
Simple Structure ◽  
Dual Band ◽  
Frequency Division ◽  
Uwb Antenna ◽  
Compact Size ◽  
Cognitive Radio Systems ◽  
Radio Systems ◽  
Left And Right

In this paper, a switchable antenna with capability to operate in ultrawideband (UWB) frequency from 3 to 10.7 GHz with two switchable notch bands of 3.3–3.7 and 3.7–4.2 GHz, is presented for cognitive radio (CR) and multiband orthogonal frequency-division multiplexing (MB-OFDM) applications. The proposed antenna has a simple structure and compact size of 17 × 24 mm2. The antenna in the UWB characteristics is obtained using a circular radiator patch with an embedded T-slot on the patch and a rectangular parasitic element that is attached to the patch. The reconfigurability is also achieved by two L-shaped parasitic elements placed in the left and right of the patch that two ideal switches is inserted over the these elements and the circular patch. The function of the antenna can be changed by tuning status of the switches that make the notch bands in application frequencies. The measurement and simulation results show that the antenna has good characteristics for CR application and MB-OFDM, where the UWB antenna is required for spectrum sensing and the switchable band rejection antenna is used for reconfigurable operation.

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