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In this paper, a hybrid time-division duplex access scheme with confidence factor based weighted cooperative sensing for the femtocells has been proposed in cognitive massive multiple-input multiple- output (massive MIMO) system to improve the detection performance and achieve the high throughput while alleviate the influence to the macrocell users as little as possible. In the cognitive massive MIMO...
A novel printed 60-GHz antenna for MIMO/diversity applications is presented in this paper. This antenna consists of two coplanar waveguides (CPW) feeding triangle-shaped radiating element for orthogonal radiation pattern and a rectangle stub is inserted at 45° between them to achieve high isolation. The antenna is prototyped using RO5880 printed-circuit board. Experimental result shows that the antenna...
A novel printed 60-GHz antenna for MIMO/diversity applications is presented in this paper. This antenna consists of two coplanar waveguides (CPW) feeding triangle-shaped radiating element for orthogonal radiation pattern and a rectangle stub is inserted at 45° between them to achieve high isolation. The antenna is prototyped using RO5880 printed-circuit board. Experimental result shows that the antenna...
A novel compact printed ultrawideband (UWB) slot antenna for MIMO/diversity applications is presented in this letter. The antenna consists of two modified coplanar waveguides (CPWs) feeding staircase-shaped radiating elements for orthogonal radiation patterns, where a rectangle stub is placed at 45 between the CPW to ensure high isolations. By etching two split-ring resonator (SRR) slots on...
A novel pattern diversity slot antenna for ultra-wideband (UWB) application with band-notched characteristics is presented. Two modified coplanar waveguides (CPW) are used to feed the staircase-shaped radiating elements respectively, which generate orthogonal radiation patterns. One rectangle stub placed at 45 degrees axis between the two coplanar waveguides ensures the isolation above 15 dB. Two...
A compact dual-polarized printed ultra-wideband (UWB) wide-slot antenna for multiple-input-multiple-output (MIMO)/ diversity application is proposed. The wide-slot antenna built on a printed circuit board (PCB) consists of two right-angled trapezoid radiation patches with two orthogonal feeding ports. High isolation is achieved by placing a short strip at the middle of the slot and etching an isosceles...
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