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The design of a dual-channel broadband millimeter-wave receiver front-end for the next generation mobile communication is presented in this article. The front-end operates at 28GHz with 2GHz and 500MHz bandwidth in radio frequency (RF) and immediate frequency (IF) respectively. A scheme of single downconversion is used and a compact substrate integrated waveguide (SIW) bandpass filter is designed...
A future smart phone will become a mobile terminal that communicates with a number of diverse sensors perpetually. This never-resting RF communication will cut the battery life drastically, unless the power consumption per RF communication reduces accordingly while maintaining reasonable performance. This paper presents the recent evolution of a translational circuit (or N-path filter) to enable a...
The average smart phone user picks up the device 1,500 times a week. Wireless communication appears to be taking over our lives but it also presents interesting challenges to RF designers. This paper contends that the mobile terminal will emerge as a central command post for most of our daily affairs and will therefore sustain an increasingly heavier load in terms of speed, power dissipation, and...
Nowadays the spectrum regulations landscape is changing towards more flexible spectrum management schemes, such trends are expected to make additional spectrum resources available and lowers the spectrum access hurdles. In this paper, different spectrum aggregation scenarios have been compared focusing on the tradeoff between the total cost of ownership and the targeted QoS under different market...
The objective of this paper is to present a realization of vertical Handover which is applicable for 4G communication networks. The authors have realized vertical handover in four levels. Four different experiments have been conducted in the laboratory corresponding to four levels from basic fundamental level to final complex levels of vertical handover. It is observed that acceptance; lock and track...
The development of mobile communication services has lead to the increase the use of wireless spectrum. However, the persuasion of the overly crowded spectrum is not due to the scarcity of usable radio frequencies but to the current static spectrum management policy. This reveals many idle frequency bands in both time and space. The cognitive radio network (CRN) is a key solution to exploit the existing...
In this paper several RF architectures have been investigated in order to find a flexible, reconfigurable and multi-mode RF front-end for Software Defined Radio (SDR). The objective is to develop a new professional mobile broadband communication system, oriented to Public and Governmental Services. Different receiver prototypes based on the studied architectures have been implemented. The comparison...
This paper presents the design and implementation of a low power wideband mixer for multistandard receivers, covering global system for mobile communications, universal mobile telecommunications system, wireless local area network, Bluetooth, and ultra-wideband. The circuit topology is based on the folded technique with a current reuse shunt feedback RF input stage operating at a low supply voltage...
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