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Erik Boch – CTO & VP of Engineering from Dragonwave Inc. looks at the changing hardware requirements for high capacity wireless backhaul especially among for Microcellular deployments for 4G.
This article presents the concept and methodology for the realization of an automatic test procedure based on LabVIEW for RF characterisation of a C-band rotary field phase shifter. Using this software, all the characteristics of a phase shifter intended for phased array application, such as differential phase shift, insertion loss, return loss, rms phase error, insertion phase etc, are measured and displayed graphically.
The growth in mobile broadband services is driving a sea change in the technologies employed to build and operate mobile networks. In particular, the introduction of all-IP transport promises to replace traditional time division multiplexed (TDM) networks to provide network scalability and lower operational costs. To support this network evolution, a new class of licensed microwave backhaul solutions has been introduced to the market, known variously as Packet All-IP or Next Generation radios.
The sudden increase in data traffi c volumes, courtesy smart devices like the iPhone, have made it diffi cult for operators to keep a lid on network costs while they try and keep up with incessantly exploding mobile data demand from burgeoning smart devices, applications, and changing user behavior.
In RF systems, switches are as common as amplifiers, mixers, and PLLs. While many technologies yield good active RF devices, few yield good RF switches. Superior switches are available in Peregrine’s UltraCMOS™ process technology.
To meet growing subscriber demand, mobile operators are forced to add network capacity to enable the delivery of bandwidth-intensive data services. Nowhere are these challenges felt more acutely than in the backhaul network. As operators migrate to all-Ethernet/IP backhaul networks, fiber backhaul can provide the required capacity and beyond, wherever it is deployed; however, the fiber reach is often limited and deploying new fiber links is often prohibitively expensive. Copper has limited capacity and reach, and “traditional” microwave links suffer from spectrum congestion and limited channel sizes. Therefore, current packet-based transport networks fall short in meeting the ever increasing backhaul demands. Operators who rely on wireless backhaul are turning to new frequency bands to provide this capacity while reducing costs. The newly-allocated E-Band spectrum (71-76 GHz, 81-86 GHz and 92-95 GHz) – has many clear technological and economic advantages.
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