Interference in WSN occurs mainly because even if direct line-of-sight directions between communicating nodes are not interfered, radio modules in the nodes can still hear unwanted transmissions from other nodes, due to (most usually) omni-directional antennas installed on them.
I covered a product announcement not too long ago at a venue that was spread out across around 40,000 square feet with 12 entrances, and there wasn't a directional sign in sight.
A line-of-sight microwave link uses highly directional transmitter and receiver antennas to communicate via a narrowly focused radio beam.
There's not a directional design touch in sight – but it's classy and safe and comes during a week when Alamuddin has already confirmed her position in the fashion firmament.
In PCL, we assume that a transmitted signal always reaches the designated receiver and therefore Tx and Rx antennas could be viewed as omni-directional with clear line of sight; for VHF and UHF bands' antennas are physically nearly omni-directional in any case.
Directional sensor nodes equipped with ultrasound, infrared, and video sensors differ from traditional omni-directional sensor nodes with their unique characteristics, such as angle of view, working direction, and line of sight (LoS) properties.
Approaching consecutive exits, located downstream from a sight-restricting vertical curvature, drivers have to make directional choices and maneuvers in short sequence following directional signs inside a tunnel.
The coverage difficulties of directional sensor networks include the limited angle of view, working direction, and line-of-sight (LoS) properties.
It presents two main problems: nodes require a directional antenna with beam forming and line of sight propagation path is needed between the transmitter and the receiver.
The presented symbol error rate (SER) performance for the proposed signaling schemes are valid for the transceivers which are in line of sight (LOS) with short distance between them and having highly directional antennas as discussed in Section 2. For these systems, we can assume a simple AWGN channel model.
