The transceiver structure is based on spatial focusing property of OTR-UWB system.
The proposed transceiver structure is based on spatial focusing property of OTR.
The receiving antenna of proposed SIMO-OTR should not be placed in spatial focusing depth of each other.
Furthermore, it should be noted that these results do not take into account the spatial focusing property of TR which allows addressing different users while limiting electromagnetic pollution.
These differences include a shorter wavelength component moving with a lower wave celerity, nonlinear spatial focusing, and a mean water level that varies in space.
The design is based on a combination of axially symmetric 90° sector spherical deflector with second-order spatial focusing preceded by hollow conical deceleration immersion lens.
On the other hand, as the main advantage of TR is its time and spatial focusing properties, combining it with a power allocation algorithm would be equivalent to changing the shape of the filter, hereby destroying the TR focusing effects.
The receiving antenna should not be placed in spatial focusing depth of each other, therefore the channels h 1 ( t ), h 2 ( t ),..., h N r ( t ) are almost uncorrelated.
The higher free-space path loss motivates a design shift from an omni-directional operation to more spatial focusing, using high-gain beam-forming antennas and multiple input/multiple output (MIMO) approaches.
Low spatial focusing gain of OTR-UWB system at distance r away from the intended receiver indicates that a nearby receiver at that location would not be able to detect the signal.
