Two important microwave remote sensors are the radar and the radiometer.
There have been a number of books written on various aspects of radar, but
there have been only a few written on microwave radiometers, especially on sub-
jects of how to design and build radiometer systems. This book, which is the
second edition of a book originally published in 1989, attempts to fill this void.
Two important microwave remote sensors are the radar and the radiometer.
There have been a number of books written on various aspects of radar, but
there have been only a few written on microwave radiometers, especially on sub-
jects of how to design and build radiometer systems. This book, which is the
second edition of a book originally published in 1989, attempts to fill this void.
Over the past ten years there has been a revolution in the devel-
opment and acceptance of mobile products. In that period, cel-
lular telephony and consumer electronics have moved from the
realm of science fiction to everyday reality. Much of that revolu-
tion is unremarkable – we use wireless, in its broadest sense, for
TV remote controls, car keyfobs, travel tickets and credit card
transactions every day. At the same time, we have increased the
number of mobile devices that we carry around with us. However,
in many cases the design and function of these and other static
products are still constrained by the wired connections that they
use to transfer and share data.
Over the past ten years there has been a revolution in the devel-
opment and acceptance of mobile products. In that period, cel-
lular telephony and consumer electronics have moved from the
realm of science fiction to everyday reality. Much of that revolu-
tion is unremarkable – we use wireless, in its broadest sense, for
TV remote controls, car keyfobs, travel tickets and credit card
transactions every day.
Heterogeneous Network (HetNet): A network that consists of a mix of macro cells and low-power
nodes, e.g. Pico, Femto, Relay Node (RN) and Remote Radio Head (RRH)
The next avatar of the Internet will revolutionize our world. In time, it will
provide us a universal remote control, enabling us to monitor and control
physical objects located anywhere on the planet, using a smart phone. It will
make the universe around us programmable, allowing us to script the behav-
ior of physical objects with electronic commands. This book is about such
an emerging new version of the Internet.
Have you ever looked at some gadget and wondered
how it really worked? Maybe it was a remote control
boat, the system that controls an elevator, a vending
machine, or an electronic toy? Or have you wanted
to create your own robot or electronic signals for a model railroad, or per-
haps you’d like to capture and analyze weather data over time? Where and
how do you start?
Although state of the art in many typical machine learning tasks, deep learning
algorithmsareverycostly interms ofenergyconsumption,duetotheirlargeamount
of required computations and huge model sizes. Because of this, deep learning
applications on battery-constrained wearables have only been possible through
wireless connections with a resourceful cloud. This setup has several drawbacks.
First, there are privacy concerns. Cloud computing requires users to share their raw
data—images, video, locations, speech—with a remote system. Most users are not
willing to do this. Second, the cloud-setup requires users to be connected all the
time, which is unfeasible given current cellular coverage. Furthermore, real-time
applications require low latency connections, which cannot be guaranteed using
the current communication infrastructure. Finally, wireless connections are very
inefficient—requiringtoo much energyper transferredbit for real-time data transfer
on energy-constrained platforms.
