Systems planners face many difficulties when attempting to plan a mobile
or personal communications system for an urban environment. Buildings,
underlying terrain and vegetation can all block or distort signals. This
makes it hard to predict which areas of a particular town will get good
reception and conversely where interference might be a problem.
Planners are increasingly relying on software to help them to decide
where to place their transmitters to get the best coverage and minimum
interference. Current software tools often use ray tracing techniques,
which trace the paths of radio rays emitted from the transmitter on their
way to the receiver.
Researchers involved in this study investigated what sort of building
databases are needed for the software tools. They also developed ray trace
software for millimetric frequencies and tested the models using experimental
data.
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