k3ng_antenna_tuner：基于Arduino的自动业余无线电天线调谐器
2021-02-01 11:15:53
1.01MB
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2021-01-31 02:01:34
15.1MB
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Lumia 950/950XL 开启 FM的工具——interop可用版本
2021-01-28 04:44:23
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The Mobile Radio Propagation Channel
2020-04-06 03:06:01
4MB
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This course is to introduce Radio Network Evolution and principle. After this course, you can know radio network Evolution, understand GSM/WCDMA/LTE Radio Network System, network structure and key Technology.
2020-03-13 03:05:20
4.59MB
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Opportunistic unlicensed access to the (tem-
porarily) unused frequency bands across the
licensed radio spectrum is currently being inves-
tigated as a means to increase the efficiency of
spectrum usage. Such opportunistic access calls
for implementation of safeguards so that ongo-
ing licensed operations are not compromised.
Among different candidates, sensing-based
access, where the unlicensed users transmit if
they sense the licensed band to be free, is partic-
ularly appealing due to its low deployment cost
and its compatibility with the legacy licensed sys-
tems. The ability to reliably and autonomously
identify unused frequency bands is envisaged as
one of the main functionalities of cognitive
radios. In this article we provide an overview of
the regulatory requirements and major chal-
lenges associated with the practical implementa-
tion of spectrum sensing functionality in
cognitive radio systems. Furthermore, we outline
different design trade-offs that have to be made
in order to enhance various aspects of the sys-
tem’s performance.
2020-03-09 03:03:19
176KB
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