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Transmitter performance tests are aimed at quantifying how well the transmitter functions of a WLAN device are implemented.
Acoustic telemetry has quickly become a powerful tool for ecological research in aquatic systems, yet our knowledge of in situ transmitter performance remains limited.
A closely related approach is used when evaluating transmitter performance in the presence of linear and nonlinear distortions using Error Vector Magnitude (EVM) [51 53].
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Equipped with such knowledge, the secondary transmitter performs power control in order to achieve improved performance.
It has been shown that when perfect or partial channel state information (CSI) is available at the transmitter, the performance and capacity of a space time coded system can be further improved.
However, in terms of transmitter PHY performance, we see a 4 dB difference; this is mainly due to signal power measurement errors (as noted before, it was not possible to test the transmitters in the same power range due to limited output power of the Zigduino).
From these figures, one can observe that as the primary receivers move farther from the secondary transmitters, the performance of the secondary network improves.
In case that reliable channel knowledge is available at the transmitter, good performances for transmissions can be accomplished by means of adaptation to the channel using, e.g., techniques like adaptive multi-user scheduling[2], and adaptive power loading, modulation and coding[3, 4].
Moreover, if some channel knowledge is available at the transmitter, much better performance can be attained [5, 6].
At the transmitter side, the performance is evaluated in terms of the CCDF of the PAPR versus its threshold.
Thus, it is crucial to explore the role of channel uncertainty at the transmitter in system performance.
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CEO of Professional Science Editing for Scientists @ prosciediting.com