Large-signal automated load-pull of adjacent-channel power for digital wireless communication systems

A large-signal fully automated load-pull system for characterization of adjacent-channel power for /spl pi//4-DQPSK-based digital wireless communication systems is described. It is demonstrated that the commonly held beliefs that adjacent-channel power for the North American digital system follows a...

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Bibliographic Details
Main Authors: Sevic, J.F., Steer, M.B., Pavio, A.M.
Format: Conference Proceeding
Language:English
Subjects:
Digital modulation
Digital systems
Frequency
Impedance
Linearity
MESFETs
PHEMTs
Power measurement
Time division multiple access
Wireless communication
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Description
Summary:A large-signal fully automated load-pull system for characterization of adjacent-channel power for /spl pi//4-DQPSK-based digital wireless communication systems is described. It is demonstrated that the commonly held beliefs that adjacent-channel power for the North American digital system follows a third-order process and that adjacent-channel power for the Japanese digital system follows a fifth-order process are in general not true. Instead, it is shown that adjacent-channel power is a composite of third- and fifth-order nonlinearities, the relative contributions of each being load impedance and device dependent. A simplified power series analysis coupled with spectral decomposition of the digitally modulated source signal is used to characterize conditions under which third-order intermodulation will correlate to adjacent-channel power.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.1996.511050