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Spread-spectrum (SS) techniques are widely used in many military communication systems because they have many advantages, such as ranging capabilities, antijam protection, low probability of detection or interception, and multiple access capability. There are many forms of SS, such as a direct sequence spread spectrum (DS/SS), frequency hopping (FH), hybrid DS-FH, and ultrawideband (UWB). In all cases,...
This paper presents a power detection based I/Q imbalance self-calibration technique to compensate signal path gain and phase mismatch in a reconfigurable low-IF receiver. The calibration can be carried out at startup to improve the image rejection ratio (IRR) of the IF complex-bandpass filter, and then configuration words are saved. The system employs an analog I/Q calibration module to adjust signal...
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