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SELF-CORRELATION DETECTION AND IN-BAND AND OUT-OF-BAND SIGNAL DETECTION FOR AUTOMATIC GAIN CALIBRATION SYSTEMS
SELF-CORRELATION DETECTION AND IN-BAND AND OUT-OF-BAND SIGNAL DETECTION FOR AUTOMATIC GAIN CALIBRATION SYSTEMS
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机译:自动增益校准系统的自相关检测以及带内和带外信号检测
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摘要
An embodiment of the present invention provides an automatic gain control system for a wireless receiver that quickly differentiates desired in-band signals from high power out-of-band signals that overlap into the target band. The system measures power before and after passing a received signal through a pair of finite impulse response filteres (205-IP), (210-IP), (205-Q), (210-Q) and (220) that largely restrict the signal's power to that which is in-band. By comprising the in-band energy of the received signal after filtering to the total signal energy prior to filtering (215), it is possible to determine whether a new in-band signal has arrived. The presence of this new in-band signal is then verified by a multi-threshold comparison of the normalized self-correlation (225) to verify the presence of a new, desired in-band signal.
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