SELF-CALIBRATION APPARATUS AND METHOD FOR COMMUNICATION DEVICE

摘要

A calibration network (110-130, 180, 182) for providing weighting factors for a beam pattern of an adaptive array of antenna elements (86) of a communication device (70) is self-calibrated by modulating and demodulating a narrowband channel with a common broadband signal containing a pseudo-random number sequence (PRNS) having a relatively short pulse rate per bit and a power level relatively low to that of a noise threshold of the narrowband signal channel. Errors introduced into the PRNS by a selected complementary one of a reception (116) and transmission (114) path are determined by calculating a processing gain for the calibration network based upon the errors introduced into the PRNS. Then, by applying a convergence algorithm (130) to resolve amplitude and phase variations introduced by components (112-118) in the selected path, these amplitude and phase variations are mitigated against by the communication device (70) by subsequently determining and applying a correction factor (126) appropriate to compensate for these variations.