Abstract: Disclosed is an antenna apparatus and a wireless communication system. According to one implementation, the antenna apparatus includes, a near field communication antenna and a cable that is connected to the near field communication antenna. The cable of the antenna apparatus is connected to a communication transceiver. The antenna apparatus further comprises a matching circuit that is connected to the cable and the communication transceiver circuit. The matching circuit matches impedances and tunes the resonance frequency of the near field communication antenna. The communication circuit exchanges signals.

Abstract: The present invention is an apparatus and method for blind automatic gain control in a digital communications device. The present invention includes a maximum error detector (MED) (142) which includes a gain error evaluator (GEE) (144) and a maximum value detector (MVD) (146). Also included is a decision gain adjustor (DGA) (148) which includes a gain value controller (GVD) (150) and an initial value buffer (IVB) (152). The GEE (144) is operable to generate a gain error signal in accordance with an input baseband signal (x) and a sliced version of the input baseband signal (x'). The MVD (146) is operable to generate a renew signal in accordance with the sliced version of the input baseband signal (x') and a first predetermined reference value. The GVD (150) is operable to converge the gain error signal (.DELTA.x) in a first state using a first convergence technique and to converge the resultant signal in a second state using a second convergence technique.