Patent ID: 7212512
Filing Date: 2007-05-01
Classification: H03J

Abstract:
1. A frequency correction system for a wireless device operating in a wireless LAN in which communications are coordinated via a central hub, comprising: a frequency correction circuit that determines a frequency differential between a local frequency reference signal and a received signal and that provides a frequency offset signal indicative thereof; an inverter, coupled to the frequency correction circuit, that inverts the frequency offset signal and that provides an inverted frequency offset signal; a combiner, coupled to the inverter, that adjusts frequency of a transmit signal by the inverted frequency offset signal; and a controller, coupled to the frequency correction circuit, the inverter and the combiner, that controls whether a transmit signal is adjusted in frequency by the inverted frequency offset signal wherein the controller detects signals received from the central hub and controls the inverter and combiner to adjust transmit frequency to correspond to a frequency of at least one signal received from the central hub.