Packet acquisition and channel tracking for a wireless communication device configured in a zero intermediate frequency architecture

USRE42799E1 · kind E1 · reissue

Assignee

• Intellectual Ventures II LLC · US

Inventors

• Keith R. Baldwin · Melbourne Beach, US
• Mark A. Webster · Bethlehem, US

Key dates

• Filing date: Jun 27, 2008
• Grant date: Oct 4, 2011
• Expiry date: Jun 27, 2028

Classification

• Technology area (CPC —): General

Abstract

A method of controlling operation of a wireless device configured in a zero intermediate frequency architecture including a DC loop and a gain loop. The method includes processing energy in a wireless medium to generate a corresponding receive signal, monitoring the receive signal via a predetermined measurement window, detecting a changed condition in the channel, holding the gain feedback control loop at a constant gain level, and operating the DC loop in an attempt to search a stable DC value for the receive signal while the gain loop is held constant. A first case is DC saturation, where the gain is held constant until DC is controlled. A second case is clear channel assessment, where a prior stored gain setting is applied to the gain loop after detecting the end of the packet. A third case is preparation for receiving an expected acknowledgement packet after transmitting a packet, where again a prior stored gain setting is applied to the gain loop and DC is searched.