Browse Prior Art Database

Method for Implementing Receive Antenna Diversity in 802.11b Clients

IP.com Disclosure Number: IPCOM000017131D
Publication Date: 2003-Jul-22
Document File: 2 page(s) / 31K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that improves the performance of an 802.11b client by selecting the appropriate antenna, when there is no hardware support for per-packet antenna diversity. Benefits include improved range and multi-path performance for an 802.11b client.

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Method for Implementing Receive Antenna Diversity in 802.11b Clients

Disclosed is a method that improves the� performance of an 802.11b client by� selecting the� appropriate antenna, when there is no hardware support for per-packet antenna diversity. Benefits include improved range and multi-path performance for an 802.11b client.

Background

Currently, most per-packet antenna diversity algorithms need hardware support.

General Description

The disclosed method provides a software method for implementing per-packet diversity in clients where there is no hardware support. The algorithm allows quick locking to an antenna, and leaves enough of the preamble sequence for timing, carrier offset estimation, and equalizer initialization. The disclosed method toggles the software controlled antenna select switch between the two antennas, and then selects the� appropriate antenna for receiving the 802.11 frames (see Figure 1). Whenever the antenna is switched, automatic gain control (AGC) is started so that the appropriate gain is set to receive the frame. Then there is a check to detect a valid barker before 8 usec. If a valid barker is not detected, then the antenna is switched and AGC is started and the check for a valid barker is repeated. Once a valid barker is detected and it exceeds the barker correlator threshold, the antenna is locked. If the signal does not exceed the barker correlator threshold, then antenna switching is started again.

Advantages

The disclosed method is a sim...