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AN ECONOMICAL IMPLEMENTATION OF ACCURATE AND REPEATABLE RSSI IN A WIRELESS SYSTEM

IP.com Disclosure Number: IPCOM000009526D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-29

Publishing Venue

Motorola

Related People

Authors:
Michele Clayton Art Helwig John Tunny Joe Walsh

Abstract

The accuracy, repeatability and resolution of the received signal strength (RSSI) in a network sub- scriber unit are very dependent upon the characteris- tics of the individual hardware components. Due to variation in parts, the accuracy of RSSI measure- ments in a network subscriber unit has always been less than that needed to detect subtle changes in RF performance. In addition, the network subscriber unit does not measure RSSI to a tine resolution and the repeatability of readings is less than desirable for some applications. Network subscriber units also lack the ability to provide accurate RSSI readings over a wide range of temperatures without a great deal of cost. Typically, accurate RSSI readings are implemented with complex circuits consisting of many hardware devices. Hardware of this type is costly to build due to the number of circuits that need to be tuned. The circuit method of implementa- tion also requires that the hardware parts produce linear or nearly linear RSSI. If the hardware is not linear, then the control and measurement software is very complex and typically involves at least a sec- ond order correction or interpolation algorithm.