AN9820.1

ee www.DataSheet4U.com TM A Condensed Review of Spread Spectrum Techniques for ISM Band Systems Application Note May 2000 AN9820.1 [ /Title in data transmission rate when compared with that for DQPSK, (AN98 Introduction and radios utilizing the MBOK modulation format have now The approval by the IEEE of the 20) achieved FCC certification. This application note provides an 802.11 Standard for wireless LANs has /Suboverview of several frequency hopping and direct sequence given the WLAN industry a needed techniques used for wireless data transmission in the ISM ject (A boost. Manufacturers of WLAN band. Included is a discussion of how the MBOK modulation Consystems are now cooperating in performing interoperability technique is able to achieve Ethernet speeds over three densed testing. Such testing is providing assurance that 802.11 separate band-limited channels within the ISM band. compliant equipment purchased from one manufacturer will Revie interoperate with 802.11 radios manufactured by other OEMs. It will be shown that for a given increase in waveform w of This is an important consideration for MIS managers who complexity the MBOK modulation adds very little system Spread desire to use WLAN technology to provide mobility with complexity in terms of the number of components and radio Specconnectivity to their workforce. bill of materials (BOM) cost, when compared to a 2Mbit/s trum radio with QPSK modulation. The November 1997 approved 802.11 Standard defines the Techp...