Symbol-technologies Spectrum24 AP-4131 Manual de usuario descargar pdf (Pagina 28)

Introduction

18 AP-4131 Access Point Product Reference Guide

1.3.5 Direct-Sequence Spread Spectrum

Spread spectrum (broadband) uses a narrowband signal to spread the

transmission over a segment of the radio frequency band or spectrum.

Direct-sequence is a spread spectrum technique where the transmitted signal

is spread over a particular frequency range. The Spectrum24 AP-4131access

point uses Direct-Sequence Spread Spectrum (DSSS) for radio

communication.

Direct-sequence systems communicate by continuously transmitting a

redundant pattern of bits called a chipping sequence. Each bit of transmitted

data is mapped into chips by the access point and rearranged into a

pseudorandom spreading code to form the chipping sequence. The chipping

sequence is combined with a transmitted data stream to produce the AP

output signal.

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Symbol-technologies Spectrum24 AP-4131 Manual de usuario Pagina 28