Manual Lancom L-320agn Wireless (page 15 of 97) (English)

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LANCOM L-32x Access Point series

 Chapter 1: Introduction

by the surrounding surfaces causing a broadcast signal to reach the WLAN cli-

ent's antenna over many different paths; this is also referred to as "multipath

propagation". Each of these paths has a different length meaning that indivi-

dual signals reach the client with a different time delay.

These time-delayed signals interfere with each other at the WLAN client and

significantly weaken the original signal. For this reason, conventional WLAN

networks should always have a direct line of sight (LOS) between transmitter

and receiver in order to reduce the influence of reflections.

MIMO technology transforms this weakness in WLAN transmission into a

strength that allows an enormous increase in data throughput. As mentioned

above, it is virtually impossible to transmit different signals on the same chan-

nel simultaneously as the receiver cannot distinguish between them. MIMO

uses the reflection of electromagnetic waves and the associated spatial aspect

to obtain a third criterion for identifying the signals.

A signal sent by transmitter A and received by receiver 1 follows a different

path than a signal from transmitter B to receiver 2. Due to the different reflec-

tions and changes in polarization that both signals experience along their

paths, each of these paths takes on its own characteristics. When data trans-

mission starts, a training phases records the characteristics of the path by

transmitting standardized data. Subsequently, the data received here is used

to calculate which data stream the signals belong to. The receiver decides for

itself which of the incoming signals is to be processed, thus avoiding loss from

interference.

Access Point

WLAN-Client

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Lancom L-320agn Wireless Manual

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