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Varun Kher
Varun Kher

There are two types of wireless local area networks (WLANs): 1) Ad-hoc networks which allow direct communication between wireless nodes or stations without an access point. 2) Infrastructure networks which use an access point as a bridge between the wireless and wired networks, requiring all communication between stations or to the wired network to go through the access point. The physical layer for WLAN uses either direct sequence spread spectrum or frequency hopping spread spectrum radio transmission, with direct sequence spread spectrum being more significant in the market currently.

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SYNOPSIS Spread Spectrum Applications: Wireless Local Area Network (WLAN) has two types of networks namely 1) Ad-hoc Network: it is simple network where communications are established between two or more wireless nodes or stations( STAs) in a given coverage area without the use of an access point (AP) or server .The STAs recognize each other and communicate directly with each other on a peer to peer level. It is also known as Independent Basic Service Set (IBSS). 2) Infrastructure Network: it is a more flexible configuration in which Basic Service Set (BSS) contains AP. The AP forms a bridge between the wireless and wired LAN. The STAs do not communicate on a peer-peer basis. Instead, all communications between STAs or between a STA and a wired network client go through the AP. APs are not mobile and a form part of the wired network infrastructure. Physical Layer (Radio Technology): There are three variations in the physical layer: one is infrared (IR) and the other two are RF transmissions: DSSS(direct sequence spread spectrum) and FHSS(frequency hopping spread spectrum) , only the RF transmission has significance in the market.
DSSS FHSS

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Synopsis

  • 1. SYNOPSIS Spread Spectrum Applications: Wireless Local Area Network (WLAN) has two types of networks namely 1) Ad-hoc Network: it is simple network where communications are established between two or more wireless nodes or stations( STAs) in a given coverage area without the use of an access point (AP) or server .The STAs recognize each other and communicate directly with each other on a peer to peer level. It is also known as Independent Basic Service Set (IBSS). 2) Infrastructure Network: it is a more flexible configuration in which Basic Service Set (BSS) contains AP. The AP forms a bridge between the wireless and wired LAN. The STAs do not communicate on a peer-peer basis. Instead, all communications between STAs or between a STA and a wired network client go through the AP. APs are not mobile and a form part of the wired network infrastructure. Physical Layer (Radio Technology): There are three variations in the physical layer: one is infrared (IR) and the other two are RF transmissions: DSSS(direct sequence spread spectrum) and FHSS(frequency hopping spread spectrum) , only the RF transmission has significance in the market.