ABSTRACT: Wireless network shortly called as WLAN (IEEE 802.11/b/g) works on

two modes – Ad hoc and Infrastructure modes. Ad hoc network is P2P(or F2F) mode. Ad hoc does not use any intermediate device such as Access Point but Infrastructure mode use Access Point as interface between wireless clients. Adhoc mode does not implement Four way handshake and RTS/CTS concept which increases the latency. Moreover it eliminates the hidden terminal and excess exposure problems. Hence it results in high speed transmission.

This project investigates the performance of IEEE 802.11b/g ad hoc networks with minimal channel separation.This analysis reveals how ad hoc mode eliminates the network overhead that is applied to the wi-fi frames in Extended service Mode. The purpose of the project is to establish both ad hoc network and extended service network and to safeguard WLANs using authentication methods.

EXAMPLE OF AN AD HOC WLAN

EXAMPLE OF INFRASTRUCTURE WLAN

HOW PERFORMANCE GAIN WITH MINIMAL CHANNEL SEPARATION

11 channels of 24MHz, offset by 5MHz each

Channel 1 2 3 4 5 6 7 8 9 10 11

Start(MHz) 2400 2405 2410 2415 2420 2425 2430 2435 2440 2445 2450

End(MHz) 2424 2429 2434 2439 2444 2449 2454 2459 2464 2469 2474

2400 MHz 2474 MHz24 MHz

5 MHz

REQUIREMENTS:HARWARE TOOLS: ACESS POINT WIFI,LAPTOPS USB CAMERA

SOFTWARE TOOLS: WINDOWS MEDIA ENCODER

FEATURES:PERFORMANCE GAIN

HIGH SECURITY

INCREASING DISTANCE COVERAGE

ADVANTAGES:AD HOC MODE:NO EXTRA HARDWARE REQUIREMENT

LOW COST

EASY TO MAINTAIN

INFRASTRUCTURE MODE:MORE STABILITY

EASY TO MAINTAIN

IMPROVED SECURITY