الفهرس 
HISTORY OF WIRELESS COMMUNICATIONOnly 14 pages are availabe for public view
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Abstract
The performance of Wireless Local Area Networks depends heavily
upon the fact that one user have to be sending at a time, that
technique is called Carrier Sense Multiple Access - Collision Avoidance
(CSMNCA). In this technique, all the resources are exploited for this
user to give him the maximum bit rate the channel can deliver. However,
in some cases that is not the case. For example, in a control system, we
need a low transmission rate system, where at the same time we need
many users to use the medium at the same time in a very secure way. For
this case, we suggest a Code Division Multiple Access (COMA) system
using Direct Sequence Spread Spectrum (DSSS) technique, and Binary
Phase Shift Keying (BPSK) modulation technique.
This thesis presents a detailed study on the perf o rm ance of the
suggested system. It also presents a complete circuit design for the
system proposed using discrete components and using integrated circuit
and testing the functionality of the system by downloading it on a Field
Programmable Gate Array (FPGA).
The work includes making a software program to communicate
with the serial port (RS232) of the computer in order to act as a data
source for the suggested system. Another part was to measure the
performance of the system and see the effect of the interference of
simultaneous users on the system. One last thing was to compare the
performance of the system using different implementations, one using
discrete components and the other using integrated circuits. The system
was eventually implemented on an FPGA, and it was proved to function
The performance of Wireless Local Area Networks depends heavily
upon the fact that one user have to be sending at a time, that
technique is called Carrier Sense Multiple Access - Collision Avoidance
(CSMNCA). In this technique, all the resources are exploited for this
user to give him the maximum bit rate the channel can deliver. However,
in some cases that is not the case. For example, in a control system, we
need a low transmission rate system, where at the same time we need
many users to use the medium at the same time in a very secure way. For
this case, we suggest a Code Division Multiple Access (COMA) system
using Direct Sequence Spread Spectrum (DSSS) technique, and Binary
Phase Shift Keying (BPSK) modulation technique.
This thesis presents a detailed study on the perf o rm ance of the
suggested system. It also presents a complete circuit design for the
system proposed using discrete components and using integrated circuit
and testing the functionality of the system by downloading it on a Field
Programmable Gate Array (FPGA).
The work includes making a software program to communicate
with the serial port (RS232) of the computer in order to act as a data
source for the suggested system. Another part was to measure the
performance of the system and see the effect of the interference of
simultaneous users on the system. One last thing was to compare the
performance of the system using different implementations, one using
discrete components and the other using integrated circuits. The system
was eventually implemented on an FPGA, and it was proved to function