Optimizing Reception Performance of UWB Signals in Multipath Fading Channels Using MMSE Adaptive Algorithms

Abstract

This thesis demonstrates

the basics

UWB

technology

, and explain

s

why it is a better

candidate compared to most of the existing technologies in short

-

range high

-

speed

communications, and then discusses the UWB transceiver system architecture, and

shows

the transmission characteristics and the Pulse shapes used for UWB communications.

Followed by showing the UWB channel models used for the UWB Signals’ propagation,

and specifically focusing on the

IEEE 802.15.3a multipath channel model based on

Sale

h

-

Valenzuela channel models as one of most recent important

and

realistic Multi

-

path channel models in the wireless Communications today.

Moreover, the thesis

studies the utilization of a new UWB pulse shape which is the

6

th

derivative Gaussian pulse and

its performance using

two major multiple access

schemes used in UWB Communications; Direct

-

Sequence UWB (DS

-

UWB) and Time

-

Hopping UWB using Pulse

-

Position

-

Modulation technique (TH

-

PPM UWB), along with

their data modulation methods. Finally, this thesis dem

onstrates the design and operation

characteristics of also two major reception techniques used in wireless communications

generally and in UWB communications specifically; the Rake

-

receiver, and the

Minimum

-

Mean Square

-

Error Receiver (MMSE receiver), more

explicitly the thesis

concerns about the MMSE receiver because its algorithm uses Adaptive filtering scheme

with is very important and helpful for detecting the UWB signals in the Multi

-

path

Fading channels suggested in the thesis.

The thesi

s

mostly foc

uses

on comparing between the performance of the DS

-

UWB

and TH

-

PPM UWB as two different transmission schemes over the UWB Multi

-

path

fading channel

utilizing

the Rake

-

receiver technique, and the MMSE

-

receiver algorithm

with adaptive filtering technique

uti

lizing t

he

newly introduced

UWB pulse shape

(

Gaussian 6

th

derivative pulse

); unlike most of the published literature which used the 2

nd

derivative Gaussian pulse. The simulation tool which will be used in the thesis is

MATLAB 201

3

.

a

and MATLAB 201

3

.

b

with

the help of S

IMULINK

Libraries

to show

the better

detection

performance of MMSE receiver utilizing a

daptive algorithms

for

UWB signals in IEEE

802.15.3 multipath channel model which is recommended for

sensitive communications applications

due to the compl

exity of the sys

tem

.