Title page for ETD etd-02182004-133334

Type of Document

Master's Thesis

Author

Ali, Saajed

Author's Email Address

swani@vt.edu

URN

etd-02182004-133334

Title

Concatenation of Space-Time Block Codes with ConvolutionalCodes

Degree

Master of Science

Department

Electrical and Computer Engineering

Advisory Committee

Advisor Name	Title
Woerner, Brian D.	Committee Chair
Kachroo, Pushkin	Committee Member
Tranter, William H.	Committee Member

Keywords

Rayleigh fading
convolutional codes
transmit-diversity
space-time codes

Date of Defense

2004-02-06

Availability

unrestricted

Abstract

Multiple antennas help in combating the destructive effects of fading as well as
improve the spectral efficiency of a communication system. Receive diversity techniques
like maximal ratio receive combining have been popular means of introducing multiple
antennas into communication systems. Space-time block codes present a way of
introducing transmit diversity into the communication system with similar complexity
and performance as maximal ratio receive combining. In this thesis we study the
performance of space-time block codes in Rayleigh fading channel. In particular, the
quasi-static assumption on the fading channel is removed to study how the space-time
block coded system behaves in fast fading. In this context, the complexity versus
performance trade-off for a space-time block coded receiver is studied.
As a means to improve the performance of space-time block coded systems
concatenation by convolutional codes is introduced. The improvement in the diversity
order by the introduction of convolutional codes into the space-time block coded system
is discussed. A general analytic expression for the error performance of a space-time
block coded system is derived. This expression is utilized to obtain general expressions
for the error performance of convolutionally concatenated space-time block coded
systems utilizing both hard and soft decision decoding. Simulation results are presented
and are compared with the analytical results.

Files

Filename		Size	Approximate Download Time (Hours:Minutes:Seconds)
Filename		Size	28.8 Modem	56K Modem	ISDN (64 Kb)	ISDN (128 Kb)	Higher-speed Access
	ETD.pdf	499.57 Kb	00:02:18	00:01:11	00:01:02	00:00:31	00:00:02