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.

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