In wireless communication systems, diversity schemes improve the message reliability and help combat fading. Thus, by exploiting diversity schemes like Space, Time, and Frequency, Space-Time-Frequency codes are generated. These Space-Time-Frequency Block Codes (STFBC) are a combination of Space-Time Block Codes (STBC) and Space-Frequency Block Codes (SFBC). In these Space-Time- Frequency codes, channel codes use time diversity and frequency diversity followed by an orthogonal design which provides spatial diversity. The frequency diversity is applied first and then the time diversity to form the Space-Time-Frequency code.
The performance of 4X1 Space-Time Block Codes (STBC), 4X1 Space-Frequency Block Codes (SFBC), and 4X1 Space-Time-Frequency Block Codes (STFBC) for 4G conditions are evaluated. Simulation results show that Space-Time-Frequency Block Codes (STFBC) are a good compromise in terms of performance and delay. For Space-Time-Frequency Block Codes (STFBC) an asymmetric mapping technique is introduced and the simulation of 4X1 asymmetrically mapped Space-Time-Frequency Block Codes provided a better Bit-Error-Rate (BER) compared to the 4X1 symmetrically mapped Space-Time-Frequency Block Codes. Simulations are performed in MATLAB for Jakes spectrum model and also for COST207 model.
|Advisor:||Yeh, Hen-Geul (Henry)|
|Commitee:||Kwon, Seok-Chul (Sean), Mozumdar, Mohammad|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 57/04M(E), Masters Abstracts International|
|Subjects:||Engineering, Electrical engineering|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be