| Author | Nuttavudh Satravaha |
| Call Number | AIT RSPR no. TC-95-13 |
| Subject(s) | Artificial satellites in telecommunication
|
| Note | A research study submitted in partial fulfillment of the requirement for the degree of
Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | In this research study an investigation into a low-complexity Soft-Output Viterbi
Equalization (SOVE) is made. The algorithm delivers M-ary reliability information for each
detected symbol. The reliability information value is calculated by using Bayes' theorem. Two
solutions oflow-complexity SOVE named one-dimensional Vertical update SOVE (V-SOVE) and
one-dimensional Horizontal update SOVE (H-SOVE) are presented and applied at the cost of
suboptimality. The quality of the soft-outputs produced from the V-SOVE and H-SOVE is
evaluated in terms of Bit Error Rate (BER).
The performance of the system using the V-SOVE and the H-SOVE is simulated by use of
computer simulation. The Typical Urban channel specified by GSM standards and the n/4- shiftedDifferential Quadrature Phase Shift Keying (DQPSK) modulation method are used in the
simulation model. Perfect knowledge of the channel coefficients are assumed in the simulation
work. Comparisons between the performance of the V-SOVE, the H-SOVE and the classical
Viterbi Equalizer (VE) are made. |
| Year | 1995 |
| Type | Research Study Project Report (RSPR) |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Makelainen, Kimmo
|
| Examination Committee(s) | Chindakorn Tuchinda ;Zhang, Jian-Guo
|
| Scholarship Donor(s) | Finnish International Development Agency (FINNIDA),
Finland |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 1995 |