| Author | Mahesan Aravindan |
| Call Number | AIT Thesis no.TC-99-14 |
| Subject(s) | Code division multiple access
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. School of Advanced Technologies |
| Publisher | Asian Institute of Technology |
| Abstract | Wideband CDMA has been selected as a radio interface for the third generation
wireless system. The proposed scheme utilizes high bit rates and variable bandwidths to
provide multimedia capabilities. When different services are provided by different
bandwidths, interbandwidth interference may disto1i the signals, eventhough each user is
differentiated by different orthogonal spreading codes. The use of orthogonal codes reduces
this interference, but when it encounters multipath channel, the orthogonality will be partially
lost.
In this thesis, performance of multi bandwidths over a Rayleigh multipath fading
channel is studied through simulation. Application of high data rate transmission is
considered, in the WCDMA system. The effect of bit error performance in a multipath fading
environment is analyzed by considering typical high and low mobile speeds. Performance of
single bandwidth is also evaluated for comparison.
Based on the simulation results, when single bandwidth is used, the lower bandwidth
perf01ms better than higher bandwidths. When different bandwidths are simultaneously used
in the system, the higher bandwidths perform better than lower bandwidths. The performance
of this system degrades significantly for increased correlation in fading for low mobile speed.
Hence, in the third generation wireless system, when the user accesses different services such
as voice data and high speed multi media, the service which uses higher bandwidth performs
better than lower bandwidth services. |
| Year | 1999 |
| Type | Thesis |
| School | School of Advanced Technologies |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Ahmed, Kazi M.; |
| Examination Committee(s) | Rajatheva, R.M.A.P. ;Teerapat Sa-nguankotchakom; |
| Scholarship Donor(s) | Government of Finland ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology |