| Author | Wang, Shuoru |
| Call Number | AIT RSPR no. TC-93-08 |
| Subject(s) | Spread spectrum communications
|
| Note | A research submitted in partial fulfillment of the requirement for the degree of Master of
Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This research presents an investigation into the performance of direct-sequence (OS) spread-spectrum
multiple-access (SSMA) communications over a fading radio channel. Three types of
fading channels are considered; a Rayleigh fading channel, a Rici.an fading channel and a Lognormal
fading channel. For each type of channel a complex lowpass impulse response is used
based on either GSM recommended data or indoor wireless measurements at 910 MHz. In
addition, a basic channel model is proposed for estimating the number of multipaths associated
with different radio environments. The fundamental BER performance of a DS/SSMA
communication system is assessed for these channel models and the improvement in performance
obtained using selection diversity and majority logic combining diversity in a RAKE receiver are
investigated. In addition to diversity techniques the performance improvement obtained by using
forward error correction channel coding is investigated. The results demonstrated that broadband
DS/SSMA systems employing selection diversity RAKE receivers and half rate channel coding
can achieve an acceptable performance over a wide range of cellular mobile channels. The
analytical results obtained are verified by simulation. |
| Year | 1993 |
| 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) | O'Farrell, Timothy; |
| Examination Committee(s) | Takahashi, Kenzo;Alku, Paavo; |
| Scholarship Donor(s) | ADB-JAPAN; |
| Degree | Research Studies Project Report (M.Eng.) - Asian Institute of Technology, 1993 |