| Author | Duong Thi Anh Thu |
| Call Number | AIT Thesis no.TC-01-07 |
| 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 Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-01-07 |
| Abstract | Finally, I very much thank the scholarship donor, the Government of Finland, for
Transmitter diversity is an effective technique to reduce the degradation of the signal to
noise ratio caused by the fading and the Doppler spread in mobile radio channel.
Recently, Multi-Carrier Code Division Multiple Access (MC-CDMA) is proposed as a
multi-accessed multi-carrier modulation scheme in which the channel in each sub-carrier
can be considered as a flat fading channel. In the thesis, transmitter diversity using a
suitable Space-Time code modulation scheme has been studied. MC-CDMA incorporated
with Space-Time Codes (STC), designed for high capacity multi-antenna systems, can be
used in the frequency selective fading environment.
This research applied and discussed a new technique to estimate the channel
parameters of a MC-CDMA system for downlink transmission using training symbols
inserted at the transmitter. The derived estimator is optimized in the sense of minimizing
the mean square error (MSE) based on the received signal and the training signal of all
sub-carriers. For the two transmit antenna - two receive antenna MC-CDMA system
considered with transmission efficiency 0.1848 bits/s/Hz, the Bit Error Rate (BER)
degradation of real channel estimation is 2 - 3dB compared to perfect channel estimation.
As seen from the results, the system using a channel interleaver is not sensitive to a
number of the accessed users as well as the velocity of Mobile Station (MS).
The application of Trellis Coded Modulation (TCM) is also considered. It is shown
that the MC-CDMA system of both the real channel estimation and perfect estimation for
TCM has a larger degradation than for Space Time Coded Modulation (STCM). |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-01-07 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Information and Communications Technologies (DICT) |
| Academic Program/FoS | Telecommunications (TC) |
| Chairperson(s) | Rajatheva, R.M.A.P.; |
| Examination Committee(s) | Makeliiinen, K. ; Fernando, W.A.C. |
| Scholarship Donor(s) | Government of Finland; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |