Performance of MIMO MC-CDMA uplink system with V-BLAST and multiuser detection in frequency selective rayleigh fading channel | |
| Author | Chulawee Neeratanaphan |
| Call Number | AIT Thesis no.TC-05-3 |
| Subject(s) | Space time codes MIMO systems 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 |
| Abstract | Systems with efficient spectrum usage and high capacity will be needed for 4G and beyond. Multiple input multiple output (MIMO), space -time coding, multiuser detection (MUD) and multicarrier code-division multiple access (MC-CDMA) are some of the techniques found to achieve spectral efficie ncy, capacity increased, and robustness against frequency selective fading. V-BLAST (Vertical Bell Laboratories Layered Space -Time) is one proposed technique for achieving high spectral efficiency. In this thesis, a system model that combines all these tec hniques is proposed and studied through simulation. The performance of this system is investigated for varying numbers of transmit antennas, receive antennas and for user groupings using the same spreading code. Furthermore, successive interference cancellation (SIC) and parallel interference cancellation (PIC) based V-BLAST are compared in both system performance and complexity. Finally, STBC (Space-Time Block Code) is applied together with V-BLAST and system performance is studied. The simulation results show that MIMO MC-CDMA with V-BLAST and multiuser detection system can offer very high data rate as it is able to provide twice and triple the data rate when 2 and 3 transmit antennas are used respectively with about the same BER as single transmit antenna case. For the grouping effect, it is clear that with a small number of spreading codes more users can be supported by using this proposed system. Moreover, when the number of receive antennas is increased, the BER (Bit Error Rate) performance is improved especially in the cases where one spreading code is shared by more than one user. With significantly less complexity, PIC based V-BLAST performs similar to SIC V-BLAST. Finally the simulation result shows that there is significant improvement in BER performance when STBC is applied. |
| Year | 2005 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| 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.;Erke, Tapio J. |
| Scholarship Donor(s) | His Majesty the King of Thailand |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |