Study of multi-user detection in wideband code division multiple access | |
| Author | Manatsavee Boonyarattanasoonthorn |
| Call Number | AIT Thesis no.TC-02-18 |
| Subject(s) | Code division multiple access Data transmission systems |
| 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-02-18 |
| Abstract | The Wideband Code Division Multiple Access (WCDMA) has been selected as the main air interface standard used to meet the high capacity and high bandwidth requirements of the third generation mobile system. The main problem of this technology is multiple access interference (MAI) and various multi-user detection (MUD) methods proposed to mitigate this problem. In the search for suitable MUD solutions most emphasis has been placed on the performance and complexity under narrow band CDMA system. The question of performance and complexity of MUD techniques under WCDMA system has not been fully explored. In this thesis, the performance of MUD under WCDMA system has been evaluated. In the receiver, multistage successive interference cancellation (SIC), multistage parallel interference cancellation (PIC) and decorrelating detector are used to eliminate MAI. The performance is analyzed under a frequency selective Rayleigh fading channel condition. The RAKE receiver is used in each technique due to multipath environment. The bit error rate (BER) performance is analyzed with reference to the single user bound for different parameter settings. Simulation results show that the SIC and PIC detector has nearly the same BER performance and their performance are near to the single user bound when the number of stage increased. Both SIC and PIC detector outperform decorrelating detector. In addition, the complexity has been compared between decorrelating, SIC and PIC detector for the sake of selection of which technique is suitable for the system. The complexity of SIC and PIC detector is much less than of decorrelating detector. At almost the same BER performance, the complexity of PIC detector is less than that of SIC detector. Therefore, the PIC detector can be considered desirable to be used in the system. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-02-18 |
| 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) | Teerapat Sanguankotchakorn ;Fernando, W. A. C.; |
| Scholarship Donor(s) | Nokia (Thailand) Ltd.; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2002 |