A robust MIMO system using RCMC CDMA in a frequency selective rayleigh fading channel | |
| Author | Chakraborty, Sampurna |
| Call Number | AIT Thesis no.TC-06-05 |
| Subject(s) | 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 |
| Series Statement | Thesis ; no. TC-06-05 |
| Abstract | Robustness issues in Multiple Input Multiple Output (MIMO) system has been under investigation for quite some time. To achieve diverse traffic requirements of 4G and beyond, problems of multiple access interference and channel introduced impairments draws attention and needs to be solved. Multicarrier Code Division Multiple Access (MC-CDMA) signaling incorporating powerful performance improving techniques has been under investigation for quite some time and various research activities of Orthogonal Frequency Division Multiple Access pertaining to robustness factors such as interference suppression techniques, multiuser detection, advanced error control coding, diversity and smart antenna has been performed lately. But it is observed that the complexity of the MC-CDMA system increases as a result of these Multiple Access Interference (MAI) suppression techniques. Particularly it is desirable that both MAI free property and simple architecture be implemented in a mobile unit. In this thesis, the robustness of MIMO against multi-access interference is dealt with the use of a signal processing technique called Repetitively Coded MC CDMA (RCMC CDMA) in a frequency selective Rayleigh fading channel for multiuser multi-transmit antenna uplink system. Such a technique is selected as very less effort is needed to suppress MAI at the receiver thus providing a simple architecture design in the mobile unit. The robustness offered in terms of MAI is studied by comparing this system with an uplink system using MC-CDMA with V-BLAST and multiuser detection technique under various conditions. Based on the simulations it is found that the performance of RCMC CDMA system outperforms the MC CDMA system with Multi-user Detection Techniques (MUD) with respect to MAI for same parameters. The performance is studied for increasing number of users in the system, increasing number of transmit antennas, receive antennas and the number of transmitted symbols. The performance of RCMC CDMA system improves as the receive diversity is increased and the number of transmitted symbols is increased. Also the proposed system supports more users than the MC CDMA system for a given Eb/N0. For example, given a BER of 10-3 the proposed system provides at least 1 dB gain in Eb/N, over the system using MC CDMA with multiuser detection and can accommodate at least 4 more users for a two transmit and 2 receive antenna case in a frequency selective Rayleigh fading channel |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-06-05 |
| 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) | KEIKYU, Japan; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |