Blind channel estimation in MIMO for MC-CDMA | |
| Author | Rahim, Abdur |
| Call Number | AIT Thesis no.TC-05-4 |
| Subject(s) | MIMO systems Space time codes Code division multiple access Signal processing |
| 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 | For future wideband wireless networks, space diversity schemes relying on multiple antennas at the receiver and/or at the transmitter are very attractive to combat fadings and improve the transmission performance. Exploiting spatial diversity can increase the quality of transmission in MIMO systems. Space-time coding (STC) is an effective way to combat Rayleigh fading using multiple transmit antennas. Multicarrier transmission methods for CDMA communication systems have been proposed as an efficient technique to combat multipath propagation and to overcome the deficiencies in the performance of conventional CDMA over frequency-selective fading channel. The combination of MC-CDMA and STC techniques seems to offer a very promising ground for the research targeted for high data-rate communication systems. To achieve high-speed reliable communication systems while minimizing Mean Squared Error (MSE) of channel, blind channel estimation methods are often preferred. In this thesis, the channel has been estimated blindly using subspace-based algorithm for MC-CDMA technique combined with Space-Time Block Codes (STBC) in the case of MIMO system. Apart from the main simulation work with blind estimation techniques of channel, comparisons of Mean Square Error (MSE) and Bit Error Rate (BER) performances have been made also with those of the some existing systems under different scenarios. It is observed that for the MIMO channel of two transmit and two receive antenna of the proposed system with transmission efficiency of 1 bit/s/Hz, the BER degradation of channel estimation is about 2 dB compared to perfect channel. |
| 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) | Erke, Tapio J.;Rajatheva, R. M.A. P. |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |