Diversity selection in amplify-forward cooperative communication systems with TDMA-based protocols over fading channels | |
| Author | Gunawardena, Subodha Hettiachchi |
| Call Number | AIT Thesis no.TC-08-03 |
| Subject(s) | Time division multiple access Wireless communication systems MIMO systems |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Telecommunications, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. TC-08-03 |
| Abstract | Cooperative communication is an emerging area of wireless communications where the users in single input single output (SIS0) systems are communicated in a way that their antennas behave as a virtual multiple input multiple output (MIMO) system. Signaling of a cooperative communication session is governed by several basic protocols and cooperative relay terminals operate in two basic modes. Single and multiple relay systems have been discussed over the last few years and application of space time codes (STC) into cooperative communication is under research. However, multiple-relay systems suffer from their inherent drawbacks such as, requirement of higher system power and waste of transmission power over weaker channels. Hence, application of relay selection is studied so that the signals will be transmitted only over the better channels. Application of the Alamouti space time code into multiple relay environments using time division multiplexing (TDMA) based protocols is recently proposed by some authors and number of relay selection criteria has been developed to work with multiple relay environments. Considering these recent trends, relay selection criteria is proposed here to work with the Alamouti coding. This thesis analyzes a system with one user, one destination with multiple available relays operating over Rayleigh and Nakagami-m environments when the Alamouti code is transmitted. Formulas for moment generating function (MGF) and symbol error probability (SEP) are derived for the proposed relay selection criteria in which, the relay selection is based on maximum gain of source to relay channel or maximum gain of relay to destination channel. Simulation model for the above system is developed in Matlab environment and numerical results are obtained using Mathematica. Simulation and analytical results are compared to verify the accuracy of the derivations. Moreover, the proposed criteria are compared with the existing relay selection criteria as well as with the systems without relay selection. It is observed that above relay selection criteria outperform the existing criteria under some practical circumstances. |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. TC-08-03 |
| 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) | Ahmed, Kazi M.;Poompat Saengudomlert |
| Scholarship Donor(s) | Thailand (HM King),|eScholarship donor |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |