Performance analysis of a FDMA-TDMA based multi-user cooperative network over Rician and Nakagami fading channels | |
| Author | Khan, Imran |
| Call Number | AIT Diss. no.TC-10-02 |
| Subject(s) | Time division multiple access Wireless communication systems Radio--Transmitters and transmission--Fading |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering in Telecommunications, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. TC-10-02 |
| Abstract | This study presents an analysis on the performance of various cooperative network transmission protocols considering both fixed-relay and user cooperation scenarios. The relay nodes operate in amplify-and-forward (AF) and decode-and-forward (DF) modes. The channels are modeled as Rayleigh, Nakagami- m and Rician fading.Different trans- mission protocols and topologies are compared. We consider maximal ratio combining (MRC) at the destination to get the space diversity by adding the received signals co- herently. The performance of the system is analyzed by taking symbol error rate (SER), cooperation gain, capacity and outage probability into consideration. The closed form moment-generating function (MGF) for the total equivalent signal-to-noise ratio (SNR) is derived. The exact expressions of symbol error rate (SER), outage capacity and out- age probability are obtained using the closed-form MGF for single relay and multiple relay cooperative network with M -ary phase shift keying ( M -PSK) and M -ary quadra- ture amplitude modulation ( M -QAM). The cooperation gain is defined to quantify the benefits of cooperation. Number of cooperating relays are selected in order to ensure a cooperation gain greater than 1. The theoretical results are then compared with the simulation results obtained for binary phase shift keying ( B -PSK), quadrature phase shift keying ( Q -PSK) and 16-QAM modulation schemes to verify the analysis. The best relay(s) selection is done through fuzzy logic controller. Here the cooperation gain and the SNR are considered as Fuzzy Linguistic input variables. User cooperation provides the transmit diversity in wireless communications. Each user’s antenna serves as a relay for an other using an amplify-and-forward (AF) scheme. We consider hybrid frequency division multiple access-time division multiple access (FDMA-TDMA) cooperative protocol for transmission. We analyze the performance of coded cooperative diversity by obtaining the exact expression of symbol error rate (SER) over orthogonal Nakagami- m fading channel for M -PSK and M -QAM. In addition, we propose and evaluate a cooperative system based on bit-interleaved space-time coded modulation (BI-STCM) with the iterative decoding, referred as CO- BISTCM system. The space-time coded cooperative (STC-CO) and orthogonal space- time block coded cooperative (OSTBC-CO) protocols are proposed for the transmis- sion through user cooperation. An analytical approach is presented to evaluate the performance over frequency flat-fading. The closed-form MGF of the branch metric is derived. We derive an expression for bit-error rate (BER) of CO-BISTCM system using M -PSK. Finally, theoretical and simulation results are shown and they seem to agree well. |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. TC-10-02 |
| Type | Dissertation |
| 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 Mohiuddin;Poompat Saengudomlert;Guha, Sumanta;Latva-aho, Matti Sakari |
| Scholarship Donor(s) | NWFP University of Engineering and Technology Peshawar, Pakistan;NWFP University of Engineering and Technology Peshawar, Pakistan |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2010 |