Performance analysis of cooperative networks : bit interleaved coded modulation with interative decoding and space time analog network coding over various fading environments | |
| Author | Tanoli, Shujaat Ali Khan |
| Call Number | AIT Diss no.TC-11-03 |
| Subject(s) | Coding theory Iterative methods (Mathematics) Wireless communication systems |
| 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-11-03 |
| Abstract | This dissertation mainly focuses on improving the performance of wideband wireless cooperative networks. To accomplish this goal, the focus of this study is broadly categorized in to two theme areas of research. The first research theme deals with the performance analysis of cooperative systems based on Bit-interleaved coded modulation with iterative decoding (BICMID) and Bit-interleaved low-density parity-check coded modulation with iterative decoding (BILDPCM-ID) respectively. The second research theme deals with an innovative scheme for bi-directional transmission based on Space Time Analog Network Coding (STANC) for wireless cooperative networks. The performance of the cooperative system is analyzed in terms of the parameters such as bit error rate (BER), symbol error rate (SER), cooperation gain, ergodic capacity and outage probability. The closed form moment-generating function (MGF) for the total equivalent signal-to-noise ratio (SNR) is derived. The theoretical expression of MGF for error free feedback bound (EF bound) is used to evaluate the BER of the system at medium and high SNR. The analysis is performed over different fading scenarios such as Rayleigh, Nakagami-m, and Rician fading. Significant amount of research att ention has been devoted to the field of relay coding in view of enhancing the performance and capacity of the system. In the first proposed research work, we analyze the single user serial concatenation of BICM-ID with single and multiple-relay based cooperative system. We exploit the code diversity through Bit-interleaved coded modulation (BICM) by effectively utilizing the hamming distance structure of binary codes. We address the downside of BICM (i.e. the reduced free Euclidean distance because of random modulation) through a simpler approach of iterative decoding (ID). We also present an innovative approach of bit-interleaved low-density parity-check coded modulation with iterative decoding (BILDPCM-ID) suitable for applications in cooperative systems. The main objectives of this research work are to enhance the performance of BICM and achieve reduced receiver complexity by using iterative decoding (BICM-ID) scheme along with hard decision feedback. ANC offers unique capacity-boosting advantage and improved throughput performance compared to its conventional counterparts such as direct transmissions and Digital Network Coding (DNC). ANC adopts a revolutionary approach, by encouraging interference of simultaneously transmitted signals which otherwise is considered harmful in wireless transmissions. In the second proposed research work, we present the novel extension of Analog Network Coding through Space-Time coding technique (STANC) to enhance the network capacity and coverage area, under multi hop and path loss scenario. The main objectives of this research work are to exploit the space diversity of cooperative networks by involving multiple relays and implement space time analog network coding based technique to achieve spatial diversity and improved throughput performance. We derive the closed-form expressions for moment generating function (MGF) of the equivalent signal-to-noise ratio (SNR) of the multiple-relay STANC network over independent and identically distributed (i.i.d) Rayleigh, Nakagami and Rician fading channels. Based on the moment generating function approach, we evaluate the performance of the system in terms of SER. STANC gain is evaluated using calculated SER to quantify the benefits of cooperation. Similarly, outage and capacity behavior are analytically analyzed under realistic propagation scenario. |
| Year | 2011 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. TC-11-03 |
| 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) | Poompat Saengudomlert ;Mongkol Ekpanyapong ;Latva-aho, Matti; |
| Scholarship Donor(s) | Higher Education Commission (HEC), Pakistan-AIT Fellowship ; |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2011 |