Multilevel Polar Coded-Modulation for Wireless Communications
Hossein Khoshnevis · 2018
In wireless channels, the signal quality degrades mainly due to the additive noise and the random variation of attenuation of the signal, known as fading.The additive noise can be compensated to some extent using forward error correction (FEC) coding and automatic repeat request (ARQ).The fading can be compensated not only with FEC codes and ARQ schemes but also using spatial diversity and multiplexing achieved by employing multiple antenna systems, known as multiple-input multiple-output (MIMO) systems.MIMO schemes fall into different categories based on system requirements, e.g., space-time block codes (STBCs) and limited feedback schemes.FEC codes, as a method of substantial performance improvement, are employed in most modern communication systems.However, the optimal design of the concatenation of FEC codes and modulation schemes for different applications is an open problem.Polar codes are a new class of FEC codes that benefit from simple rate matching and a variety of low-complexity decoders which facilitate the design of efficient systems.Multilevel coding with multistage decoding (MLC/MSD) is a low-complexity capacity achieving coded-modulation technique that can be designed efficiently for polar codes due to the conceptual similarity.In this thesis, in order to achieve low-arithmetic-complexity/high-performance coded-modulation schemes for wireless channels, multilevel polar coded-modulation First and foremost, I want to thank my co-supervisors Professor Halim Yanikomeroglu and Professor Ian Marsland.I am thankful to Professor Yanikomeroglu for the encouragement and the endless support throughout my Ph.D. studies.His advice on both research as well as on my career have been invaluable.I would also like to appreciate Professor Marsland for the enormous contribution of time and ideas to increase the productivity of my thesis.During my studies, we had numerous meetings and discussions on a variety of research issues; throughout them, he has taught me many aspects of communication systems.Completing my Ph.D. would have been difficult without his excellent support and patience.