DATE : 16th August 2019
TIME : 4 pm – 5pm
VENUE : ESB 244
SPEAKER : Abhijith Nambi S (EE15D207)
GUIDE : Dr. K. Giridhar
OFDM with index modulation (OFDM-IM) is an emerging communication technique where the manner in which a group of sub-carriers is chosen from a pool of the same conveys information, apart from the data symbols carried. For the same number of information bits conveyed, OFDM-IM is shown to have lower bit error rate (BER) when compared to conventional OFDM. There are a wide range of research proposals for this technique, which focus on different aspects like BER, spectral efficiency, PAPR, etc. Due to the inherent existence of inactive (silent) sub-carriers, to attain a higher spectral efficiency, conventional OFDM -IM requires higher order modulation, which can degrade its BER performance. In this seminar, a method to lower the modulation order so as to reduces the BER in OFDM-IM is described. The lowering is introduced without imposing any compromise on spectral efficiency. This lower order modulation aided approach can also be extended to the variants of OFDM-IM such as dual-mode OFDM-IM and in-phase\quadrature OFDM-IM. The performance improvement for OFDM-IM and its variants is quantified by theoretical and numerical results which reveal gains up to 4dB.