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Problem Statement

Orthogonal Frequency Division Multiplexing (OFDM) is being currently used for modulating information in current 4G and 5G systems due to its ability to avoid inter symbol interference in wideband communication systems and also due to low complexity modulation and demodulation. However, when the mobile speed is very high (as in high speed trains and aircraft), the Doppler shift in the received signal results in inter-carrier interference which severely degrades the error probability performance. Properly designed OTFS modulation would definitely solve the problem of low reliability in aircraft communication systems. The main objective of this project is to therefore understand the wireless channel in the high speed aircraft scenario and design optimal OTFS modulation which guarantees reliable communication under the given communication time/bandwidth/transmit power constraints and the data rate requirements.

Objective of the project

The objective of this project is to design and develop Orthogonal Time Frequency Space (OTFS) modulation and demodulation modules for mobile wireless communication systems, where the mobile could be an aircraft travelling at speeds as high as v> 500 m/s (approximately 1.5 MAC) and L-Band carrier frequencies. The key requirements are, i) low error probability at very high mobile speed and ii) low complexity encoder/decoder implementation.