Courses Taught - Multiuser Detection

E2-242: Multiuser Detection (Jan-Apr)

Course Content

Introdution - Direct-sequence spread spectrum (DS-SS), multiple access (TDMA, FDMA, CDMA), DS code division multiple access (DS-CDMA), DS-CDMA system capacity, near-far effect in DS-CDMA.
Multiuser detection in DS-CDMA – MF detector, decorrelating/zero-forcing detector, MMSE detector. Successive interference canceller (SIC), parallel interference canceller (PIC), linear PlC. Performance analysis of multiuser detectors and interference cancellers.
Low-complexity detectors for large MIMO systems. Channel hardening in large MIMO systems. Multiuser/MIMO detection using likelihood ascent search (LAS), reactive tabu search (RTS), belief propagation (BP)/message passing (MP), probabilistic data association (PDA).
OTFS modulation for high-mobility communications: Linear time-varying (LTV) channel characterization/representation. Modulation in the delay-Doppler (DD) domain in LTV channels.
Zak-OTFS: Zak transform, quasi-periodicity, inverse Zak transform, DD domain pulse, time domain representation of a DD pulse (pulsone), twisted convolution of DD domain functions.
Zak-OTFS transceiver: DD domain pulse shaping filters, DD domain aliasing, crystalline regime of operation, end-to-end input/output (I/O) relation, linear vector channel model for Zak-OTFS, estimation of I/O relation (model-dependent approach, model-free approach), Zak-OTFS signal detection.

Text Books / Reference Material

A. Chockalingam and B. Sundar Rajan, Large MIMO Systems, Cambridge University Press, 2014.

F. Hlawatsch and G. Matz, Wireless Communications Over Rapidly Time-Varying Channels, Academic Press, 2011.

S. K. Mohammed, R. Hadani, and A. Chockalingam, OTFS Modulation - Theory and Applications, IEEE Press-Wiley, 2024.