1 INTRODUCTION
2 COSMOLOGICAL SIGNALS & THEIR SIMULATION
2.1 HI Intensity Map Simulation
2.2 Optical Galaxy Catalogue Simulation
3 21CM FOREGROUNDS & THEIR SIMULATION
3.1 Galactic Synchrotron
3.2 Point Sources & Free-Free Emission
3.3 Simulated Observable Signal
4 FOREGROUND REMOVAL
4.1 FASTICA Formalism
4.2 FASTICA Results
5 HI × OPTICAL COSMOLOGY WITH FOREGROUNDS
5.1 Optical Redshift Uncertainty
5.2 Mitigating the Effects of FASTICA
6 CLUSTERING-BASED REDSHIFT ESTIMATION
6.1 HI Clustering Method
6.2 HI Clustering Results
7 SUMMARY & CONCLUSIONS