A two-timescale scheme exploits shared and independent scatterers among users to reuse pilots and jointly estimate channels, scatterers, and user positions.
Scaling up MIMO: Opportunities and challenges with very large arrays,
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Scattering Environment Aware Joint Multi-user Channel Estimation and Localization with Spatially Reused Pilots
A two-timescale scheme exploits shared and independent scatterers among users to reuse pilots and jointly estimate channels, scatterers, and user positions.