DAGSurv: Directed Acyclic Graph Based Survival Analysis Using Deep Neural Networks

1 code implementation • 2 Nov 2021 • Ansh Kumar Sharma, Rahul Kukreja, Ranjitha Prasad, Shilpa Rao

Causal structures for observational survival data provide crucial information regarding the relationships between covariates and time-to-event.

Survival Analysis Survival Prediction +1

Cell-Free Massive MIMO with Nonorthogonal Pilots for Internet of Things

no code implementations • 18 Jun 2020 • Shilpa Rao, Alexei Ashikhmin, Hong Yang

Simulation results show a 40% improvement in uplink and downlink throughputs and 95% in energy efficiency over existing cell-free wireless systems and at least a three-fold uplink improvement over known IoT systems based on small-cell systems.

Massive MIMO Channel Estimation with Low-Resolution Spatial Sigma-Delta ADCs

no code implementations • 15 May 2020 • Shilpa Rao, Gonzalo Seco-Granados, Hessam Pirzadeh, Josef A. Nossek, A. Lee Swindlehurst

We consider channel estimation for an uplink massive multiple-input multiple-output (MIMO) system where the base station (BS) uses an array with low-resolution (1-2 bit) analog-to-digital converters and a spatial Sigma-Delta ($\Sigma\Delta$) architecture to shape the quantization noise away from users in some angular sector.

Quantization