4 papers
Activity Detection in Distributed Massive MIMO With Pilot-Hopping and Activity Correlation
Ema Becirovic, Emil Björnson, Erik G. Larsson
Many real-world scenarios for massive machine-type communication involve sensors monitoring a physical phenomenon. As a consequence, the activity pattern of these sensors will be c…
Combining Reciprocity and CSI Feedback in MIMO Systems
Ema Becirovic, Emil Björnson, Erik G. Larsson
Reciprocity-based time-division duplex (TDD) Massive MIMO (multiple-input multiple-output) systems utilize channel estimates obtained in the uplink to perform precoding in the down…
Optimal MIMO Combining for Blind Federated Edge Learning with Gradient Sparsification
Ema Becirovic, Zheng Chen, Erik G. Larsson
We provide the optimal receive combining strategy for federated learning in multiple-input multiple-output (MIMO) systems. Our proposed algorithm allows the clients to perform indi…
Massive Machine Type Communication Pilot-Hopping Sequence Detection Architectures Based on Non-Negative Least Squares for Grant-Free Random Access
Narges Mohammadi Sarband, Ema Becirovic, Mattias Krysander +2
User activity detection in grant-free random access massive machine type communication (mMTC) using pilot-hopping sequences can be formulated as solving a non-negative least square…