A Survey of Intelligent Methods Under Inadequate Pilots in 5G/6G MIMO Systems: Pilot-Domain Mitigation, Channel Estimation, and Receiver Processing
In large-scale multiple-input multiple-output (MIMO) systems, inadequate pilots can necessitate pilot reuse, reducing channel-estimation accuracy, while too few received pilot observations can also lead to inaccurate interference-plus-noise covariance estimates. These estimation errors can further degrade the performan...