The field of multiple-input multiple-output (MIMO) channel estimation and antenna systems is witnessing significant advancements. Researchers are exploring innovative methods to improve the accuracy and efficiency of channel estimation, such as joint carrier frequency offset and channel estimation, and distributed MIMO with over-the-air phase calibration. Additionally, there is a growing interest in pinching-antenna systems, which offer flexible deployment and optimized energy-rate performance. Noteworthy papers in this area include: On the Resilience of Direction-Shift Keying Against Phase Noise and Short Channel Coherence Time at mmWave Frequencies, which derives the structure of the optimal detector for Direction-Shift Keying and establishes the governing law for its coherence time. Study of Iterative Detection, Decoding and Channel Estimation for RIS-Aided MIMO Networks, which proposes an iterative detection, decoding and channel estimation scheme for multiple-antenna systems assisted by multiple reflective intelligent surfaces.