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In this work, we study the application of Ultra-Wide Band (UWB) Tightly Coupled Dipole Array (TCDA) to support multi-band cellular base stations. The benefits of TCDA to such applications and some system concepts to enable such applications are discussed. The design is carried out and simulated fully in Ansys HFSS software. Its performance is examined against the requirements of cellular base station antennas and found to be promising. This design is capable of supporting 700MHz, 1.7GHz, and 2.6GHz bands simultaneously with ±60° scanning in the diagonal plane (D-plane). A physical prototype is being built and the measurement results are to be disclosed at the conference.

In 3D massive MIMO (multiple-input multiple-output) systems, especially in time division duplex (TDD) mode, a base station (BS) relies on the uplink sounding signals from mobile stations to obtain the spatial information for downlink MIMO processing. Accordingly, multi-dimensional parameter estimation of MIMO channel becomes crucial for such systems to realize the predicted capacity gains. In this paper, we study the joint estimation of elevation and azimuth angles as well as the delay parameters for 3D massive MIMO orthogonal frequency division multiplexing (OFDM) systems under a parametric channel modeling. To be specific, we introduce a matrix-based joint parameter estimation method, and analytically characterize its performance for massive MIMO OFDM systems. Results show that antenna array configuration at the BS plays a critical role in determining the underlying channel estimation performance, and the characterized MSEs match well with the simulated ones. Also, the parametric channel estimation outperforms the MMSE-based channel estimation in terms of the correlation between the estimated channel and the real channel.