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Millimeter wave (mm-wave) communication with large-scale antenna arrayconfiguration is seen as the key enabler of the next generation communicationsystems. Accurate knowledge of the mm-wave propagation channels is fundamentaland essential. In this contribution, a novel complexity-efficient highresolution parameter estimation (HRPE) algorithm is proposed for the mm-wavechannel with large-scale uniform circular array (UCA) applied. The proposedalgorithm is able to obtain the high-resolution estimation results of thespherical channel propagation parameters. The prior channel information in thedelay domain, i.e., the delay trajectories of individual propagation pathsobserved across the array elements, is exploited, by combining thehigh-resolution estimation principle and the phase mode excitation technique.Fast initializations, effective interference cancellations and reducedsearching spaces achieved by the proposed schemes significantly decrease thealgorithm complexity. Furthermore, the channel spatial non-stationarity in pathgain across the array elements is considered for the first time in theliterature for propagation parameter estimation, which is beneficial to obtainmore realistic results as well as to decrease the complexity. A mm-wavemeasurement campaign at the frequency band of 28-30 GHz using a large-scale UCAis exploited to demonstrate and validate the proposed HRPE algorithm.

A Complexity-Efficient High Resolution Propagation Parameter Estimation Algorithm for Ultra-Wideband Large-Scale Uniform Circular Array