Massive hybrid antenna array for millimeter-wave cellular communications


A large hybrid array consists of multiple analog subarrays, with each subarray having its digital processing chain. It offers the potential advantage of balancing value and performance for massive arrays and therefore is an attractive answer for future millimeter-wave (mm- Wave) cellular communications. On one hand, using beamforming analog subarrays like phased arrays, the hybrid configuration can effectively collect or distribute signal energy in sparse mm-Wave channels. On the opposite hand, multiple digital chains within the configuration offer multiplexing capability and more beamforming flexibility to the system. In this article, we have a tendency to discuss many important issues and therefore the state-of-the-art development for mm-Wave hybrid arrays, like channel modeling, capacity characterization, applications of varied smart antenna techniques for single-user and multiuser communications, and practical hardware style. We tend to investigate how the hybrid array design and special mm-Wave channel property will be exploited to design suboptimal but practical massive antenna array schemes. We also compare two main types of hybrid arrays, interleaved and localized arrays, and advocate that the localized array could be a better choice in terms of overall performance and hardware feasibility.

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