Channel-covariance and angle-of-departure aided hybrid precoding for wideband multiuser millimeter wave MIMO systems

Abstract

Hybrid precoding is essential for millimeter wave (mmWave) multiple-input multiple output (MIMO) systems due to its inherent advantage of a high gain, whilst alleviating the high cost of hardware. However, most of the existing literature considered either the narrowband or wideband single-user mmWave MIMO scenarios. Hence in this paper we focus our attention on the more challenging design of hybrid Transmit Precoding (TPC) for wideband multiuser mmWave MIMO systems by exploiting the long-term channel’s covariance matrix and the angle of departure (AoD) information. Specifically, in the analog TPC designed, we firstly derive the channel’s covariance matrix for each user. Then the analog TPC matrix having an infinite angle resolution is constructed based on the channel’s covariance matrix with the aid of phase extraction. Next, by exploiting the AoD information, we also propose a non-uniform quantization codebook based analog TPC having finite angle resolution. As for the design of the digital TPC, a three-stage scheme is proposed to compensate for the deleterious effects of beam squint, to cancel the inter-user interference and to attain multiplexing gains. We study the effects of various parameters on the achievable sum rate and demonstrate with the aid of our simulation results that the proposed hybrid TPC is capable of achieving a similar performance to the excessive-complexity fully digital TPC.

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Identifiers

ORCID for Lajos Hanzo: orcid.org/0000-0002-2636-5214

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