Cooperative User Scheduling in Massive MIMO Systems

User Cooperation in Massive MIMO Systems with Cascaded Precoding

This paper investigates user cooperation in massive multiple-input multiple-output (MIMO) systems with cascaded precoding. The high-dimensional physical channel in massive MIMO systems can be converted into a low-dimensional effective channel through the inner precoder to reduce the overhead of channel estimation and feedback. The inner precoder depends on the spatial covariance matrix of the c...

A New Approach to User Scheduling in Massive Multi-User MIMO Broadcast Channels

In this paper, a new user-scheduling-and-beamforming method is proposed for multi-user massive multiple-input multiple-output (massive MIMO) broadcast channels in the context of two-stage beamforming. The key ideas of the proposed scheduling method are 1) to use a set of orthogonal reference beams and construct a double cone around each reference beam to select ‘nearly-optimal’ semi-orthogonal ...

Semi-Blind Channel Estimation based on subspace modeling for Multi-user Massive MIMO system

‎Channel estimation is an essential task to fully exploit the advantages of the massive MIMO systems‎. ‎In this paper‎, ‎we propose a semi-blind downlink channel estimation method for massive MIMO system‎. ‎We suggest a new modeling for the channel matrix subspace. Based on the low-rankness property, we have prposed an algorithm to estimate the channel matrix subspace. In the next step, using o...

Resource Allocation and User Scheduling in Coordinated Multicell MIMO Systems

Spatially Greedy Scheduling in Multi-user MIMO Wireless Systems

Absnocf-This paper considers the benefit of opportunistic channel state dependent scheduling in a multi-user MlMO wireless system. Channel state dependent scheduling can provide significant performance gains for wireless networks by exploiting the independence of fading statistics across the user population. While opportunistic schedulers typically pick the single “best” user for transmission, ...