QoS constrained power minimization in the multiple stream MIMO broadcast channel

•Multi-Stream MIMO BC under imperfect CSI and subject to per-user QoS constraints is addressed.•Average per-stream MMSE-based restrictions have to be employed to ensure the QoS requirements.•Filters and virtual per-stream rate targets are jointly designed considering only statistical CSI.•Impact of...

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Bibliographic Details
Published in:Signal processing 2018-02, Vol.143, p.48-55
Main Authors: González-Coma, José P., Joham, Michael, Castro, Paula M., Castedo, Luis
Format: Article
Language:English
Subjects:
Broadcast channel
Imperfect CSI
Multiple stream
Multiple-Input Single-Output
QoS constraints
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Summary:•Multi-Stream MIMO BC under imperfect CSI and subject to per-user QoS constraints is addressed.•Average per-stream MMSE-based restrictions have to be employed to ensure the QoS requirements.•Filters and virtual per-stream rate targets are jointly designed considering only statistical CSI.•Impact of CSI uncertainty on system performance is studied. This work addresses the design of optimal linear transmit filters for the Multiple Input-Multiple Output (MIMO) Broadcast Channel (BC) when several spatial streams are allocated to each user. We further consider that the Channel State Information (CSI) is perfect at the receivers but is only partial at the transmitter. A statistical model for the partial CSI is assumed and exploited for the filter design. The relationship between average rate and average Mean Square Error (MSE) is studied to determine the optimal way to distribute the per-user rates among the streams. Finally, the feasible average sum-MSE (sMSE) region is studied and the impact of the CSI uncertainty over the overall system performance is evaluated.
ISSN:0165-1684
1872-7557
DOI:10.1016/j.sigpro.2017.08.015