Hybrid Precoding for Physical Layer Multicasting

This work investigates the problem of downlink transmit precoding for physical layer multicasting with a limited number of radio-frequency (RF) chains. To tackle the RF hardware constraint, we consider a hybrid precoder that is partitioned into a high-dimensional RF precoder and a low-dimensional ba...

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Veröffentlicht in:IEEE communications letters Jg. 20; H. 2; S. 228 - 231
Hauptverfasser: Dai, Mingbo, Clerckx, Bruno
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.02.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithm design and analysis
Complexity theory
Hybrid precoding
Limited RF chains
Low complexity algorithm
MIMO
Multicast communication
Multicasting
Optimization
Radio frequency
Signal to noise ratio
low complexity algorithm
Multicasting
hybrid precoding
limited RF chains
ISSN:1089-7798, 1558-2558
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Beschreibung
Zusammenfassung:This work investigates the problem of downlink transmit precoding for physical layer multicasting with a limited number of radio-frequency (RF) chains. To tackle the RF hardware constraint, we consider a hybrid precoder that is partitioned into a high-dimensional RF precoder and a low-dimensional baseband precoder. Considering a total transmit power constraint over the RF chains, the goal is to maximize the minimum (max-min) received signal-to-noise ratio (SNR) among all users. We propose a low complexity algorithm to compute the RF precoder that achieves near-optimal max-min performance. Moreover, we derive a simple condition under which the hybrid precoding driven by a limited number of RF chains incurs no loss of optimality with respect to the fully digital precoding case. Finally, numerical results validate the effectiveness of the proposed algorithm and theoretical findings.
Bibliographie:ObjectType-Article-1
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2015.2503273