Abstract
A vector perturbation (VP) scheme is proposed for the downlink of multi-user multiple input multiple output (MU-MIMO) systems with limited feedback. Instead of a computationally expensive sphere search used in conventional VP, the proposed scheme uses a MinMax Optimization to select the perturbation quantities. In addition, the proposed VP circumvents the need for receive-scaling by constraining the search of perturbing vectors to the area in the symbol constellation which is constrictive to the information symbols, i.e. the area where the distances from the decision thresholds are increased with respect to a distance threshold. Consequently, while conventional VP requires the feed-forwarding of the scaling factor to the receiver for correct detection, the proposed scheme does not require the scaling of the received symbols. This advantage is particularly pronounced in limited feedback scenarios where the scaling factors forwarded to the receiver are prone to quantization errors. As illustrated by the results, the error floor encountered in conventional VP in limited feedback scenarios is avoided in the proposed scheme.
Original language | English |
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Title of host publication | IEEE Global Communications Conference, GLOBECOM 2014 |
Publisher | IEEE |
Pages | 3349-3353 |
Number of pages | 5 |
ISBN (Print) | 978-1-4799-3512-3 |
DOIs | |
Publication status | Published - 2014 |
Event | 57th IEEE Global Communications Conference 2014 - Austin, United States Duration: 8 Dec 2014 → 12 Dec 2014 |
Conference
Conference | 57th IEEE Global Communications Conference 2014 |
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Abbreviated title | GLOBECOM 2014 |
Country/Territory | United States |
City | Austin |
Period | 8/12/14 → 12/12/14 |
Keywords
- limited feedback
- multiuser MIMO
- non-linear precoding
- Vector perturbation
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Computer Networks and Communications
- Communication