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Performance analysis of adaptive limited feedback coordinated zero-forcing multicell systems in time-varying channels: A practical approach
Published in Wiley
2017
Volume: 30
   
Issue: 14
Abstract

In this paper, coordinated limited feedback zero-forcing beamforming multicell system in time-varying channel is studied. In time-varying channels, the actual rate loss arising from error in channel quantization of both interuser and intercell inferences is quantified in this work. Using the actual degradation of rate loss, a limited feedback bit allocation is proposed to reduce interuser and intercell interference simultaneously with feedback update period as one of the parameters. Furthermore, the scaling law of bits required to maintain a constant rate loss is formulated in varying channel conditions for a given feedback update period. Simulation results demonstrated the practical feedback requirement in multicell systems in the presence of both intercell and interuser interference over conventional schemes to maintain a constant rate offset. The key finding from the proposed feedback allocation is that practically much higher allocation of feedback bits and feedback scaling are required in time-varying channels to reduce throughput degradation.

About the journal
JournalData powered by TypesetInternational Journal of Communication Systems
PublisherData powered by TypesetWiley
ISSN1074-5351
Open AccessNo