Joint Adaptive Modulation and Power Allocation for Variable-Rate Space-Time Block Codes
2008 (English)In: IEEE Communications Letters, ISSN 1089-7798, Vol. 12, no 1, 26-28 p.Article in journal (Refereed) Published
Variable-rate space-time block codes (vr-STBCs) without any feedback can support different transmission rates and unequal error protection (UEP) which are needed for multimedia communications. Assuming necessary feedback, in this letter, we introduce a joint adaptive modulation and power allocation (AMP) for vr-STBCs so as to maximize the total throughput under constraints of transmit power limit and error requirements. Based on a Lagrangian multiplier method, optimum modulation orders and power levels are provided for the transmitter. Numerical results show that the proposed AMP enhances the throughput of existing vr-STBCs up to 20% with very limited feedback, e.g., at most 3-5 bits feedback.
Place, publisher, year, edition, pages
2008. Vol. 12, no 1, 26-28 p.
space-time block code (STBC), variable-rate STBC, adaptive modulation, power allocation
Computer and Information Science
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-31051DOI: 10.1109/LCOMM.2008.071478ISI: 000252374700010OAI: oai:DiVA.org:kth-31051DiVA: diva2:402305
QC 201111172011-03-072011-03-072011-11-17Bibliographically approved