Joint Adaptive Modulation and Power Allocation for Variable-Rate Space-Time Block Codes

Author

Kim, Jung-Bin ; Kim, Dongwoo

Author_Institution

Hanyang Univ., Ansan

Volume

12

Issue

1

fYear

2008

fDate

1/1/2008 12:00:00 AM

Firstpage

26

Lastpage

28

Abstract

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.

Keywords

adaptive modulation; block codes; space-time codes; stochastic processes; Lagrangian multiplier method; error requirements constraint; joint adaptive modulation; multimedia communications; optimum modulation; optimum power levels; power allocation; transmit power limit constraijt; unequal error protection; variable-rate space-time block codes; Block codes; Error correction codes; Feedback; Lagrangian functions; Mobile communication; Modulation coding; Multimedia communication; Throughput; Transmitters; Transmitting antennas;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2008.071478

Filename

4432323