Variable rate and variable power MQAM system based on bayesian bit error rate and channel estimation techniques.pdf (290.83 kB)
Variable rate and variable power MQAM system based on Bayesian bit error rate and channel estimation techniques
journal contribution
posted on 2010-01-05, 16:28 authored by Lay Teen Ong, Mohammad Shikh-Bahaei, Jonathon ChambersThe impact of inaccurate channel state information
at the transmitter for a variable rate variable power multilevel
quadrature amplitude modulation (VRVP-MQAM) system over
a Rayleigh flat-fading channel is investigated. A system model
is proposed with rate and power adaptation based on the
estimates of instantaneous signal-to-noise ratio (SNR) and bit
error rate (BER). A pilot symbol assisted modulation scheme is
used for SNR estimation. The BER estimator is derived using a
maximum a posteriori approach and a simplified closed-form
solution is obtained as a function of only the second order
statistical characterization of the channel state imperfection.
Based on the proposed system model, rate and power adaptation
is derived for the optimization of spectral efficiency subject
to an average power constraint and an instantaneous BER
requirement. The performance of the VRVP-MQAM system
under imperfect channel state information (CSI) is evaluated.
We show that the proposed VRVP-MQAM system that employs
optimal solutions based on the statistical characterization of CSI
imperfection achieves a higher spectral efficiency as compared
to an ideal CSI assumption based method.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Citation
ONG, L.T., SHIKH-BAHAEI, M. and CHAMBERS, J., 2008. Variable rate and variable power MQAM system based on Bayesian bit error rate and channel estimation techniques. IEEE Transactions on Communications, 56 (2), pp. 177-182.Publisher
© IEEEVersion
- VoR (Version of Record)
Publication date
2008Notes
This article was published in the journal IEEE Transactions on Communications [© IEEE] and is also available at: http://ieeexplore.ieee.org/. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.ISSN
0090-6778Language
- en