Degrees of freedom in adaptive modulation: a unified view

We examine adaptive modulation schemes for flat-fading channels where the data rate, transmit power, and instantaneous BER are varied to maximize spectral efficiency, subject to an average power and BER constraint. Both continuous-rate and discrete-rate adaptation are considered, as well as average...

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Vydané v:	IEEE transactions on communications Ročník 49; číslo 9; s. 1561 - 1571
Hlavní autori:	Seong Taek Chung, Goldsmith, A.J.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York IEEE 01.09.2001 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:	Adaptation Bit error rate Channel estimation Channels Constellation diagram Constraints Degrees of freedom Delay estimation Estimation error Fading Feedback Mathematical analysis Modulation Modulation coding Optimization Power system reliability Spectra Transmitters
ISSN:	0090-6778, 1558-0857
On-line prístup:	Získať plný text
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Abstract	We examine adaptive modulation schemes for flat-fading channels where the data rate, transmit power, and instantaneous BER are varied to maximize spectral efficiency, subject to an average power and BER constraint. Both continuous-rate and discrete-rate adaptation are considered, as well as average and instantaneous BER constraints. We find the general form of power, BER and data rate adaptation that maximizes spectral efficiency for a large class of modulation techniques and fading distributions. The optimal adaptation of these parameters is to increase the power and data rate and decrease the BER as the channel quality improves. Surprisingly, little spectral efficiency is lost when the power or rate is constrained to be constant. Hence, the spectral efficiency of adaptive modulation is relatively insensitive to which degrees of freedom are adapted.
AbstractList	We examine adaptive modulation schemes for flat-fading channels where the data rate, transmit power, and instantaneous BER are varied to maximize spectral efficiency, subject to an average power and BER constraint. Both continuous-rate and discrete-rate adaptation are considered, as well as average and instantaneous BER constraints. We find the general form of power, BER and data rate adaptation that maximizes spectral efficiency for a large class of modulation techniques and fading distributions. The optimal adaptation of these parameters is to increase the power and data rate and decrease the BER as the channel quality improves. Surprisingly, little spectral efficiency is lost when the power or rate is constrained to be constant. Hence, the spectral efficiency of adaptive modulation is relatively insensitive to which degrees of freedom are adapted We examine adaptive modulation schemes for flat-fading channels where the data rate, transmit power, and instantaneous BER are varied to maximize spectral efficiency, subject to an average power and BER constraint. Both continuous-rate and discrete-rate adaptation are considered, as well as average and instantaneous BER constraints. We find the general form of power, BER and data rate adaptation that maximizes spectral efficiency for a large class of modulation techniques and fading distributions. The optimal adaptation of these parameters is to increase the power and data rate and decrease the BER as the channel quality improves. Surprisingly, little spectral efficiency is lost when the power or rate is constrained to be constant. Hence, the spectral efficiency of adaptive modulation is relatively insensitive to which degrees of freedom are adapted.
Author	Seong Taek Chung Goldsmith, A.J.
Author_xml	– sequence: 1 surname: Seong Taek Chung fullname: Seong Taek Chung organization: Dept. of Electr. Eng., Stanford Univ., CA, USA – sequence: 2 givenname: A.J. surname: Goldsmith fullname: Goldsmith, A.J.
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Cites_doi	10.1109/26.771341 10.1109/26.634685 10.1109/TCOM.1972.1091106 10.1109/26.668727 10.1109/18.782125 10.1109/ICC.1997.610059 10.1109/VETEC.1995.504878 10.1109/26.886464 10.1109/TCOM.1986.1096558 10.1007/978-1-4684-1461-5 10.1109/18.771147 10.1109/26.392965 10.1109/VETEC.1996.503495 10.1109/18.641562
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Snippet	We examine adaptive modulation schemes for flat-fading channels where the data rate, transmit power, and instantaneous BER are varied to maximize spectral...
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SubjectTerms	Adaptation Bit error rate Channel estimation Channels Constellation diagram Constraints Degrees of freedom Delay estimation Estimation error Fading Feedback Mathematical analysis Modulation Modulation coding Optimization Power system reliability Spectra Transmitters
Title	Degrees of freedom in adaptive modulation: a unified view
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