Ecole d'ingénieur et centre de recherche en télécommunications

Variable-rate coding for slowly fading gaussian multiple-access channels

Caire, Giuseppe;Tuninetti, Daniela;Verdu, Sergio

IEEE Transactions on Information Theory, Volume 50, N°10, October 2004

We consider a nonergodic multiple-access Gaussian block-fading channel where a fixed number of independent and identically distributed (i.i.d.) fading coefficients affect each codeword. Variable-rate coding with input power constraint enforced on a per-codeword basis is examined. A centralized power and rate allocation policy is determined as a function of the previous and present fading coefficients. The power control policy that optimizes the expected rates is obtained through dynamic programming and the average capacity region and the average capacity region per unit energy are characterized. Moreover, we study the slope of spectral efficiency curve versus$ E_b/N_0 $(dB), and we quantify the penalty incurred by time-division multiple access (TDMA) over superposition coding in the low-power regime.

Document Doi Bibtex

Titre:Variable-rate coding for slowly fading gaussian multiple-access channels
Mots Clés:Block-fading channels;causal channel state information;channel capacity;low-power regime;multiple-access channels (MACs);power control
Département:Systèmes de Communication
Eurecom ref:1527
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Bibtex: @article{EURECOM+1527, doi = {}, year = {2004}, month = {10}, title = {{V}ariable-rate coding for slowly fading gaussian multiple-access channels}, author = {{C}aire, {G}iuseppe and {T}uninetti, {D}aniela and {V}erdu, {S}ergio}, journal = {{IEEE} {T}ransactions on {I}nformation {T}heory, {V}olume 50, {N}°10, {O}ctober 2004}, url = {} }
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