Energy-efficient TDMA with quantized channel state information

Antonio G. Marques, Xin Wang, Georgios B. Giannakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We deal with energy efficient time-division multiple access (TDMA) over fading channels with finite-rate feedback in the power-limited regime. Through finite-rate feedback from the access point, users acquire quantized channel state information. The goal is to map channel quantization states to adaptive modulation and coding (AMC) modes and allocate optimally time slots to users so that transmit-power is minimized. To this end, we develop two joint quantization and resource allocation approaches. In the first one, we rely on the quantization regions associated to each AMC mode and the time allocation policy inherited from the perfect CSI case to optimize the fixed transmit-power across quantization states. In the second approach, we pursue separable optimization and resort to coordinate descent algorithms to solve the following two sub-problems: (a) given a time allocation, we optimize the quantization regions and transmit-powers; and (b) with improved quantization regions, we optimize the time allocation policy. Numerical results are present to evaluate the energy savings and compare the novel approaches.

Original languageEnglish (US)
Title of host publicationMilitary Communications Conference 2006, MILCOM 2006
StatePublished - 2007
EventMilitary Communications Conference 2006, MILCOM 2006 - Washington, D.C., United States
Duration: Oct 23 2006Oct 25 2006

Publication series

NameProceedings - IEEE Military Communications Conference MILCOM


OtherMilitary Communications Conference 2006, MILCOM 2006
Country/TerritoryUnited States
CityWashington, D.C.


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