Title :
Energy efficiency of hybrid-ARQ systems under QoS constraints
Author :
Yi Li ; Ozcan, Gozde ; Gursoy, M. Cenk ; Velipasalar, Senem
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Syracuse Univ., Syracuse, NY, USA
Abstract :
In this paper, energy efficiency of hybrid automatic repeat request (HARQ) schemes under QoS constraints is studied in the low power regime by characterizing the minimum energy per bit and wideband slope. The energy efficiency is investigated when either an outage constraint is imposed and (the transmission rate is selected accordingly) or the transmission rate is optimized to maximize the throughput. In both cases, it is also assumed that there is a limitation on the number of retransmissions due to deadline constraints. Under these assumptions, closed-form expressions are obtained for the minimum energy per bit and wideband slope for HARQ with chase combining (CC). Through numerical results, the performances of HARQ-CC and HARQ with incremental redundancy (IR) are compared. Moreover, the impact of deadline constraints, outage probability, QoS constraints on the energy efficiency is analyzed.
Keywords :
automatic repeat request; energy conservation; quality of service; telecommunication power management; CC; HARQ systems; IR; QoS constraints; chase combining; closed-form expressions; deadline constraints; energy efficiency; hybrid automatic repeat request scheme; incremental redundancy; minimum energy per bit characterization; outage probability; transmission rate; wideband slope; Lead; Numerical models; Quality of service; Signal to noise ratio; Chase combining; QoS constraints; energy efficiency; hybrid ARQ; incremental redundancy; minimum energy per bit; wideband slope;
Conference_Titel :
Information Sciences and Systems (CISS), 2014 48th Annual Conference on
Conference_Location :
Princeton, NJ
DOI :
10.1109/CISS.2014.6814121
