Title :
Rate Selection Algorithms for IR Hybrid ARQ
Author :
Gopalakrishnan, Nandu ; Gelfand, Saul
Author_Institution :
Alcatel-Lucent Inc., Whippany, NJ
Abstract :
We obtain throughput expressions for an incremental redundancy (IR) hybrid ARQ (HARQ) system given delayed channel mutual information feedback using renewal process theory. We obtain the optimal rate selection algorithm for conditional throughput under a conditional outage constraint (due to finite horizon operation) in a single user scheduled per slot (non-adaptive) scenario. We compare performance with commonly employed other rate adaptation algorithms. We characterize the HARQ gain (and its components of time diversity and early termination) improving epsiv-outage capacity and study the impact of feedback and opportunistic scheduling at various mobile speeds.
Keywords :
automatic repeat request; mobile computing; scheduling; telecommunication channels; automatic repeat request; delayed channel; hybrid ARQ; incremental redundancy; mobile speed; mutual information feedback; optimal rate selection; outage capacity; renewal process theory; scheduling; Automatic repeat request; Constraint optimization; Delay effects; Diversity reception; Fading; Feedback; Mutual information; Protocols; Quality of service; Throughput;
Conference_Titel :
Sarnoff Symposium, 2008 IEEE
Conference_Location :
Princeton, NJ
Print_ISBN :
978-1-4244-1843-5
DOI :
10.1109/SARNOF.2008.4520072
