Computer Science – Information Theory
Scientific paper
2006-10-17
Computer Science
Information Theory
24 pages, 6 figures, submitted to IEEE Transactions on Wireless Communications
Scientific paper
A cross-layer optimization approach is adopted for the design of symmetric random access wireless systems. Instead of the traditional collision model, a more realistic physical layer model is considered. Based on this model, an Incremental Redundancy Automatic Repeat reQuest (IR-ARQ) scheme, tailored to jointly combat the effects of collisions, multi-path fading, and additive noise, is developed. The Diversity-Multiplexing-Delay tradeoff (DMDT) of the proposed scheme is analyzed for fully-loaded queues, and compared with that of Gallager tree algorithm for collision resolution and the network-assisted diversity multiple access (NDMA) protocol of Tsatsanis et al.. The fully-loaded queue model is then replaced by one with random arrivals, under which these protocols are compared in terms of the stability region, average delay and diversity gain. Overall, our analytical and numerical results establish the superiority of the proposed IR-ARQ scheme and reveal some important insights. For example, it turns out that the performance is optimized, for a given total throughput, by maximizing the probability that a certain user sends a new packet and minimizing the transmission rate employed by each user.
Gamal Hesham El
Gopala Praveen Kumar
Nam Young-Han
No associations
LandOfFree
ARQ Diversity in Fading Random Access Channels does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ARQ Diversity in Fading Random Access Channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ARQ Diversity in Fading Random Access Channels will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-99403