@article{b5e560b8bedc43649af465588366a0fc,

title = "Fundamental limits and scaling behavior of cooperative multicasting in wireless networks",

abstract = "A framework is developed for analyzing capacity gains from user cooperation in slow-fading wireless networks when the number of nodes (network size) is large. The framework is illustrated for the case of a simple multipath-rich Rayleigh-fading channel model. Both unicasting (one source and one destination) and multicasting (one source and several destinations) scenarios are considered. We introduce a meaningful notion of Shannon capacity for such systems, evaluate this capacity as a function of signal-to-noise ratio (SNR), and develop a simple two-phase cooperative network protocol that achieves it. We observe that the resulting capacity is the same for both unicasting and multicasting, but show that the network size required to achieve any target error probability is smaller for unicasting than for multicasting. Finally, we introduce the notion of a network {"}scaling exponent{"} to quantify the rate of decay of error probability with network size as a function of the targeted fraction of the capacity. This exponent provides additional insights to system designers by enabling a finer grain comparison of candidate cooperative transmission protocols in even moderately sized networks.",

keywords = "Ad hoc networks, Cooperative diversity, Multicasting, Outage capacity, Scaling laws, Sensor networks, Wireless networking",

author = "Ashish Khisti and Uri Erez and Wornell, {Gregory W.}",

note = "Funding Information: Manuscript received March 14, 2005; revised November 29, 2005. This work was supported in part by the National Science Foundation under Grant CNS-0434974, by Hewlett-Packard through the MIT/HP Alliance, and by NEC Corporation. The material in this correspondence was presented in part at the 2004 Allerton Conference on Communication, Control and Computing, Monticello, IL, September 2004.",

year = "2006",

month = jun,

doi = "10.1109/TIT.2006.874541",

language = "אנגלית",

volume = "52",

pages = "2762--2770",

journal = "IEEE Transactions on Information Theory",

issn = "0018-9448",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "6",

}