Abstract
A low-complexity protocol is described and evaluated for adaptation of the modulation and coding for multicast transmission in half-duplex packet radio networks. The adaptive multicast transmission protocol is designed to compensate for changes in propagation conditions that occur from packet to packet during a session with one sender and multiple receivers. The protocol relies on simple receiver statistics to obtain the control information for adapting the modulation and coding, and it also provides scheduling to avoid collisions among acknowledgments from the receivers. The throughput provided by the protocol is compared with performance results for hypothetical ideal adaptive multicast transmission protocols that are given perfect channel state information. We illustrate the importance of adaptive modulation and channel coding in systems that employ fountain coding for packet erasure correction.








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Acknowledgments
This research was supported by the Army Research Office under Grant W911NF-11-1-0427, by the Office of Naval Research under Grant N00014-12-1-0060, and by the MIT Lincoln Laboratory. Parts of this article were presented at the 2010 IEEE Military Communications Conference.
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Appendix
Appendix
For the convenience of the reader, we list in Table 3 the values of endpoints that were adopted in [11] for the interval tests that are applied to the EC and IC. These values are used for the performance results in Sect. 9 The endpoints for the EC interval tests are γ1(EC) and γ2(EC), and those for the IC interval tests γ1(IC) and γ2(IC). The numerical values for the endpoints were chosen to give robust performance with respect to the channel parameters; they are not necessarily optimum for any particular channel. The abbreviations employed for the names of the protocols are summarized in Table 4. In Table 5, we list selected numerical values for the throughput curves of Figs. 3, 5, 6, and 7.
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Boyd, S.W., Ellis, J.D. & Pursley, M.B. Adaptive Coding and Modulation for Multicast Transmission in Packet Radio Networks. Int J Wireless Inf Networks 20, 103–119 (2013). https://doi.org/10.1007/s10776-013-0201-0
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DOI: https://doi.org/10.1007/s10776-013-0201-0