Adaptive Rate Control for Multi-Antenna Multicast in OFDM Systems


We propose two rate control schemes for multi-antenna multicast in OFDM systems, which aim to maximize the minimum average rate over all users in a multicast group. In our system, we do not require all multicast users to successfully recover the signals received on each subcarrier. In contrast, we allow certain loss for multicast users, such that the multicast transmission rate can be increased. We assume that the loss-repairing can be completed at upper protocol layers via advanced fountain codes. Following this principle, we formulate the rate control problem via beamforming in multi-antenna multicast to optimize the minimum achievable rate for all multicast users. While the computation complexity to solve for the optimal beamformer is prohibitively high, we propose a suboptimal iterative rate control scheme. Moreover, we modify the above optimization problem by selecting a ?xed proportion of users on each subcarrier. The beamformer searching process will then be performed only based on the selected users on each subcarrier, such that the complexity can be further reduced. We also solve this new problem with a low complexity approach. Theoretical analyses and simulation results show that our proposed two rate control schemes can have higher minimum average rate than the baseline scheme without rate control, while achieving low complexity.

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Du, Q. , Ren, P. , Jia, Y. and Chen, Z. (2013) Adaptive Rate Control for Multi-Antenna Multicast in OFDM Systems. Communications and Network, 5, 150-155. doi: 10.4236/cn.2013.53B2029.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] F. Hartung, U. Horn, J. Huschke, M. Kampmann, T. Lohmar and M.Lundevall, “Delivery of Broadcast Services in 3G Networks,” IEEE Transactions Broadcasting, Vol. 53, No. 1, 2007, pp. 188-199. doi:10.1109/TBC.2007.891711
[2] Q. Du and X. Zhang, “Statistical QoS Provisionings for Wireless Unicast/Multicast of Multi-Layer Video Streams,” IEEE Journal of Selected Areas in Communications, Vol. 28, No. 3, 2010, pp. 420-433. doi:10.1109/JSAC.2010.100413
[3] N. Jindal and Z.-Q. Luo, “Capacity Limits of Multiple Antenna Multicast,” in Proc. IEEE International Symposium on Information Theory, Seattle, USA, 2006, pp. 1841-1845.
[4] P. K. Gopala and H. E. Gamal, “Opportunistic Multicasting,” in Proc. IEEE Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, 2004, pp. 845-849.
[5] Gopala, Praveen Kumar; El Gamal, H., “On the Throughput-delay Tradeoff in Cellular Multicast,” in Proc. International Conference on Wireless Networks, Communications and Mobile Computing, Maui, Hi, 2005, pp. 1401-1406.
[6] M. Luby, M. Watson, T. Gasiba, T. Stockhammer and W. Xu, “Raptor Codes for Reliable Download Delivery in Wireless Broadcast Systems,” in Proc. the 3rd IEEE Consumer Communications and Networking Conference, Las Vegas, NV, Jan. 2006, pp. 192-197.
[7] fD. J. C. MacKay, “Fountain Codes,” IEEE Proceedings-Communications, Vol. 152, 2005, pp. 1062- 1068.
[8] T.-P. Low, M. on Pun, Y.-W. Hong and C.-C. Kuo, “Optimized Opportunistic Multicast Scheduling (oms) over Wireless Cellular Networks,” IEEE Transactions Wireless Communications, Vol. 9, No. 2, 2010, pp. 791-801.
[9] Q. Le-Dang, T. Le-Ngoc and Q. Ho, “Opportunistic Multicast Scheduling with Erasure-Correction Coding over Wireless Channels,” in proc. IEEE ICC 2010, Cape Town, South Africa, 2010, pp. 1-5.
[10] Q. Qu and U. Kozat, “On the Opportunistic Multicasting in Ofdm-based Cellular Networks,” in proc. IEEE ICC 2008, Beijing, China, 2008, pp. 3708-3714.
[11] L. Tian, D. Pang, Y. B. Yang and D. Eryk, “Subcarrier Allocation for Multicast Services in Multicarrier Wireless Systems with QoS Guarantees,” in Proc. IEEE WCNC 2010, Sydney, Australia, 2010, pp. 1-6.
[12] U. C. Kozat, “On the Throughput Capacity of Opportunistic Multicasting with Erasure Codes,” in Proc. IEEE INFOCOM, Phoenix, AZ, May 2008, pp. 520-528.
[13] W. Huang and K. L. Yeung, “On Maximizing the Throughput of Opportunistic Multicast in Wireless Cellular Networks with Erasure Codes,” in Proc. IEEE ICC 2011, Kyoto, Japan, Jun. 2011, pp. 1-5.
[14] K. Bakanoglu, M. Wu, H. Liu and M. Saurabh, “Adaptive Resource Allocation in Multicast OFDMA Systems,” in Proc. IEEE WCNC 2010, Sydney, Australia, 2010, pp.1-6.
[15] N. Sidiropoulos, T. David-son and Z.-Q. Luo, “Transmit Beamforming for Physical-layer Multicasting,” IEEE Transactions Signal Process., Vol. 54, No. 6, 2006, pp. 2239-2251. doi:10.1109/TSP.2006.872578
[16] J. Xu, S. Lee, W. Kang and J. Seo, “Adaptive Resource Allocation for MI-MO-OFDM Based Wireless Multicast Systems,” IEEE Trans. BROADCASTING, Vol. 56, No. 1, 2010, pp. 98-102. doi:10.1109/TBC.2009.2039691

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