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Understanding the Impact of Interference on Collaborative Relays
June 2008 (vol. 7 no. 6)
pp. 724-736
Collaborative relays achieve the benefits of spatial diversity without requiring any physical antenna arrays at wireless devices. While many studies have demonstrated its effectiveness in a single source-destination system, applying cooperative relays to large-scale wireless networks remains challenging. We show that a system with cooperative relays can be penalized by the extra level of interference it produces. By examining the inter-dependency between interference management and cooperative relay strategies, we model the penalty by an increase in spectrum resource usage, and translate it into a penalty of single-link performance. This penalty serves as a reference for cooperative relay design in a single-link scenario. We then present two practical spectrum allocation mechanisms for collaborative relay systems with different fairness and utilization tradeoffs. Simulation results confirm our analytically findings.

[1] S.S. Barbarossa et al., “Cooperative Wireless Networks Based onDistributed Space-Time Coding,” Proc. Int'l Workshop Wireless Ad-Hoc Networks (IWWAN '04), June 2004.
[2] J.N. Laneman, D.N.C. Tse, and G.W. Wornell, “Cooperative Diversity in Wireless Networks: Efficient Protocols and Outage Behavior,” IEEE Trans. Information Theory, vol. 50, no. 12, pp.3062-3080, Dec. 2004.
[3] A. Sendonaris, E. Erkip, and B. Aazhang, “User Cooperation Diversity. Part II: Implementation Aspects and Performance Analysis,” IEEE Trans. Comm., vol. 51, no. 11, pp. 1939-1948, Nov. 2003.
[4] A. Høst-Madsen and J. Zhang, “Capacity Bounds and Power Allocation for Wireless Relay Channels,” IEEE Trans. Information Theory, vol. 51, no. 6, pp. 2020-2040, June 2005.
[5] G. Kramer, M. Gastpar, and P. Gupta, “Cooperative Strategies and Capacity Theorems for Relay Networks,” IEEE Trans. Information Theory, vol. 51, no. 9, pp. 3037-3063, Sept. 2005.
[6] K. Azarian, H.E. Gamal, and P. Schniter, “On the Achievable Diversity-Multiplex Tradeoff in Half-Duplex Cooperative Channels,” IEEE Trans. Information Theory, vol. 51, no. 12, pp.4152-4172, Dec. 2005.
[7] X. Deng and A.M. Haimovich, “Power Allocation for Cooperative Relaying in Wireless Networks,” IEEE Comm. Letters, vol. 9, no. 11, pp. 994-997, Nov. 2005.
[8] S. Serbetli and A. Yener, “Optimal Power Allocation for Relay Assisted F/TDMA Ad Hoc Networks,” Proc. Int'l Conf. Wireless Networks, Comm. and Mobile Computing, 2005.
[9] A. Bletsas, A. Khisti, D.P. Reed, and A. Lippman, “A Simple Cooperative Diversity Method Based on Network Path Selection,” IEEE J. Selected Areas in Comm., vol. 24, no. 3, pp.659-672, Mar. 2006.
[10] B. Zhao and M.C. Valenti, “Practical Relay Networks: A Generalization of Hybrid-ARQ,” IEEE J. Selected Areas in Comm., vol. 23, no. 1, pp. 7-18, Jan. 2005.
[11] G. Li and H. Liu, “On the Capacity of Broadband Relay Networks,” Conf. Record of the 38th Asilomar Conf. Signals, Systems and Computers, 2004.
[12] G. Li and H. Liu, “Resource Allocation for OFDMA Relay Networks,” Conf. Record of the 38th Asilomar Conf. Signals, Systems and Computers, 2004.
[13] T. Abe, H. Shi, T. Asai, and H. Yoshino, “A Relaying Scheme for MIMO Wireless Networks with Multiple Source and Destination Pairs,” Proc. 11th Asia-Pacific Conf. Comm. (APCC), 2005.
[14] M. Qin and R. Blum, “Capacity of Wireless Ad Hoc Networks with Cooperative Diversity: A Warning on the Interaction of Relaying and Multi-Hop Routing,” Proc. IEEE Int'l Conf. Comm. (ICC), 2005.
[15] G. Scutari, S. Barbarossa, and D. Ludovici, “Cooperation Diversity in Multihop Wireless Networks Using Opportunistic Driven Multiple Access,” Proc. Fourth IEEE Workshop Signal Processing Advances in Wireless Comm. (SPAWC '03), pp. 170-174, June 2003.
[16] A. Mercado and B. Azimi-Sadjadi, “Power Efficient Link for Multi-Hop Wireless Networks,” Proc. 41st Allerton Conf. Comm., Control, and Computing, Oct. 2003.
[17] D. Tse and P. Viswanath, Fundamentals of Wireless Communications. Cambridge Univ. Press, 2005.
[18] P. Gupta and P. Kumar, “The Capacity of Wireless Networks,” IEEE Trans. Information Theory, vol. 46, no. 2, pp. 388-404, Mar. 2000.
[19] A. Sahai, R. Tandra, and N. Hoven, “Opportunistic Spectrum Use for Sensor Networks: The Need for Local Cooperation,” to be published in, Proc. Fifth Int'l Conf. Information Processing in Sensor Networks (IPSN), 2006.
[20] H. Ma, H.M.K. Alazemi, and S. Roy, “Stochastic Model for Optimizing Physical Carrier Sensing and Spatial Reuse in WirelessAd Hoc Networks,” Proc. Second IEEE Int'l Conf. Mobile Ad-Hoc and Sensor Systems (MASS '05), Nov. 2005.
[21] T.S. Rappaport, Wireless Communications: Principles and Practice, second ed. Prentice Hall PTR, 2001.
[22] R. Diestel, Graph Theory. Springer, 2005.
[23] M.R. Garey and D.S. Johnson, Computers and Intractability: A Guide to the Theory of NP-Completeness. W.H. Freeman, 1990.
[24] S. Ramanathan, “A Unified Framework and Algorithm for Channel Assignment in Wireless Networks,” Wireless Networks, vol. 5, no. 2, pp. 81-94, Mar. 1999.
[25] C. Peng, H. Zheng, and B.Y. Zhao, “Utilization and Fairness inSpectrum Assignment for Opportunistic Spectrum Access,” Mobile Networks and Applications, 2006.
[26] L. Cao and H. Zheng, “Distributed Spectrum Allocation via Local Bargaining,” Proc. Second Ann. IEEE Comm. Soc. Conf. Sensor and Ad Hoc Comm. and Networks (SECON '05), Sept. 2005.
[27] H. Zheng and L. Cao, “Device Centric Spectrum Management,” Proc. IEEE Symp. New Frontiers in Dynamic Spectrum Access Networks (DySPAN '05), Nov. 2005.
[28] M. Penrose, Random Geometric Graphs. Oxford Univ. Press, 2003.
[29] C. McDiarmid, “Random Channel Assignment in the Plane,” Random Structures & Algorithms, vol. 22, pp. 187-212, Mar. 2003.
[30] K.B. Athreya and S.N. Lahiri, Measure Theory and Probability Theory. Springer, 2006.

Index Terms:
Wireless sensor networks, Network communications, Wireless communication
Yan Zhu, Haitao Zheng, "Understanding the Impact of Interference on Collaborative Relays," IEEE Transactions on Mobile Computing, vol. 7, no. 6, pp. 724-736, June 2008, doi:10.1109/TMC.2007.70790
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