Abstract
This paper proposes an adaptive combiner model that maximizes the performance of multi-rate cooperative relaying transmission in resources aware systems. Users’ cooperation is applied to smartly profit from the network resources to reach for efficient multi-rate transmissions. The low rate terminal uses a part of his bandwidth and power to relay the high rate user data side by side with his own data. This results in small performance degradation to the low rate user performance. The combiner model at the high rate terminal is carefully investigated for an optimized system performance and an adaptive combiner is proposed. The model calculates the weights adaptively for each bit based on a dynamic-blind method. The adaptive combiner is evaluated against the maximal-ratio combiner MRC and the equal gain combiner EGC to reach for the best model for the multi-rate relaying framework. Based on half-duplex mode, the probability of error performance is studied and compared for each combiner model under different channel conditions. The results show that the proposed adaptive combiner, characterized by its reliability and simplicity, leads to the best performance compared to the other models.
Similar content being viewed by others
References
Ottosson, T., & Svensson, A. (1995). Multi-rate schemes in DS-CDMA systems. Proceedings of IEEE Vehicular Technology Conference. doi:10.1109/VETEC.1995.505019.
Chen, M., & Hwang, R. (2006). Efficient OVSF code assignment and reassignment strategies in UMTS. IEEE Transactions on Mobile Computing, 5(7), 769–783. doi:10.1016/j.comcom.2005.09.010.
Dell’Amico, M., Merani, M., & Maffioli, F. (2000). Efficient algorithms for assignment of OVSF codes in wideband CDMA. Proceedings of IEEE International Conference on Communications. doi:10.1109/ICC.2002.997400.
Fan, P., & Darnell, M. (1996). Sequence design for communications applications. New York: Wiley.
Laneman, J., Tse, D., & Wornell, G. (2004). Cooperative diversity in wireless networks: efficient protocols and outage behaviour. IEEE Tranactions on Information Theory, 50(12), 3062–3080. doi:10.1109/TIT.2004.838089.
Azarian, K., El Gamal, H., & Schniter, P. (2005). On the achievable diversity-multiplexing tradeoffs in half duplex cooperative channels. IEEE Transaction on Information Theory, 51(12), 4152–4172. doi:10.1109/TIT.2005.858920.
Venturino, L., Wang, X., & Lops, M. (2006). Multiuser detection for cooperative networks and performance analysis. IEEE Transactions on Signal Processing. doi:10.1109/TSP.2006.877646.
Kramer, G., Gastpar, M., & Gupta, P. (2005). Cooperative strategies and capacity theorems for relay networks. IEEE Transactions on Information Theory, 51(9), 3037–3063. doi:10.1109/TIT.2005.853304.
Gunduz, D., & Erkip, E. (2007). Opportunistic cooperation by dynamic resource allocation. IEEE Transactions on Wireless Communications, 6(4), 1446–1454. doi:10.1109/TWC.2007.348341.
El-Ganainy, N., & El-Khamy, S. (2011). A cooperative resource allocation strategy for multi-rate transmissions in wireless networks. XXX URSI General Assembly and Scientific Symposium of International Union of Radio Science URSI GA 2011. doi:10.1109/URSIGASS.2011.6050575.
El-Ganainy, N., & El-Khamy, S. (2013). An efficient bandwidth sharing strategy through users’ cooperation for multi-rate networks. Radio Science Journal, 48(5), 653–665. doi:10.1002/2013RS005195.
Sediq, Bin, & Yanikomeroglu, H. (2009). Performance analysis of soft-bit maximal ratio combining in cooperative relay networks. IEEE Transactions on Wireless Communications, 8(10), 4934–4939. doi:10.1109/TWC.2009.081187.
Zimmermann, E., Herhold, P., & Fettweis, G. (2005). On the performance of cooperative relaying protocols in wireless networks. European Transactions on Telecommunications (ETT), 16(1), 5–16. doi:10.1002/ett.1028.
Boujemma, H. (2011). Bit error probability of cooperative MC-CDMA systems using decode-and-forward relaying. European Transactions on Telecommunications (ETT), 23(1), 25–35. doi:10.1002/ett.1505.
El-Ganainy, N., & El-Khamy, S. (2012). A new practical receiver for decode-and-forward cooperative CDMA systems based on a blind λ-combiner. Progress in Electromagnetic Research Letters (PIERL), 28, 23–36. doi:10.2528/PIERL11092806.
Sendonaris, A., Erkip, E., & Aazhang, B. (2003). User cooperation diversity—Part I: system description. IEEE Transactions on Communications, 51(11), 1927–1938. doi:10.1109/TCOMM.2003.818096.
Sendonaris, A., Erkip, E., & Aazhang, B. (2003). User cooperation diversity—Part II: implementation aspects and performance analysis. IEEE Transactions on Communications, 51(11), 1939–1948. doi:10.1109/TCOMM.2003.819238.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
El-Ganainy, N., El-Khamy, S. An Adaptive Combiner Model for Multi-Rate Relaying Transmissions in Cognitive Systems. Wireless Pers Commun 95, 773–782 (2017). https://doi.org/10.1007/s11277-016-3797-4
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11277-016-3797-4