Abstract:In multi-user MIMO systems, the accuracy of the Channel State Information (CSI) has a sufficient effect on performance of interference alignment scheme. To solve the problem of interference leakage caused by limited feedback of CSI, a novel method for interference alignment based on dynamic feedback and power allocation is proposed. First, the relationship between system sum rate and the allocation for channel state feedback bits and transmitting power is analyzed theoretically, and the formula of sum rate of the system considering dynamic feedback and power allocation is derived. Based on the above analysis, the model of optimizing allocation for feedback bits and power problem is set to improve the throughput of system. Then, a low-complexity solution to the problem is raised on the basis of channel quasi-static characteristic, and the feedback bit and power allocation scheme are obtained by the Karush-Kuhn-Tucker (KKT) condition. Simulation results show that the proposed method can effectively reduce the interference leakage and improve the system sum rate compared with the interference alignment scheme that just dynamically feedback’s channel state.
李世宝, 贺昌, 刘建航, 王宜馨. 基于动态反馈与功率分配的干扰对齐方法[J]. 电子与信息学报, 2018, 40(3): 728-733.
LI Shibao, HE Chang, LIU Jianhang, WANG Yixin. Novel Interference Alignment Scheme Based on Dynamic Feedback and Power Allocation. JEIT, 2018, 40(3): 728-733.
CADAMBE V R and JAFAR S A. Interference alignment and degrees of freedom of the K-user interference channel[J]. IEEE Transactions on Information Theory, 2008, 54(8): 3425-3441. doi: 10.1109/TIT.2008.926344.
[2]
GOMADAM K, CADAMBE V R, and JAFAR S A. A distributed numerical approach to interference alignment and applications to wireless interference networks[J]. IEEE Transactions on Information Theory, 2011, 57(6): 3309-3322. doi: 10.1109/TIT.2011.2142270.
[3]
PETERS S W and HEATH R W. Cooperative algorithms for MIMO interference channels[J]. IEEE Transactions on Vehicular Technology, 2011, 60(1): 206-218. doi: 10.1109/ TVT.2010.2085459.
LI Ning, Wang Siwen, ZHAI Lijun, et al. Compensating Method of L-band Radar ISAR Imaging for Ionosphereic Target with High-velocity[J]. Journal of Electronics & Information Technology, 2016, 38(3): 643-648. doi: 10.11999/ JEIT150648.
[5]
LOVE D J, HEATH R W, LAU V K N, et al. An overview of limited feedback in wireless communication systems[J]. IEEE Journal on Selected Areas in Communications, 2008, 26(8): 1341-1365. doi: 10.1109/TVT.2010.2085459.
[6]
THUKRAL J and BOLCSKEI H. Interference alignment with limited feedback[C]. IEEE International Symposium on Information Theory. Seoul, 2009: 1759-1763. doi: 10.1109/ ISIT.2009.5205266
[7]
KRISHNAMACHARI R T and VARANASI M K. Interference alignment under limited feedback for MIMO interference channels[J]. IEEE Transactions on Signal Processing, 2013, 61(15): 3908-3917. doi: 10.1109/TSP.2013. 2264055.
ZHANG Yang, ZHOU Zheng, SHI Lei, et al. Interference alignment with single feedback for downlink cellular networks[J]. Journal of Electronics & Information Technology, 2012, 34(12): 2816-2822. doi: 10.3724/SP.J.1146.2012.00583.
[9]
PHAM K and LEE K. Interference alignment for multicell multiuser mimo uplink channels[J]. IEEE Transactions on Vehicular Technology, 2016, 65(7): 5146-5159. doi: 10.1109/ TVT.2015.2459381.
CHEN X and YUEN C. On interference alignment with imperfect CSI: Characterizations of outage probability, ergodic rate and SER[J]. IEEE Transactions on Vehicular Technology, 2016, 65(1): 47-58. doi: 10.1109/TVT.2015. 2397000.
[12]
CHO S, HUANG K, KIM D K, et al. Feedback-topology designs for interference alignment in MIMO interference channels[J]. IEEE Transactions on Signal Processing, 2012, 60(12): 6561-6575. doi: 10.1109/TSP.2012.2214214.
[13]
KIM J S, MOON S H, LEE S R, et al. A new channel quantization strategy for MIMO interference alignment with limited feedback[J]. IEEE Transactions on Wireless Communications, 2012, 11(1): 358-366. doi: 10.1109/TWC. 2011.111211.110810.
[14]
RAO X, RUAN L, and LAU V K N. Limited feedback design for interference alignment on MIMO interference networks with heterogeneous path loss and spatial correlations[J]. IEEE Transactions on Signal Processing, 2013, 61(10): 2598-2607. doi: 10.1109/TSP.2013.2252168.
[15]
PANAHI F H, OHTSUKI T, JIANG W, et al. Interference alignment and power allocation for multi-user MIMO interference channels[C]. IEEE International Conference on Communications, Kuala Lumpur, 2016: 1-7. doi: 10.1109/ ICC.2016.7510851.
LEI Weijia, ZHANG Qin, and XIE Xianzhong. Interference alignment and power allocation algorithm of two unicast multiple hops network[J]. Journal of Beijing University of Posts and Telecommunication, 2015, 38(3): 71-76. doi: 10.13190/j.jbupt.2015.03.011.
[17]
REZAEE M and GUILLAUD M. Interference alignment with quantized Grassmannian feedback in the K-user constant MIMO interference channel[J]. IEEE Transactions on Wireless Communications, 2016, 15(2): 1456-1468. doi: 10.1109/TWC.2015.2490223.