Adaptive limited feedback for interference alignment in MIMO interference channels

被引:1
作者
Zhang, Yang [1 ]
Zhao, Chenglin [1 ,2 ]
Meng, Juan [3 ]
Li, Shibao [2 ]
Li, Li [2 ]
机构
[1] Beijing Univ Posts & Telecommun, Sch Informat & Commun Engn, Xitucheng Rd, Beijing 100876, Peoples R China
[2] China Univ Petr, Coll Comp & Commun Engn, Changjiang West Rd, Qingdao 266580, Peoples R China
[3] Inst Disaster Prevent, Dept Disaster Prevent Instrument, Xueyuan Rd, Sanhe 065201, Peoples R China
来源
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING | 2016年
关键词
MIMO; Interference alignment; Limited feedback; Waterfilling; SENSOR NETWORKS; TARGET RECOGNITION; SYSTEMS; RADAR; SETS;
D O I
10.1186/s13638-016-0724-z
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
It is very important that the radar sensor network has autonomous capabilities such as self-managing, etc. Quite often, MIMO interference channels are applied to radar sensor networks, and for self-managing purpose, interference management in MIMO interference channels is critical. Interference alignment (IA) has the potential to dramatically improve system throughput by effectively mitigating interference in multi-user networks at high signal-to-noise (SNR). However, the implementation of IA predominantly relays on perfect and global channel state information (CSI) at all transceivers. A large amount of CSI has to be fed back to all transmitters, resulting in a proliferation of feedback bits. Thus, IA with limited feedback has been introduced to reduce the sum feedback overhead. In this paper, by exploiting the advantage of heterogeneous path loss, we first investigate the throughput of IA with limited feedback in interference channels while each user transmits multi-streams simultaneously, then we get the upper bound of sum rate in terms of the transmit power and feedback bits. Moreover, we propose a dynamic feedback scheme via bit allocation to reduce the throughput loss due to limited feedback. Simulation results demonstrate that the dynamic feedback scheme achieves better performance in terms of sum rate.
引用
收藏
页数:8
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