Degrees of freedom for MIMO interference broadcast channels  

作　　者：REN Hai-ying LIU Yuan-an LIU Fang GAO Jin-chun LIU Kai-ming XIE Gang 

机构地区：[1]School of Electronic Engineering, Beijing University of Posts and Telecommunications

出　　处：《The Journal of China Universities of Posts and Telecommunications》2014年第6期9-16,共8页中国邮电高校学报（英文版）

基　　金：the National Science and Technology Major Project (2012ZX03003001-004);the National Natural Science Foundation of China (61401042, 61327806, 61302083);Beijing Key Laboratory of Work Safety Intelligent Monitoring (Beijing University of Posts and Telecommunications)

摘　　要：Multiple-input multiple-output（MIMO） interference broadcast channel（IBC） plays an important role in the modern wireless communications. The upper bound of degrees of freedom（Do F） and its corresponding achievable schemes was investigated. However, all the achievable schemes require perfect channel state information at transmitters（CSIT）. In absence of CSIT, the Do F value is still unknown. This article mainly focuses on the G-cell K-user MIMO IBC, where there are M antennas at each transmitter and N antennas at each receiver. The transmitters only know channel coherence time internals rather than the values of channel coefficients. The users in the same cell are assumed to be able to share the channel information. Based on a heterogeneous semi-staggered block fading model, a blind interference alignment（IA） scheme was proposed for this scenario. It is shown that when R≥1（ G-1） and R =min（M, KN） max（M, KN）, a total of GKMN（ M ＋KN） Do F can be achieved. The inner bound is same with the decomposition Do F upper bound. Since the complexity is an important performance index to evaluate the achievable scheme, the quantitative analysis for the complexity is presented.Multiple-input multiple-output（MIMO） interference broadcast channel（IBC） plays an important role in the modern wireless communications. The upper bound of degrees of freedom（Do F） and its corresponding achievable schemes was investigated. However, all the achievable schemes require perfect channel state information at transmitters（CSIT）. In absence of CSIT, the Do F value is still unknown. This article mainly focuses on the G-cell K-user MIMO IBC, where there are M antennas at each transmitter and N antennas at each receiver. The transmitters only know channel coherence time internals rather than the values of channel coefficients. The users in the same cell are assumed to be able to share the channel information. Based on a heterogeneous semi-staggered block fading model, a blind interference alignment（IA） scheme was proposed for this scenario. It is shown that when R≥1（ G-1） and R =min（M, KN） max（M, KN）, a total of GKMN（ M ＋KN） Do F can be achieved. The inner bound is same with the decomposition Do F upper bound. Since the complexity is an important performance index to evaluate the achievable scheme, the quantitative analysis for the complexity is presented.

关 键 词：blind IA DOF IBC MIMO 

分 类 号：TN919.3[电子电信—通信与信息系统]