2012/04/17 by Qing F. Zhou, Zhou, Qing F., Q. T. Zhang +1
Computer Science · Engineering · Mathematics · #Advanced MIMO Systems Optimization #Advanced Wireless Communication Technologies #Cooperative Communication and Network Coding #FOS: Computer and information sciences #Information Theory (cs.IT) #cs.IT #math.IT
paper · pdf · doi:10.48550/arxiv.1204.3716
submitted to IEEE Commun. Lett
arxiv created 2012/04/17 · openalex publication_date 2012/04/17 · arxiv updated 2012/04/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Staggered fading pattern between different users is crucial to interference alignment without CSIT, or so-called blind interference alignment (BIA). This special fading structure naturally arises from heterogeneous block fading setting, in which different users experience independent block fading with different coherent times. Jafar et al. prove that BIA can be applied in some special heterogeneous block fading channels, which are formed naturally or constructed artificially. In this paper, we show that in the context of a 2-user 2x1 broadcasting (BC) channel, staggered fading pattern can also be found in homogeneous block fading setting, in which both users experience independent fading with the same coherent time; and we propose a scheme to achieve the optimal 4/3 DoF for the homogenous setting by using BIA. Applying the proposed scheme, we further study a 2x1 BC network with K users undergoing homogeneous block fading. When K>=4, we show it is almost guaranteed that the transmitter can find two users among the K users to form a 2-user 2x1 BC channel which can apply BIA.