Retrospective Interference Alignment for the Two-Cell MIMO Interfering Multiple Access Channel
Retrospective Interference Alignment for the Two-Cell MIMO Interfering Multiple Access Channel
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DOI：
10.1109/twc.2015.2415474
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发表时间：
2015-03
影响因子：
10.4
通讯作者：
W. Shin;Jungwoo Lee
中科院分区：
文献类型：
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作者：
W. Shin;Jungwoo Lee
在本文中，我们提出了一种新的追溯干扰对齐两个小区的多输入多输出（MIMO）干扰多址接入信道（IMAC）与M接收天线每个基站（BS）和K个用户每个小区与N个发射天线。回顾性IA的关键思想在于第1和第2阶段的干扰净化，以及第3阶段的干扰重复。在该方法的基础上，我们证明了在发送端信道状态信息完全延迟（CSIT）的情况下，当K M <NK时，可实现的和自由度（sum-DoF）等于2 M（[2 M/N]+ 1）/（2 [2 M/N] + 1）;当NK ≤ M时，可实现的和自由度（sum-DoF）等于min{2KN，M}.它示出，具有延迟CSIT可以严格地增加总和DoF相比，没有CSIT的蜂窝网络的情况下，特别是对于上行链路的情况。
In this paper, we propose a new retrospective interference alignment for two-cell multiple-input multiple-output (MIMO) interfering multiple access channels (IMAC) with M receive antennas per base station (BS) and K users per cell each with N transmit antennas. The key idea of the retrospective IA lies in interference-purification during phase 1 and 2, and interference-repetition during phase 3. On the basis of the proposed method, we show that the achievable sum degrees of freedom (sum-DoF) is equal to 2M ([2M/N]+ 1) / (2 [2M/N] + 1) if K M <; NK and min{2KN, M} if NK ≤ M with completely delayed channel state information at the transmitters (CSIT). It is shown that having delayed CSIT can strictly increase the sum-DoF compared to the case with no CSIT for cellular networks, especially for uplink scenarios.