【電機系書報討論演講訊息】 

書報討論網頁：http://www.ee.nthu.edu.tw/~ee591000/

演講公告網址：/p/403-1175-2629-1.php

題   目：On Feasibility of Linear Interference Alignment with Symbol Extension for Two-Cell MIMO Interfering Multiple Access Channel

講   員：黃家麒 教授 (元智大學)

時         間：2014年6月6日(星期五) 下午2時20分 (2時10分入場)

地         點：台達館105教室

Abstract

Interfering multiple access channel (IMAC) consists of several traditional multiple access channels (MAC) that interfere with each other, and IMAC is of practical importance because it models the environment of the uplink communications of several adjacent cells. To study the interference management of the cellular networks, researchers have applied linear interference alignment scheme to IMAC to obtain the optimal integer degrees of freedoms (DoF) of the channel, while the issue of non-integer DoF is less addressed in the literature.

In this talk, we will explore the non-integer degrees of freedoms (DoF) of the time-invariant multiple-input multiple-output (MIMO) interfering multiple access channel (IMAC) in the simple setting of two cells, K users per cell, and M antennas at all nodes. We apply the idea of channel diversity developed by Li, Jafarkhani, and Jafar to this setting to derive the exact characterization of the maximum achievable sum DoF under the constraint of using linear interference alignment (IA) scheme. We show that the sum DoF characterization 2MK/(1 + K) provided by the linear IA scheme only holds for K ≤ M². Symbol extension is applied to the linear IA scheme for the achievability of the non-integer DoF, and the upper bound is constructed by using the block-diagonal structure of the extended channel matrix, where all blocks are the same.

Bio

Chiachi Huang received the B.S. degree in electrical engineering from Yuan Ze University, Taoyuan, Taiwan, in 1999, the M.S. degree in communications engineering from National Tsing Hua University, Hsingchu, Taiwan, in 2001, and the Ph.D. degree in electrical engineering from the University of California at Irvine, California, USA, in 2009. Since 2009, he has been with the Department of Communications Engineering at Yuan Ze University, Taoyuan, Taiwan, as an Assistant Professor. His research interests include multiuser information theory, wireless communications, and MIMO networks. He received the Best Paper Award for Young Authors from the IEEE Information Theory and Communication Societies Taipei/Tainan Chapter in 2013.

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