Interference Management for Relay-Aided Cellular Network
중계기가 있는 셀룰레 네트워크를 위한 간섭 제어

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공과대학 전기·컴퓨터공학부
Issue Date
서울대학교 대학원
학위논문 (박사)-- 서울대학교 대학원 : 공과대학 전기·컴퓨터공학부, 2018. 8. 노종선.
In this dissertation, three main contributions are given as i) relay-aided interference

alignment (IA), ii) coded caching for cache-aided multiple-input multiple-output

(MIMO) cellular network, and iii) inter-cell interference coordination (ICIC) based on

cell zooming are considered.

First, we propose an interference alignment scheme for the MIMO uplink cellular

network with the help of a relay which operates in half-duplex mode. The proposed

scheme only requires global channel state information (CSI) knowledge at the

relay, with no transmitter beamforming and time extension at the user equipment (UE),

which differ from conventional IA schemes for cellular networks. We derive the feasibility

condition of the proposed scheme for the general cellular network configuration

and analyze the degrees-of-freedom (DoF) performance of the proposed IA scheme

while providing a closed-form beamformer design at the relay. Extensions of the proposed

scheme to downlink and full-duplex cellular networks are also proposed. The

DoF performance of the proposed schemes is compared to those of linear IA scheme

and relay-aided interference management schemes for a cellular network with no time

extension. It is also shown that advantages similar to those in the uplink case can be obtained

for the downlink case through the duality of a relay-aided interfering multipleaccess

channel (IMAC) and an interfering broadcast channel (IBC). Furthermore, the

proposed scheme for a full-duplex cellular network is shown to have advantages identical

to those of a number of proposed half-duplex cellular cases.

Second, coded caching for cache-aided MIMO cellular network where each UE

has cache with the help of full-duplex relay is proposed. The proposed scheme consists

of inter-cell IA based on relay and coded multicasting based on base station (BS)

beamforming. The normalized delivery time (NDT) performance analysis is given,

where the achievable NDT of proposed scheme exploits multi-antenna gain on BSs and


UEs. Also, it has advantage of no decorrelator design at the UE side to receive multicast

message. Closed-form of BS beamformer for coded caching is also described.

Further, the description of proposed scheme when the relay is aware of demands of the

cells is presented.

Last, ICIC for self organizing cellular network is proposed, where each BS is not

able to share information through backhaul to perform conventional ICIC schemes.

Proposed ICIC scheme is based on distributed cell zooming, where non-cooperative

game theory is used. Further, we show that proposed scheme can efficiently handle

inter-cell interference and coverage hole problem in self organizing network by simulation

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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Theses (Ph.D. / Sc.D._전기·정보공학부)
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