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Interference Management for Relay-Aided Cellular Network : 중계기가 있는 셀룰레 네트워크를 위한 간섭 제어
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- Authors
- Advisor
- 노종선
- Major
- 공과대학 전기·컴퓨터공학부
- Issue Date
- 2018-08
- Publisher
- 서울대학교 대학원
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 공과대학 전기·컴퓨터공학부, 2018. 8. 노종선.
- Abstract
- 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
i
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
result.
- Language
- English
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