Interference mitigation schemes for D2D MIMO communications underlaying a cellular network
- 주제(키워드) Device-to-device communications , Interference management , MIMO
- 발행기관 서강대학교 일반대학원
- 지도교수 소재우
- 발행년도 2017
- 학위수여년월 2017. 8
- 학위명 박사
- 학과 및 전공 일반대학원 전자공학과
- 실제URI http://www.dcollection.net/handler/sogang/000000062057
- 본문언어 영어
- 저작권 서강대학교 논문은 저작권보호를 받습니다.
초록/요약
Device-to-device (D2D) communications underlaying a cellular network have drawn considerable attention due to the possibility of providing higher data rates for local services. However, when the D2D communications share the same time-frequency resources with the cellular network, the data rate of the cellular network decreases because of the inter-system interference from the D2D communications to the cellular network. Moreover, the data rate of the D2D communications also immensely decreases because of the inter-system interference from the cellular network to the D2D communications and the intra-system interference among D2D devices in the D2D communications. Therefore, an inter- and intra- system interference mitigation scheme for D2D communications underlaying the cellular network is essential to increase the data rates for local services. This dissertation proposes two interference mitigation schemes for D2D communications underlaying a cellular network: an interference mitigation scheme with the inter-system channel state information; and an interference mitigation scheme with the one-bit feedback information. The object of the proposed two schemes is to determine the number of data streams, the transmission power, a precoding matrix and a decoding matrix of D2D networks so as to maximize the system capacity given the number of data streams of a cellular network while satisfying the constraint of the inter-system interference from the D2D networks to the cellular network. Unlike existing interference mitigation schemes, the proposed interference mitigation schemes properly operate regardless of the number of data streams of a cellular network and moreover they do not require changing the precoding matrix and a decoding matrix of a cellular network. This dissertation defines three performance metrics: the system capacity, the number of feedback overhead bits and the computational complexity. Then, this dissertation evaluates the performance of the proposed interference mitigation schemes in terms of the three performance metrics. The simulation results show that the interference mitigation scheme with the inter-system channel state information requires the massive number of feedback overhead bits, but significantly increases the system capacity compared with the conventional interference mitigation schemes. On the contrary, the simulation results show that the interference mitigation scheme with the one-bit feedback information immensely decreases the feedback overhead, although it gracefully decreases the system capacity compared with the previous interference mitigation schemes.
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