On the feasibility of full-duplex large-scale MIMO cellular systems and its applications = 셀룰러 통신환경에서 대용량 안테나 전이중 통신의 실효성에 관한 연구와 그 응용

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This thesis concerns the feasibility of full-duplex large-scale multiple-input-multiple-output (MIMO) cellular systems, and, furthermore, its application, the feasibility of multi-hop millimeter wave (mmWave) wireless self-backhauling with full-duplex small-base stations (S-BSs) is investigated. In Chapter 1, we generally introduce the backgrounds of the thesis, large-scale MIMO or massive MIMO, full-duplex, and mmWave communication. Next, in Chapter 2 and 3, we investigate the feasibility of full-duplex large-scale MIMO system considering two multicell scenarios, non-cooperative and cooperative multicell sys-tems in detail. To elaborate, in Chapter 2, we first derive the analytic model of the ergodic achievable sum-rate for cell-boundary users by considering the non-cooperative multicell system. The model is derived by applying a simple linear filter, i.e., matched filter or zero-forcing filter, to the base-station (BS). In the analytic model, we consider large-scale fading, pilot contamination, transmitter noise and receiver distortion. In addition, to solve critical pilot overhead problem induced by self-interference channel estimation, we propose a pilot transmission scheme – the simultaneous pilot transmission (SPT) – and assess its performance, in terms of the ergodic sum-rate. Then, we obtain the ergodic achievable sum-rate. In Chapter 3, considering the cooperative multicell system, we ob-tain the ergodic achievable sum-rate by reflecting the characteristic of its scenario such as limited front-haul capacity and procedures of channel estimation, as similar as in the second chapter. With all derived results, to investigate the feasibility, we observe the trade-offs between the full- and half-duplex systems, between the SPT and conventional scheme, and between the two multicell scenarios with respect to various system param-eters and environment. In the end, we confirm the tightness of our analytic model and advantages of full-duplex, SPT, and cooperation of BSs in our system model. In Chap-ter 4, in the line with Chapter 2 and 3, we simply investigate it application, which is the multi-hop mmWave wireless self-backhauling system with full-duplex S-BSs. In this application, we investigate the frequency band, sub-6GHz and mmWave band, usage in heterogeneous network, and, furthermore, we show the possible gain of full-duplex S-BSs in multi-hop scenario by deriving the end-to-end (E2E) latency as a performance metric. By reflecting the overhead of channel estimation and data transmission, we show that multi-hop mmWave wireless self-backhauling enables to obtain more gain for certain en-vironment. Furthermore, as the S-BS operates as the full-duplex mode, it brings more gain compared with the half-duplex mode, and the gain becomes larger as the number of hops increase. In summary, we overall investigate the feasibility of full-duplex large-scale MIMO cellular system, and its application. As a result, we show the possible gain of full-duplex operation by proposing the pilot transmission scheme and deriving the analytic model. Thus, we believe that this thesis enables to provide the guideline of many kinds of fullduplex system.
Kang, Joonhyukresearcher강준혁researcher
한국과학기술원 :전기및전자공학부,
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학위논문(박사) - 한국과학기술원 : 전기및전자공학부, 2019.2,[vii, 96 p. :]


Large-scale MIMO▼afull-duplex communication▼acloud-radio access networks▼achannel estimation▼amillimeter wave▼aself-backhauling▼amulti-top; 대용량 안테나▼a전이중 통신▼a클라우드 무선 접속망▼a밀리미터파▼a자가백홀링

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