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Optimal Transmission in MIMO Channels With Multiuser Interference
Mai, Vien V.,Kwak, Jin Sam,Jeong, Youngmin,Shin, Hyundong IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.11
<P>Cochannel interference is one of the inevitable deleterious components in designing and analyzing of a wireless network. The use of multiple antennas at both transmitting and receiving nodes is a promising technique to suppress and/or alleviate the effect of cochannel interference on capacity. In this paper, we assess the effects of both antenna correlation and cochannel interference on the ergodic capacity of multiple-input multiple-output channels with covariance feedback. In particular, we consider a general family of spatial fading correlation model-called <I>unitary-independent-unitary</I>-which encompasses most of zero-mean channels with arbitrary fading profiles including the popular separable correlation channel models. We derive the average minimum mean-square error and signal-to-interference-plus-noise ratio of the parallel spatial streams using Berezin’s supermathematics. We then put forth the structure of optimal input covariance matrix maximizing the mutual information connected with the necessary and sufficient conditions as a generalization of the noise-limited case, which is tested by a simple iterative algorithm. Together with the powerful supermathematical framework, the result in the paper enables us to quantify the multiuser MIMO interference effects on the capacity in terms of spatial correlation and interference power heterogeneity.</P>
Shin, Won-Yong,Mai, Vien V.,Jung, Bang Chul,Yang, Hyun Jong IEEE Computer Society 2017 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.16 No.8
<P>We introduce a new achievability scheme, termed opportunistic network decoupling (OND), operating in virtual full-duplex mode. In the scheme, a novel relay scheduling strategy is utilized in the K x N x K channel with interfering relays, consisting of K source-destination pairs and N half-duplex relays in-between them. A subset of relays using alternate relaying is opportunistically selected in terms of producing the minimum total interference level, thereby resulting in network decoupling. As our main result, it is shown that under a certain relay scaling condition, the OND protocol achieves K degrees of freedom even in the presence of interfering links among relays. Numerical evaluation is also shown to validate the performance of the proposed OND. Our protocol basically operates in a fully distributed fashion along with local channel state information, thereby resulting in relatively easy implementation.</P>
반비엔마이,김주엽,최상원,신원용,Mai, Vien V.,Kim, Juyeop,Choi, Sang Won,Shin, Won-Yong 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.1
다중 경로 약한 산란 (poor scattering) 전 이중 (full-duplex) 시스템에서 혼성 스케줄링을 소개한다. 제안하는 시스템은 다중 안테나를 갖는 하나의 전 이중 기지국과 수 많은 단일 안테나 반 이중 (half-duplex) 단말로 구성된다. 혼성 스케줄링은 송신기에서의 부분적 채널 정보만을 활용한다. 특별히, 상향링크 및 하향링크에서 모두 기회적 송신 기술을 사용하는 기존 스케줄링 방법과는 달리, 제안하는 기술은 하향링크에서의 랜덤 송신 빔형성 및 상향링크에서의 간섭 제거 빔형성을 결합하여 사용한다. 주요 결과로써, 컴퓨터 모의실험을 통해 제안한 기술이 기존 스케줄링 방법보다 특정 신호 대 잡음비 영역 이상에서 훨씬 더 우수한 합 용량 성능을 가짐을 보인다. We introduce a hybrid scheduling in a multi-path poor scattering full-duplex (FD) system, which consists of one multi-antenna FD base station and a large number of single-antenna half-duplex mobile stations. Our hybrid scheduling utilizes partial channel state information at the transmitter. In particular, unlike the conventional scheduling method using opportunistic transmission for both uplink and downlink, the proposed scheme combines a random transmit beamforming for downlink and a zero forcing beamforming for uplink. As our main result, via computer simulations, it is shown that the proposed scheme has a superior sum-rate performance than that of the conventional scheduling method beyond a certain signal-to-noise ratio regime.