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Artificial Noise-Aided User Scheduling for Optimal Secrecy Multiuser Diversity
Bang, Inkyu,Kim, Su Min,Sung, Dan Keun IEEE 2017 IEEE communications letters Vol.21 No.3
<P>In this letter, we propose a user scheduling scheme, which enables non-scheduled users to generate artificial noise in order to enhance wireless security in a multiuser wiretap network, where there exist N users, a single desired receiver, and K eavesdroppers. Our proposed scheme can achieve the optimal multiuser diversity gain (i.e., log log N) by adopting appropriate threshold values for scheduling feedback, which is also able to significantly reduce signaling overhead. We mathematically prove the achievability based on the derivation of a secure user-scaling law. Simulation results demonstrate that the proposed scheme achieves a better average secrecy rate than the conventional scheme in a finite N case, even if both schemes obtain the same secure user-scaling law as N -> infinity.</P>
Artificial Noise-Aided User Scheduling From the Perspective of Secrecy Outage Probability
Bang, Inkyu,Kim, Su Min,Sung, Dan Keun IEEE 2018 IEEE Transactions on Vehicular Technology VT Vol.67 No.8
<P>In this correspondence paper, we propose a secure user scheduling scheme, which selects a user for data transmission and an extra user for artificial noise generation in a multiuser single-input and multiple-output wiretap network. The proposed scheme does not require the instantaneous channel state information of the eavesdropper but effectively reduce the secrecy outage probability. Specifically, the secrecy outage probability of the proposed scheme is mathematically derived in closed form when we consider maximum-ratio combining at both desired receiver and eavesdropper. Through simulations, we verify our analytical results and investigate the effect of unknown location of the eavesdropper on the secrecy outage probability when we consider the notion of a secrecy protected zone.</P>
Bang, Inkyu,Kim, Su Min,Sung, Dan Keun IEEE 2017 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.16 No.11
<P>Simultaneous wireless information and power transfer (SWIPT) is a promising technique to transmit information and harvest energy at the same time. In this paper, we investigate multiuser scheduling criteria in a multiuser SWIPT system taking into account co-channel interference in a multicell environment, where each transmitter operate independently. We propose an <TEX>$\alpha $</TEX>-adaptive scheduling scheme, which is able to adjust a scheduling criterion between maximizing achievable rate and maximizing harvested energy of the scheduled device by adjusting <TEX>$\alpha $</TEX> factor. Employing a power splitting receiver, we derive closed-form analytical results including cumulative distribution function (CDF) of the harvested energy, CDF of the achievable rate, average harvested energy, and average achievable rate. We also investigate the effect of adjustable <TEX>$\alpha $</TEX> factor in the proposed scheduling scheme and multiuser diversity in terms of the CDF of the harvested energy, the CDF of the achievable rate, and rate-energy tradeoff, compared with two conventional scheduling schemes: random scheduling and max-SNR scheduling. Our analytical results provide insightful information for designing multiuser scheduling criteria considering co-channel interference in the SWIPT systems.</P>
Android의 터치기반 동영상 플레이어를 통한 인터넷 쇼핑 서비스
황인규(Inkyu Hwang),박주암(Jooam Park),방용식(Yongsik Bang),방지웅(Jiwoong Bang),김대원(Daewon Kim) 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.1
Android와 I-Phone의 보급으로 스마트폰에 대한 관심이 늘고 있는 추세이다. 스마트폰이 주목 받게된 이유 중 하나는 WiFi를 통한 무선 인터넷일 것이다. 언제 어디서든 AP를 통해서 인터넷에 접속을 하여 원하는 정보를 얻거나, E-mail 확인 등 제한된 공간에서 이용 가능했던 서비스를 공간과 시간에 구애 받지 않고 사용 할 수 있다는 점이다. 스마트폰의 보급 이후 WiFi를 통해 정보를 얻을 수 있는 Application이 속속 등장하고 있다. 본 논문에서는 오픈 플랫폼인 Android의 동영상 플레어를 통한 인터넷 쇼핑 서비스(Mobile Inter-Market Player : 이하 MiMP)를 구현해 보았다.