Chulhee Jang

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In this paper, we derive the probability mass function (PMF) and the cumulative mass function (CMF) of the sum of discrete independent and identically distributed random variables. As an application of the PMF and CMF, we analyze the missed-detection, false-alarm, and overall error probabilities of cooperative spectrum sensing with any numbers of(More)
In this paper, we propose a novel detection algorithm for the elementary signal estimator of an IDMA system considering channel estimation error. To develop the algorithm, we derive new probability density function of decision variable reflecting channel estimation error and modify the conventional algorithm based on it. Through computer simulations, it is(More)
In this paper, we propose a IDMA system with relays. We describe the system model and the detection algorithm of the destination. The detection algorithm is based on the chip-by-chip detection algorithm. The proposed system raise no burden to the mobiles and needs very simple relays. Simulation results shows that the proposed system does a role of a(More)
In this letter, we propose the reactive relay selection scheme based on cumulative distribution function (CDF) of SNRs for two-way relay networks over Nakagami-m fading channels. We analyze average relay fairness by deriving the exact integral and asymptotic expressions for relay selection probability. Also, we obtain diversity order by deriving outage(More)
In this paper, we introduce a collision model for vehicular cluster and we propose path selection algorithms for multi-hop VANETs. That is, we propose the intuitive algorithm named range-aware broadcasting (RAB), the collisions minimized optimal path selection algorithm (CM-Opt), SNR-guaranteed optimal path selection algorithm (SNRG-Opt), low-complexity(More)
In this paper, we propose a novel class of a decode-andforward-based (DF) multi-hop transmission system where the relays forward the source data simultaneously and derive a closed-form expression of the outage probability. In addition, we provide an optimization method and a complexity-reduced optimization method. Monte Carlo simulations verify the validity(More)
In this paper, we propose the proactive and the reactive cumulative distribution function (cdf)-based relay selection schemes with a control parameter (CP) in a dual-hop wireless network to easily control the fairness among relays such as the probability of selecting each relay and achieve full diversity. We analyze the probability of selecting a relay and(More)
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