Suhan Choi

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In this paper, we consider a graph-based framework for transmission of correlated sources over multiple-access channels. It is well known that the separation approach is not optimal for this multiuser communication. Our objective in this work is to reintroduce modularity in this problem using a graph-based discrete interface and to minimize the performance(More)
In this paper, we consider the communication problem that involves transmission of correlated sources over broadcast channels. We consider a graph-based framework for this information transmission problem. The system involves a source coding module and a channel coding module. In the source coding module, the sources are efficiently mapped into a nearly(More)
In this paper, a channel-adaptive random access transmission scheme is presented for time-division-duplex (TDD)-based wireless systems. In a TDD-based wireless system, using the channel reciprocity, the channel gain of an uplink (UL) can be estimated from that of a downlink. The channel-adaptive random access scheme allows the transmission of a random(More)
In this paper, the multiterminal sources is mapped independently into a message set characterized by a graph which preserves a predetermined amount of correlation between the sources, and the message set becomes the input to channel encoder. In this work joint source-channel coding scheme is considered as a part with associated message graph for(More)
This paper proposes a method to maximize the lifetime of a cluster-tree ZigBee network under the constraint that every data flow should deterministically meet its end-to-end deadline for hard real-time sensing/control applications. The proposed method decomposes the network-wide optimization problem into a set of per-cluster optimization problems and hence(More)
As a radio access technology for next generation cellular networks, 3GPP and 3GPP2 are standardizing long term evolution (LTE) and ultra mobile broadband (UMB), respectively. In this paper, we compare the handover schemes of both technologies in three aspects, i.e., interruption time of a user plane, required wireless resources and the overhead for avoiding(More)
In this paper we consider the communication problem that involves transmission of correlated sources over broadcast channels. We consider a graph-based framework for this information transmission problem. The system involves a source coding module and a channel coding module. In the source coding module, the sources are efficiently represented using a(More)