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By imitating chaotic disaster situations in risk-free settings, disaster-related simulation can be helpful for training of response participation, damage evaluation, and recovery planning. However, each single simulation needs to interact with others because different simulation combinations are required due to numerous disasters and their complex effects on facilities, and diverse response efforts...
Business patterns of construction require diverse collaborations among participants and systems. To improve communication and the use of information, construction companies have invested on building their own information system. However, the past construction information system has focused on a point-to-point system which has limitation in data exchange with distributed systems. As a result, construction...
In this paper, we propose precoding methods for multiple input multiple output physical network coding systems, which employ the modulo operation. In our work, the transmit and receive filters are determined to maximize the minimum distance on the received constellations. Especially, to address non-concavity of the given problems, we change our problem into a concave one which can be optimized by...
This paper considers a three-way wireless communication system employing physical layer network coding (PNC), where each user desires to transmit independent data to the other users via relay. However, one difficulty with this system is that the performance is limited by worst channel. To overcome this problem, we adopt a scheduling system. Since channel characteristics vary over time in wireless...
Physical layer network coding (PNC) was first introduced by Zhang et al. for two-way relay channels (TWRCs). By utilizing the PNC, we can complete two-way communications within two time slots, instead of three time slots required in non- PNC systems. Recently, the upper and lower bounds for a bit error rate (BER) of PNC have been analyzed for fading channels. In this paper, we derive an exact BER...
Abstract-We consider an asymmetrical two-way relay channel (TWRC) which consists of one relay node and two user nodes in this paper. In TWRCs, we can efficiently use the channel by using the network coding at the relay with the exclusive OR (XOR) operation. However, due to the nature of the XOR, the rate from the relay to a user node should be the same as the rate from the relay to the other user...
We consider a three-way relay channel using a network coding in this paper. We propose a network coding scheme for the three-way relay channels and present a Latin square-like condition for the three-way network code. We also propose several schemes to design a new three-way network code by using the cell swapping and applied the methods to obtain a better network code to obtain a fair symbol error...
The XOR network code is widely used in the conventional network coding. However, when the channel is noisy, the XOR code is suboptimal in terms of minimizing distortion in the source signal. We propose to use a new network code for the two-way relay channel, designed to minimize signal distortion due to the channel noise. We assume the source signal X is encoded by a source encoder and the sequence...
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