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This paper reports the results of wideband channel measurements conducted on in house outlets. Two kinds of channel measurements were performed: impulse response measurements and noise signal measurements. In measure based channel model, preamble assisted orthogonal frequency-division multiplexing access (OFDM) receiver scheme is proposed for differential(More)
A face occlusion detection scheme which is based on both skin color ratio (SCR) and Local Binary Pattern (LBP) feature, is proposed. The proposed method mainly consists of four steps: foreground extraction, head detection, feature extraction, and occlusion detection. First, foreground is extracted by codebook background subtraction algorithm. Then, the head(More)
In this paper, we show the hidden terminal problem of Korea Standard protocol in the PLC access network. PLC access network has serious hidden terminal problem at the master nodes because of its topology characteristic. We propose simple strategies to improve performance. The proposed strategies can make network operate in acceptable throughput range when(More)
In this paper, we focus on retransmission following transmission failure in an impulse radio ultra wideband (IR-UWB) system. The causes of transmission failure are classified and a new “selfish” retransmission protocol is proposed. Simulation results show that the proposed protocol improves throughput by up to 100% and decreases retransmission(More)
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