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The following topics are dealt with: wireless communication technology; mobile communication; next generation network technology; RFID & USN technology; systems and software engineering; and network management.
In this paper, we discuss evaluation results on parasitic effects in RC polyphase filters, where those parasitics appear in LSI implementation. Parasitic capacitance is well known as typical parasitic element, and it degrades circuit performance. We verify performance of an RC polyphase filter with parasitic capacitance in aspects of filter response and Packet Error Rate(PER). We also discuss filter...
In this paper, we propose the new channel estimation algorithm for orthogonal frequency division multiplexing (OFDM) system in fast fading channels. It is two-step procedure. In the first step, we obtain an initial estimation of channel response at pilot subcarriers by least square method, then we employ the Gaussian radial basis function as a efficient nonlinear interpolator to estimate the channel...
Multi-antenna-based multi-input multi-output (MIMO) communications becomes the next revolution in wireless data communications. MIMO has gone through the adoption curve for commercial wireless systems to the point that today, all high throughput commercial standards, i.e. WiMax, Wi-Fi, cellular, etc., have adopted MIMO as part of the optional. This paper is to present our investigations of the behaviors...
Based on the conception of voting, this paper proposes an error control scheme of hybrid ARQ for binary linear block codes over AWGN channel. The proposed scheme keeps each decoded code word in the memory buffers as a candidate at each transmission. Whenever there are a number of code words in the candidates are the same one, retransmission stops. In other words, the plurality of code words among...
Ultra-wideband (UWB) technology is very popular in this time. UWB offers a promising solution to the lack of radio frequency (RF) spectrum by allowing new services to coexist with current radio systems with minimal or no interference. Two crucial keys to communications success of UWB systems are pulse transmission power and timing jitter tolerance. These conditions can be control by the pulse shape...
In multiple input multiple output (MIMO) communication systems, the rate of data transfer can be increased with increasing number of simultaneously transmitting and receiving antennas. Antenna selection is essential in MIMO transceiver systems. With effective selection algorithms, the signals with the highest quality can be selected over the range of various arriving signals. Many algorithms has been...
In this paper, we propose a new ground-to-train communication system using mobile object tracking technique thinking that can realize enough transmission speed on the moving train. Based on the field experiments, we report our proposed system's effectiveness as the new high-speed ground-to-train communication system. We also propose the tracking control algorithm of beacon light using the wide-angle...
The recent advance in the intelligent transportation system (ITS) has led the FCC to allocate 7 channels at 5.9 GHz band for wireless access for vehicular environments (WAVE) systems. The key challenge of multi-channel access in vehicular ad-hoc networks (VANET) is to cope with the dynamic channel condition due to highly mobile nodes, while providing fair spectrum share among nodes. In this paper,...
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