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We previously proposed a simple decoding method for short-range multiple-input multiple-output (SR-MIMO) transmission that can reduce signal processing complexity by performing MIMO detection with an analog weighting circuit. In this paper, we evaluate the method's broadband transmission performance and antenna displacement tolerance by using a 4×4 SR-MIMO prototype system employing the method for...
In a short-range multiple-input and multiple-output (SR-MIMO) transmission system that relies on line-of-sight (LOS) propagation, the channel matrix is determined by the antenna geometry, hence radio frequency (RF) signal processing by using an analog matrix circuit is a valid means of separating spatially-multiplexed multiple signal streams. To date several simple decoding methods utilizing this...
In this paper, a simple method for canceling interference by using antenna directivities is proposed for short-range transmission systems. For higher data transmission systems the millimeter-wave frequency bands are useful because of their wide bandwidths. Also, Multiple-Input Multiple-Output (MIMO) technology can be applied to these bands because the application enables channel capacity to be increased...
Higher data rate wireless transmission systems are needed to meet the needs for high-speed wireless transmission of high definition videos and large files. In wireless communications, the multiple-input multiple-output (MIMO) transmission technique [1] has been gathering attention because it can increase the wireless transmission rate without expanding the frequency bandwidth through the use of multiple...
Efficiency of power amplifiers has been a major issue in the field of wireless transmitters and microwave power transmitters. Accordingly, many techniques for high efficiency have been proposed [1][2]. The use of class-F amplifiers has been considered to be one of the most effective approaches at microwave or higher frequencies. The drain efficiency is 100% for ideal class-F operation with an infinite...
We designed and fabricated the rectennas which use class-F load as an output filter in order to develop highly efficient rectennas at 24GHz and 60GHz. We also fabricated conventional rectennas which use a capacitor as an output filter, and compared the efficiency of class-F load rectennas with that of capacitor rectennas. We selected the diode which can produce high efficiency even at high frequency,...
We need electricity to use wireless information. If we reduce amount of batteries or electrical wires with a wireless power transmission technology via microwave (MPT), it is a green communication system. We Kyoto University propose a Fixed Wireless Access (FWA) system with the MPT with NTT, Japan. In this paper, we show mainly development results of 24GHz rectennas, rectifying antenna, for FWA. We...
This paper proposed a broadband and compact 3-dB MMIC edge-coupled directional coupler. The proposed coupler consists of eight stepped-impedance coupled sections and a tiny capacitor. The capacitor is constructed by using the MIM capacitor process and is located on the center of the coupler. The capacitor and stepped structure effectively realize 3-dB coupling and enhanced amplitude/phase characteristics...
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