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This paper focuses on time-division (TD) relaying where a relay node (RN) separates the backhaul and access links with respect to time, and shows the user throughput performance of TD relaying against a blank subframe ratio (BSR) in an access link and transmission power for a RN. The average user throughput and the cell edge user throughput are described by system-level computer simulation. TD relaying...
This paper presents user throughput performance for several different types of small cells with optimized transmission power. System level computer simulation results such as average user throughput and the cell edge user throughput performance are provided for several different types of small cells. We show how to decide the transmission power for a pico evolved Node B on the basis of a path loss...
This paper presents error vector magnitude (EVM) impact on the transmission performance of OFDM using a higher order modulation scheme such as 256- and 1024-QAM by link-level simulations. BER performance is highlighted as parameters of coding rates for 256- and 1024-QAM in the presence of EVM degradation. Using these results, we clarify the relation of spectral efficiency and channel quality, such...
This paper presents a new type of heterogeneous network (HetNet) with the intention of achieving both good user throughput performance and lower system power consumption, which cooperatively controls both cell selection offset (CSO) on the cell range expansion (CRE) and the transmission power for pico-eNB (PeNB TP). Average user throughput and the cell edge user throughput are provided as parameters...
We have developed a new mobile phone-based safety support system for transmitting information of a wandering elderly person's location and the environmental sounds around that person. The system consists of a wearable sensor and a conventional desktop PC with Internet access acting as the server computer. The wearable sensor, which is attached behind the neck of the elderly person's shirt, is composed...
A daily living activity remote monitoring system has been developed for supporting solitary elderly people. The monitoring system consists of a tri-axis accelerometer, six low-power active filters, a low-power 8-bit microcontroller (MC), a 1GB SD memory card (SDMC) and a 2.4 GHz low transmitting power mobile phone (PHS). The tri-axis accelerometer attached to the subject's chest can simultaneously...
Space charge profile and consequent field strength profile were obtained by solving the continuity and Poisson's simultaneous equations. Experimental electron deposition curve and radiation-induced conductivity curve were used for calculation. The calculated results explained well the observed replacement current and electrical breakdown phenomena. Dose rate, dose, and temperature effects on charge...
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