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This study assessed whether acquiring firms achieve the objectives of mergers and acquisitions (M&A) that are presented in their press releases and financial statements. It examined the usefulness of disclosing the M&A objectives to investors by analysing a sample of 232 M&A conducted between Japanese firms. The findings show that disclosed M&A objectives regarding profitability, efficiency,...
Multi-input multi-output (MIMO) transmission with multiple antennas, which performs parallel transmission at the same time and frequency and enhances the channel capacity, has attracted attention. In the case of small mobile terminals, the limitation of spaces for the multiple antennas leads to degrade the improvement of the channel capacity in proportion to the number of the antennas. This paper...
MIMO channel emulation systems have been studied and developed to achieve the evaluation for the MIMO transmission technique of user equipments (UEs) with multiple antennas. The system can generate a multipath with a spatial signature by transmitting signals from multiple probe antennas set around the UE. The resolution of the emulated spatial distribution of the multipath is improved as the number...
This paper demonstrates the effectiveness of an adaptive impedance control for mobile terminals with MIMO antennas, which aims to improve the antenna performance in the usage environment, over an FDD-LTE (Frequency Division Duplex — Long Term Evolution) system through experimental measurement by using a developed prototype terminal. Measurement results verify the effectiveness of a proposed control...
This paper presents an adaptive impedance control of antennas on user equipment (UE) for a Long Term Evolution (LTE) system that supports MIMO reception in downlink and single antenna transmission in uplink. The proposed control method balances the performances of both links, duplexing with a frequency division duplex (FDD), without additional information from eNode B (eNB). In addition, computer...
In this paper, an omni-directional slim polarization diversity antenna for cellular system is designed. The vertical polarization antenna with substrate construction and the horizontal polarization antenna with cylindrical construction match well. The configuration of polarization diversity antenna is optimized by E-field distribution and high isolation more than 25dB is obtained. The diameter of...
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