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In this study, we introduce an efficient dual-band polar transmitter architecture to reduce the required bandwidth of phase-modulated signal for polar transmitter. We derive a time-domain expression of dual-band band-pass signal, and show comparison of receiving signal-to-noise performance between the conventional polar transmitter and the proposed scheme. Simulation results show two-stage digital...
In this study, we briefly introduce a novel concept of dual-band polar transmitter design based on digital quadrature modulation techniques for the application of railroad wireless communication (e.g., TRS & GSM-R) to reduce the bandwidth of dual-band PM (phase modulation) signal. We show that the complex signal processing at low frequency effectively utilizes the polar transmitter which is susceptible...
In this paper, we show that the dimension of BS-MIMO system can be increased according to the extension of structure of the ESPAR antenna. For example, we show that it is possible to design the 7×7 BS-MIMO transmissions with the 13-element ESPAR antenna. MIMO dimension is expanded by one, when the number of parasitic elements of ESPAR antenna increases by two elements.
In this paper, we propose a self-interference cancellation system using LN DDMZM (Lithium Niobate Dual Drive Mach Zehnder Modulator). Self-interference cancellation is main issue in Full-Duplex system. Conventional Full-Duplex system is studied over Analog and Digital domain. But recently work says that significant portion of full duplex self-interference cancellation relies on analog domain techniques...
In this paper, we design SSD (simultaneous single band duplex) system using RF (radio frequency) cancellation and digital cancellation. We analyze characteristic of residual self-interference after RF Cancellation signal when error of phase shifter occur in RF cancellation. When phase shifter error of 0°, 0.5°, 1° and 2° occur in RF cancellation, residual self-interference signal power after RF cancellation...
It is known that the main limitation of implementing the multiple input multiple output (MIMO) system is the complexity and high cost of the hardware in the RF section. In this paper, an approach of using time division multiplexing (TDM) with a MIMO receiver to reduce the power consumption and cost of the multiple antenna RF chains is proposed and evaluated. By using the TDM technique, our proposed...
Conventional MIMO (multiple input multiple output) system is required to a number of RF chains as much as a number of antennas. If a number of antennas increased then a number of RF chains increased. Therefore, it is difficult to apply conventional MIMO system to mobile terminals with limited power. In this paper, we propose a TDM (time division multiplexing)-based single RF chain MIMO system. The...
In downlink orthogonal frequency division multiple access (OFDMA) systems, available subcarriers are divided into groups and assigned to multiple uses for simultaneous transmissions. The ideal universal receiver sampling the incoming signals just after a RF stage is very seducing but not realistic at this time due to limitations in sampling capabilities for high frequency systems. Software-defined...
Using a variety of digital modulation schemes for mobile communication technology, and despite the fact that these are serviced, the radiated immunity test based on IEC 61000-4-3 only has been performed using AM signal. In this study, we had performed the radiated immunity test using the digital modulation signals and an AM signal, and had investigated the impact of digitally modulated signals. The...
Wireless communication and mobile computing devices are using the wildly. These devices basically work in battery power. It is very important to calculate and apply the power consumption and furthermore to develop nice feasible techniques for reducing the power consumption of wireless communication devices. RF and analog parts in the mm-wave and EHF frequency domain typically consume more energy compared...
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