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To extend an available period of wireless sensor networks, transmission power control is regarded as one of the promising schemes. In most of the previous studies on the transmission power control, it is assumed that a transmitter has power consumption of O(dm), where d and n denote a maximum communication distance and a pass loss factor. This assumption would substantially hold under the condition...
The dynamics of phase locked loops (PLLs) are heavily influenced by the right choice of the loop filter parameters. A new approach for determining these parameters to meet the specification of telecommunications standards optimally is presented in this paper. The most common optimization criterium is to minimize the integral error over time of the step response. In a telecommunications system, it...
In recent mobile communication systems, impairments in analog circuits cannot be disregarded due to achieving high performance. Errors in analog circuits consist of a distortion of a power amplifier(PA), gain and phase imbalance in a quadrature modulator (QMOD) and a quadrature demodulator (QDEMOD), dc offset, frequency offset, and so on. Because of high accuracy of compensation, many techniques of...
This paper introduces the design and the implementation of the 60 GHz amplifier MMICs and the module for the 60 GHz WPAN system with a RoF (radio-over-fiber) link. The MMICs were designed using ETRI's 0.12 mum GaAs PHEMT 4-inch process. The MCLFs (microstrip coupled line filters) compared with the MIM (metal-insulator-metal) capacitors have greater stability and less effect by the variation of fabrication...
Data acquisition for low cost digital-controlled adaptive analog predistortion of a power amplifier is discussed. The predistorted amplifier has a RF input that is a UMTS signal comprising one or two adjacent carriers. The predistortion corrects for memoryless distortion. The data acquisition system measures the complex gain of the predistorted amplifier as a function of the input envelope, creating...
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