Adaptive resource allocation can drastically increase the throughput of an Orthogonal Frequency Division Multiple Access (OFDMA) system when the Channel State Information (CSI) is accurately known. Unfortunately, in practice, perfect CSI is rarely possible. In this paper, we consider adaptive subcarrier assignment for downlink multiuser OFDMA systems, where the transmitter has no knowledge of t...

Due to the potential benefits resulting from the use of more than the conventional three phases in transmission, some interest has also grown in the area of multi-phase (phase order more than three) machines in recent years. Multi-phase loads particularly in the form of inverter fed induction motor drives suited to high power and specialized applications, are receiving growing attention in the ...

Proposed and existing power-control systems for directsequence CDMA cellular networks measure instantaneous power, whereas theoretical analyses almost always assume long-term-average or local-mean power control. In this paper, the distinction between the two types of power control is clarified. The outage probability for direct-sequence CDMA systems using instantaneous power control is derived....

Torque ripple is a defect of switched reluctant motors. DITC (direct instantaneous torque control) harnessed to solve the problem as traditional method, which superior TSF (torque sharing function). In this paper, new controller proposed with modified hysteresis and PWM in DITC. With algorithm, error will be reduced The algorithm effective improve sample 0 status period. based on application ze...

Modern communication signals have time-varying envelopes with significant peak-to-average ratios, resulting in low average efficiency when amplified by commonly used linear power amplifiers (PAs). For linear amplification with increased average efficiency, the Kahn envelope-elimination-and-restoration method uses a highly efficient saturated PA. In this paper, an 8.4-GHz class-F PA with 55% max...

Most of the pollution issues created in power systems are due to the non-linear characteristics and fast switching of power electronic equipment. Power quality issues are becoming stronger because sensitive equipment will be more sensitive for market competition reasons, equipment will continue polluting the system more and more due to cost increase caused by the built-in compensation and somet...

This paper proposes a shunt active filter (SAF) for harmonic mitigation and reactive power compensation in an induction heating (IH) system. The high-frequency switching the resonant inverter of IH system generates considerable number harmonics. latter flow back to supply side causes wide variety problems. predominant ones are deterioration quality, distortion grid voltage, malfunctioning prote...