In future cellular system, it is becoming more challenging to optimize the radio resource management and maximize the system capacity whilst meeting the required quality of service from user's point of view. Traditional schemes have approached this problem mainly focusing on resources within a cell and to large extent ignoring effects of multi-cell architecture. For multi-cell systems employing intra-cell orthogonal communication channels, inter-cell interference mitigation techniques are expected to be one of the key radio resource management functions. In this paper, we propose a multi-cell coordinated and un-coordinated dynamic resource sharing algorithms and reuse techniques among base station/ relay station cells. The sub carrier allocation and power allocation are performed on the basic of sum-rate maximization, by considering the load over the cell (3-sector cell). The simulation results show the performance comparison between both coordinated and un-coordinated Artifice Appropriation schemes with different sum-rate maximization algorithms.
This paper analysis the harmonics elimination and improve the power quality by using space vector modulation. The voltage  and current harmonics are produced by nonlinear loads that increase the power losses and a negative effect on electric utility supply systems and apparatus. This paper presents the application of Space Vector Pulse Width Modulation for shunt active power filters .The most important part of the active power filters is generating of gate signal for inverters to improve the power factor and to reduce current and voltage distortion to standard limits. The simulation results through Matlab shows that the output of the effective current compensation.
The voltage source full-bridge DC-AC converter with PWM technique using a step down Cycloconverter is implemented. The zero-voltage switching (ZVS) commutation for full-bridge high frequency inverter active power switches and the Cycloconverter bi-directional switches are obtained. Soft switching operation is provided in a wide range of voltage regulation without utilizing an auxiliary inductor in the primary side of an isolating transformer. The transformer size and filter components value is reduced by using high frequency inverter. Therefore switching losses in the circuit can be reduced and output voltage is regulated. Based on the simulation and experimental results, the steady-state operation principles of the converter are analyzed.