This paper discusses the previous work done for Low voltage distribution system (LVDS) and High voltage distribution system HVDS distribution system in various research applications. It is observed that LVDS and HVDS have shown vast era of work applications in comparison other distribution networks of the power system. HVDS is one of the most effective ways of distribution system which controls &maintains the voltage stability in power system during distribution and transmission. Power flow capability & control, continuation power flow, line stability index, optimal control, dynamic & transient stability techniques are used with LVDS and HVDS to achieve voltage stability. In this paper various works of LVDS and HVDS is deeply studied and described that in various efficient manner they can used for distribution network.
Orthogonal frequency division multiplexing (OFDM) is a promising multicarrier modulation technique for high data rate communication. Unless, OFDM faces the peak-toaverage-power ratio (PAPR) problem that is a major drawback of multicarrier transmission system which leads to power inefficiency of high power amplifier (HPA) and also demands the large dynamic range of digital to analog converter (DAC) at the transmitter. A number of schemes have been proposed to reduce the PAPR problem. The Discrete Fourier Transform (DFT) Spreading is one of the scheme to reduce the PAPR Problem in OFDM system. This paper presents the DFT spreading technique to reduce the PAPR problem. The PAPR reduction capability of this technique is demonstrated by presenting simulation results of PAPR.
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