This paper presents efficient processing engines for software-defined radio(SDR)front-ends.These engines,based on a polyphase channelizer,perform arbitrary sample-rate changes,frequency selection,and bandwidth control...This paper presents efficient processing engines for software-defined radio(SDR)front-ends.These engines,based on a polyphase channelizer,perform arbitrary sample-rate changes,frequency selection,and bandwidth control.This paper presents an M-path polyphase filter bank based on a modified N-path polyphase filter.Such a system allows resampling by arbitrary ratios while performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate.This resampling technique is based on sliding cyclic data load interacting with cyclic-shifted coefficients.A non-maximally-decimated polyphase filterbank(where the number of data loads is not equal to the number of M subfilters)processes M subfilters in a time period that is less than or greater than the M data loads.A polyphase filter bank with five different resampling modes is used as a case study for embedded resamp/ing in SDR front-ends.These modes are(i)maximally decimated,(ii)Under-decimated,(iii)over-decimated,and combined up-and down-sampling with(iv)single stride length,and(v)multiple stride lengths.These modes can be used to obtain any required rational sampling rate change in an SDR front-end based on a polyphase channelizer.They can also be used for translation to and from arbitrary center frequencies that are unrelated to the output sample rates.展开更多
This paper presents a techno-economic investigation of an integrated rooftop solar PV system for typical home applications in Oman that can reduce the power consumption from the grid and export excess PV generated pow...This paper presents a techno-economic investigation of an integrated rooftop solar PV system for typical home applications in Oman that can reduce the power consumption from the grid and export excess PV generated power back to the gird.Since renewable energy systems design technically depends on the site,this study selects a typical two-story villa(Home),in a site Al-Hamra,Oman.Temperature is one of the critical parameters in this design as it varies widely over the day and from one season to another in Oman.With the effect of temperature variation,the PV system has designed using system models for the required load of the home.The design process has included two main design constraints,such as the available rooftop space and the grid-connection availability for the selected home.This research also evaluates the economic feasibility of the design system considering the energy export tariff as per the Bulk Supply Tariff(BST)scheme in Oman.The design outcome reveals that the designed PV system can supply the load energy requirement in a year.In addition,the rooftop solar PV system can sell surplus energy back to the grid that generates additional revenue for the owner of the system.The economic performance indices such as payback period,internal rate of return,net present value,and profitability index ensure the financial feasibility of the designed rooftop solar PV system for the selected home.展开更多
文摘This paper presents efficient processing engines for software-defined radio(SDR)front-ends.These engines,based on a polyphase channelizer,perform arbitrary sample-rate changes,frequency selection,and bandwidth control.This paper presents an M-path polyphase filter bank based on a modified N-path polyphase filter.Such a system allows resampling by arbitrary ratios while performing baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate.This resampling technique is based on sliding cyclic data load interacting with cyclic-shifted coefficients.A non-maximally-decimated polyphase filterbank(where the number of data loads is not equal to the number of M subfilters)processes M subfilters in a time period that is less than or greater than the M data loads.A polyphase filter bank with five different resampling modes is used as a case study for embedded resamp/ing in SDR front-ends.These modes are(i)maximally decimated,(ii)Under-decimated,(iii)over-decimated,and combined up-and down-sampling with(iv)single stride length,and(v)multiple stride lengths.These modes can be used to obtain any required rational sampling rate change in an SDR front-end based on a polyphase channelizer.They can also be used for translation to and from arbitrary center frequencies that are unrelated to the output sample rates.
文摘This paper presents a techno-economic investigation of an integrated rooftop solar PV system for typical home applications in Oman that can reduce the power consumption from the grid and export excess PV generated power back to the gird.Since renewable energy systems design technically depends on the site,this study selects a typical two-story villa(Home),in a site Al-Hamra,Oman.Temperature is one of the critical parameters in this design as it varies widely over the day and from one season to another in Oman.With the effect of temperature variation,the PV system has designed using system models for the required load of the home.The design process has included two main design constraints,such as the available rooftop space and the grid-connection availability for the selected home.This research also evaluates the economic feasibility of the design system considering the energy export tariff as per the Bulk Supply Tariff(BST)scheme in Oman.The design outcome reveals that the designed PV system can supply the load energy requirement in a year.In addition,the rooftop solar PV system can sell surplus energy back to the grid that generates additional revenue for the owner of the system.The economic performance indices such as payback period,internal rate of return,net present value,and profitability index ensure the financial feasibility of the designed rooftop solar PV system for the selected home.
