منابع مشابه
application of upfc based on svpwm for power quality improvement
در سالهای اخیر،اختلالات کیفیت توان مهمترین موضوع می باشد که محققان زیادی را برای پیدا کردن راه حلی برای حل آن علاقه مند ساخته است.امروزه کیفیت توان در سیستم قدرت برای مراکز صنعتی،تجاری وکاربردهای بیمارستانی مسئله مهمی می باشد.مشکل ولتاژمثل شرایط افت ولتاژواضافه جریان ناشی از اتصال کوتاه مدار یا وقوع خطا در سیستم بیشتر مورد توجه می باشد. برای مطالعه افت ولتاژ واضافه جریان،محققان زیادی کار کرده ...
15 صفحه اولPower loading for CP-OFDM over frequency-selective fading channels
In this paper we compare cyclic prefix (CP) based single and multicarrier block transmission schemes in frequencyselective fading channels. Analytical comparison shows that at moderate-to-high signal-to-noise ratio (SNR), the uncoded error rate performance of multicarrier transmission is inferior to that of single carrier. We propose new minimum bit error rate (MBER) power loading algorithms fo...
متن کاملWhen Does Unequal Power-loading Make Sense?
In Orthogonal Frequency Division Multiplexing (OFDM) unequal power-loading, i.e. water-filling, is used to selectively assign power to each subcarrier, thus maximizing the capacity for a fixed power-budget. Unequal power-loading is used successfully in applications such as digital subscriber lines (DSL), where the channel effectively acts as a time-invariant low-pass filter. In such conditions,...
متن کاملCalculation of Power System Critical Loading Conditions
The paper considers the problem of nding points of maximum loadability which are closest (in a local sense) to the power system operating point. This optimization problem leads to a set of equations which describe such critical points. Not all solutions of this set of equations are critical points. The paper therefore explores the nature and characteristics of solutions. A two stage algorithm i...
متن کاملPower- and Bit-Loading Algorithms for Multitone Systems
Optimal powerand bit-loading in a multitone system requires prohibitive nonlinear programming. A useful nearoptimal solution has previously been proposed which imposes a uniform error probability distribution across the tones. In this paper, we examine two alternative nearoptimal solutions and offer a comparison with the existing solutions. The first imposes uniform power across the used tones ...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/293421c0