Experimental High Speed/Power Ratio ASIC Designs Using Residue Numbers

1990 ◽  
Author(s):  
A. Simoneau ◽  
J. Pizarro ◽  
A. Parker
Keyword(s):  
High Speed ◽  
Power Ratio ◽  
Residue Numbers

scholarly journals A Novel Hybrid Precoding-Companding Technique for Peak-to-Average Power Ratio Reduction in 5G and beyond

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1410
Author(s):  
Mohamed Mounir ◽  
Mohamed B. El_Mashade ◽  
Salah Berra ◽  
Gurjot Singh Gaba ◽  
Mehedi Masud
Keyword(s):  
Computational Complexity ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Average Power ◽  
Papr Reduction ◽  
Power Ratio ◽  
Error Vector Magnitude ◽  
Hybrid Precoding ◽  
High Power Amplifier ◽  
Reduction Techniques

Several high-speed wireless systems use Orthogonal Frequency Division Multiplexing (OFDM) due to its advantages. 5G has adopted OFDM and is expected to be considered beyond 5G (B5G). Meanwhile, OFDM has a high Peak-to-Average Power Ratio (PAPR) problem. Hybridization between two PAPR reduction techniques gains the two techniques’ advantages. Hybrid precoding-companding techniques are attractive as they require small computational complexity to achieve high PAPR reduction gain. Many precoding-companding techniques were introduced to increasing the PAPR reduction gain. However, reducing Bit Error Rate (BER) and out-of-band (OOB) radiation are more significant than increasing PAPR reduction gain. This paper proposes a new precoding-companding technique to better reduce the BER and OOB radiation than previous precoding-companding techniques. Results showed that the proposed technique outperforms all previous precoding-companding techniques in BER enhancement and OOB radiation reduction. The proposed technique reduces the Error Vector Magnitude (EVM) by 15 dB compared with 10 dB for the best previous technique. Additionally, the proposed technique increases high power amplifier efficiency (HPA) by 11.4%, while the best previous technique increased HPA efficiency by 9.8%. Moreover, our proposal achieves PAPR reduction gain better than the most known powerful PAPR reduction technique with a 99% reduction in required computational complexity.

SPWM Fed Induction Motor Drive Performance Using SIMULINK

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Singampalli Hema ◽  
Singampalli Hema ◽  
Singampalli Hema ◽  
Singampalli Hema
Keyword(s):  
Induction Motor ◽  
Electric Vehicles ◽  
High Speed ◽  
Fossil Fuels ◽  
Pulse Width Modulation ◽  
Power Ratio ◽  
Dc Motors ◽  
Speed Range ◽  
Single Phase Inverter ◽  
Ac Induction Motor

In the former times, IC engines were used for transportation by most of the vehicles. But due to the depletion of fossil fuels day to day, the world is moving towards the Electric Vehicles (EVs) to overcome this problem. Electric Vehicles have higher efficiency and weight/power ratio. In general, DC motors were used in electric vehicles. The DC motors could not meet the requirements of customer needs because of its low speed range. In the recent studies, an AC Induction motor has several advantages over DC motors because of its robustness, high speed range, and efficiency and weight/power ratio. This paper presents the performance analysis of AC Induction motor when fed with the Single-Phase Inverter. The gate pulses are given by using Sinusoidal Pulse Width Modulation (SPWM) technique. The results are then compared with the performance of DC motor using MATLAB/SIMULINK.

Research on Peak-to-Average Power Ratio for OFDM System

2013 ◽  
Vol 823 ◽  
pp. 366-369
Author(s):  
Hao Fang ◽  
Wan Hua Wei
Keyword(s):  
High Speed ◽  
Data Flow ◽  
Average Power ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Ofdm System ◽  
Major Drawback ◽  
High Power Amplifier ◽  
Flow Through ◽  
Ofdm Signals

OFDM is a special multi-carrier modulation, its basic idea is to make high-speed transmission of data flow through the serial-parallel conversion and make it to be the low-speed transmission of data flow in a number of narrow-band orthogonal sub-channels. However, a major drawback of OFDM signals is their high Peak-to-Average Power Ratio (PAPR), which makes the inter modulation distortion occur due to the nonlinearity of the high power amplifier. The distortion severely deteriorates the performance of the OFDM systems. According the problems mentioned above, this dissertation focuses on the reducing the PAPR algorithms design for OFDM systems, such as SLM and PTS. In summary, this paper has completed the OFDM system simulation with Matlab and analyses the result.

scholarly journals Investigating the Impact of Power-Take-Off System Parameters and Control Law on a Rotational Wave Energy Converter’s Peak-to-Average Power Ratio Reduction

2020 ◽  
Author(s):  
H. Bora Karayaka ◽  
Yi-Hsiang Yu ◽  
Nathan Tom ◽  
Eduard Muljadi
Keyword(s):  
Wave Energy ◽  
High Speed ◽  
High Efficiency ◽  
Average Power ◽  
Gear Ratio ◽  
Irregular Waves ◽  
Strong Impact ◽  
Power Ratio ◽  
Hardware In The Loop ◽  
The Impact

Abstract Due to the irregular nature of real waves, the power captured in a wave energy converter (WEC) system is highly variable. This is an important barrier to the effective use of WECs. To address this challenge, this study focuses on a rotational WEC power-take-off system in which high-speed and high-efficiency generators along with a torque/power smoothing inertia element can be effectively utilized. In the first phase of this study, the U.S. Department of Energy’s reference model 3 (WEC-Sim RM3; two-body point absorber), along with a slider-crank WEC, were integrated for linear to rotational conversion. Relative motion between the float and spar in RM3 was the driving force for this slider-crank WEC, which is connected to a motor/generator set through a gearbox. RM3 geometry was scaled down by 25 times to work within the limits of the physical motor/generator set used in the experimentation. Once the integration in a hardware-in-the-loop simulation environment was successfully completed, data on the peak-to-average power ratio was collected for various wave conditions including regular and irregular waves. The control algorithm designed to keep the system in resonance with waves was able to maintain relatively high speed depending on the specific gear ratio and wave period. Initial results with hardware-in-the-loop simulations reveal that gear ratio and crank radius have a strong impact on the peak-to-average power ratio. In addition, it was found that output power from the generator was maximized at a larger gear ratio, as the crank radius was increased.

Fluid-Film Journal Bearings Operating in a Hybrid Mode: Part I—Theoretical Analysis and Design

1981 ◽  
Vol 103 (4) ◽  
pp. 558-565 ◽  
Author(s):  
D. Koshal ◽  
W. B. Rowe
Keyword(s):  
High Speed ◽  
Journal Bearings ◽  
Hydrodynamic Performance ◽  
Total Power ◽  
Theoretical Treatment ◽  
Power Ratio ◽  
Eccentricity Ratio ◽  
Analysis And Design ◽  
System A ◽  
Wide Range

Oil-lubricated plain hybrid journal bearings have been investigated theoretically and experimentally to determine the hybrid (hydrostatic/hydrodynamic) performance. The paper consists of two parts: Part I deals with the theoretical treatment of results, and Part II describes the experimental investigation. It is demonstrated that when two rows of inlet lubricant sources are employed in a plain hybrid bearing, greater load-carrying capacity is obtained by positioning the entries near the ends of the bearing rather than at the center or at quarter stations. These results extend previous work by presenting data for a wide range of power ratio (K). The parameter K is defined as the ratio of friction power to pumping power. Increasing K has the same effect as increasing speed for a particular bearing system. A new basis for optimizing hybrid bearings is described. The bearings to be optimized are compared with a reference bearing, on a basis of load/total power; a technique which is not required in other bearings where load does not increase rapidly with power ratio. Plain hybrid bearings are compared with conventional recessed hydrostatic journal bearings and with axial groove hydrodynamic journal bearings. It is found that plain hybrid bearings are superior in performance to recessed journal bearings at low eccentricity ratio and low speed. Also plain hybrid bearings are comparable to axial groove hydrodynamic journal bearings at a high eccentricity ratio and high speed with advantages for variable directions of loading. Furhermore the hydrostatic effect tends to raise the whirl onset speed.

scholarly journals Algorithm for Decreasing the Large Peak to Average Power Ratio in Mimo-Ofdm

2020 ◽  
Vol 8 (6) ◽  
pp. 2272-2276
Keyword(s):  
Error Rate ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Average Power ◽  
Symbol Error Rate ◽  
Power Ratio ◽  
Mapping Algorithm ◽  
Mimo Ofdm ◽  
Large Maximum

Every personal want to use high speed communication system but bandwidth is limited and users are unlimited in that case some of technologies are use for improving speed. One of the best technology called multiple inputs multiple outputs orthogonal frequency division multiplexing. Which provides very fast communication system but drawback of this technique is large maximum to average power ratio, these reduce efficiency of power amplifier. In this article developed new algorithm, for reduction of large maximum to average power ratio and improve bit or symbol error rate in MIMO-OFDM system. Proposed technique, called filter companding selected mapping algorithm technique (FC-SLM) to reduce PAPR using filtering and companding concept. In this techniques, after modulation of input data are converted into serial to parallel steam, phase mapping of all data from 0 to 360 degrees and perform IFFT operation, calculate PAPR and pass through desire range of filter and select minimum PAPR then perform companding and transmitted through an antenna. This scheme is reduce 2.3 dB PAPR and improve bit or symbol error rate. This is one of the most excellent promising techniques for next generation (5-G) communication system.

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