Joint Detection for a Bandwidth Efficient Modulation Method

2005 ◽  
pp. 483-487
Author(s):  
Zhonghui Mei ◽  
Lenan Wu ◽  
Shiyuan Zhang
Keyword(s):  
Modulation Method ◽  
Joint Detection

Modulation Method for Improving Reliability of Multilevel T-Type Inverter in PV Systems

2020 ◽  
Vol 8 (2) ◽  
pp. 1298-1309 ◽  
Author(s):  
Mokhtar Aly ◽  
Emad M. Ahmed ◽  
Masahito Shoyama
Keyword(s):  
Modulation Method ◽  
Pv Systems

scholarly journals 5G Visible Light Communication - OCDMA Setup using Catenated-OFDM Modulation Method

2021 ◽  
Vol 1755 (1) ◽  
pp. 012016
Author(s):  
N. M. Nawawi ◽  
S. R. Abdullah ◽  
Aini Syuhada Md Zain ◽  
M. S. Anuar ◽  
M. N. Junita
Keyword(s):  
Visible Light ◽  
Visible Light Communication ◽  
Modulation Method ◽  
Ofdm Modulation

scholarly journals Application of Ultra Narrow Band Modulation in Enhanced Loran System

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4347
Author(s):  
Boyun Lyu ◽  
Yu Hua ◽  
Jiangbin Yuan ◽  
Shifeng Li
Keyword(s):  
Narrow Band ◽  
Data Rate ◽  
Modulation Method ◽  
Phase Shift Keying ◽  
Spectrum Utilization ◽  
Frequency Domains ◽  
Shift Keying ◽  
Modulation Methods ◽  
Binary Phase Shift Keying ◽  
Signal Time

The Enhanced Loran (eLoran) system is valued for its important role in the positioning, navigation, and timing fields; however, with its current modulation methods, low data rate restricts its development. Ultra narrow band (UNB) modulation is a modulation method with extremely high spectrum utilization. If UNB modulation can be applied to the eLoran system, it will be very helpful. The extended binary phase shift keying modulation in UNB modulation is selected for a detailed study, parameters and application model are designed according to its unique characteristics of signal time and frequency domains, and it is verified through simulation that the application of this modulation not only meets the design constraints of the eLoran system but also does not affect the reception of the respective signals of both parties. Several feasible schemes are compared, analyzed, and selected. Studies have revealed that application of UNB modulation in the eLoran system is feasible, and it will increase the data rate of the system by dozens of times.

scholarly journals Stacked Buck Converter: Current Ripple Elimination Effect and Transient Response

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 64
Author(s):  
Chien-Chun Huang ◽  
Yu-Chen Liu ◽  
Chia-Ching Lin ◽  
Chih-Yu Ni ◽  
Huang-Jen Chiu
Keyword(s):  
Transient Response ◽  
Dead Time ◽  
Control Method ◽  
Buck Converter ◽  
Modulation Method ◽  
Output Current ◽  
Time Modulation ◽  
Advantages And Disadvantages ◽  
Improvement Method ◽  
Current Ripple

To balance the cost and volume when applying a low output current ripple, the power supply design should be able to eliminate the current ripple under any duty cycle in medium and high switching frequencies, and considerably reduce filter volume to improve power density. A stacked buck converter was eventually selected after reviewing the existing solutions and discussing their advantages and disadvantages. A stacked buck converter is used as a basis to propose the transient response and output current ripple elimination effect, boundary limit control method, and low output ripple dead time modulation method to make individual improvements. The principle, mathematical derivation, small-signal model, and compensator design method of the improvement method are presented in detail. Moreover, simulation results are used to mutually verify the correctness and effectiveness of the improvement method. A stacked buck converter with 330-V input, 50-V output, and 1-kW output power was implemented to verify the effect of the low output current ripple dead time modulation. Experimental results showed that the peak-to-peak value of the output current ripple was reduced from 2.09 A to 559 mA, and the RMS value was reduced from 551 mA to 91 mA, thereby effectively improving the output current ripple.

A Research on Complex FastICA Algorithm Based UNB Signal Detection

2011 ◽  
Vol 219-220 ◽  
pp. 1584-1588
Author(s):  
Shi Kai Zhang
Keyword(s):  
Computer Simulation ◽  
Signal Detection ◽  
Cost Function ◽  
Communication Technology ◽  
Modulation Method ◽  
First Principle ◽  
Modulation Format ◽  
High Efficient ◽  
Fastica Algorithm ◽  
Potential Use

Spectrum is limited, in order to develop high efficient modem, Complex FastICA algorithm is studied about its potential use in UNB signal detection. First, principle of Complex FastICA is presented, kurtosis and cost function are analyzed, and realization of Complex FastICA is given; then, M-EBPSK modulation method is supposed as a kind of UNB modulation format, UNB-ICA model for UNB received signal with interference and noise is presented by analyzing the characteristics of M-EBPSK modulation; finally, computer simulation is done by using nosy UNB-ICA model based on Complex FastICA Algorithm, the experimental results show that Complex FastICA Algorithm can suppress the interference and improve detection BER in contrast to the traditional methods, it is hopeful that the method can be used in UNB communication technology.

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