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永磁同步电动机直接转矩控制系统
永磁同步电动机直接转矩控制(DTC)技术是20世纪90年代发展起来的一项重要电机调速技术,本书详细介绍了作者在三类永磁同步电动机(正弦波永磁同步电动机、无刷直流电动机、永磁容错电动机)直接转矩控制技术方面所作的研究成果。本书建立了正弦波永磁同步电动机DTC系统的理论构架;澄清了无刷直流电动机、永磁容错电动机DTC系统中的一些模糊概念,初步理顺了它们的DTC技术研究思路,为建立它们的DTC理论构架打下了可靠的基础。永磁同步电动机DTC技术可广泛应用于永磁同步电动机的调速系统和新能源技术中,如电动汽车、电气列车、城市轨道交通列车(地铁、轻轨)等的驱动系统和工业伺服系统、各类调速系统、风力发电系统等
- 2021-05-07下载
- 积分:1
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电动车控制器原理图(无刷直流电机)
【实例简介】电动车控制器原理图(无刷直流电机),采用PIC系列单片机以及mos管!
- 2021-11-17 00:32:03下载
- 积分:1
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温湿度传感器DHT11读写Verilog驱动源码Quartus工程文件.zip
【实例简介】温湿度传感器DHT11读写Verilog驱动源码Quartus工程文件,FPGA读取DHT11温度湿度数据并通过数码管显示输出,FPGA型号Cyclone4E系列中的EP4CE10F17C8,Quartus版本18.0。
module top_dht11(
input sys_clk , //系统时钟
input sys_rst_n, //系统复位
inout dht11 , //DHT11总线
input key , //按键
output [5:0] sel , //数码管位选信号
output [7:0] seg_led //数码管段选信号
);
//wire define
wire [31:0] data_valid;
wire [19:0] data ;
wire [5:0] point ;
//*****************************************************
//** main code
//*****************************************************
//dht11驱动模块
dht11_drive u_dht11_drive (
.sys_clk (sys_clk),
.rst_n (sys_rst_n),
.dht11 (dht11),
.data_valid (data_valid)
);
//按键消抖模块
key_debounce u_key_debounce(
.sys_clk (sys_clk),
.sys_rst_n (sys_rst_n),
.key (key),
.key_flag (key_flag),
.key_value (key_value)
);
//按键控制温/湿度显示
dht11_key u_dht11_key(
.sys_clk (sys_clk),
.sys_rst_n (sys_rst_n),
.key_flag (key_flag),
.key_value (key_value),
.data_valid (data_valid),
.data (data),
.sign (sign),
.en (en),
.point (point)
);
//动态数码管显示模块
seg_led u_seg_led (
.clk (sys_clk),
.rst_n (sys_rst_n),
.seg_sel (sel),
.seg_led (seg_led),
.data (data),
.point (point),
.en (en),
.sign (sign)
);
endmodule
- 2021-12-15 00:40:59下载
- 积分:1
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简易信号发生器proteus仿真(频率、幅度可调),四种波形输出,附带c程序源码(淘宝买来的)
诸位,这个文件是我从淘宝花了五十多买下来的,绝对好使。 功能是一种简易信号发生器(频率(从1-100hz)、幅度可调(5v之内)),四种波形输出(正弦波 三角波 方波 锯齿波),附带proteus仿真以及c文件。 然后程序都有代码的注释,需要改频率调节的可以直接去改就行,都好使呢。 拿这个做毕设,做论文,写仿真,都是可以的呢。
- 2020-11-28下载
- 积分:1
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matlab 转stl格式文件
此文件可以将matlab中的的三维图形转换成stl格式输出,同时附带你demo实例
- 2020-12-12下载
- 积分:1
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sqsx免费代理0.4 beta5
免费的好用的代理 版本0.4 beta5
- 2021-05-06下载
- 积分:1
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华中科技大学2017级课程设计(课程设计报告、数独).zip
【实例简介】华中科技大学2017级C语言和数据结构课程设计(基于SAT的数独游戏设计)
- 2021-11-25 00:44:00下载
- 积分:1
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OFDMA System Analysis and Design
OFDMA系统分析与设计的国外经典教材Chapter 1 Introduction to OFDM and OFDMAChapter 2 Characterization of the Mobile Wireless ChannelChapter 3 Fundamentals of Digital Communications and NetworkingChapter 4 Fundamentals of OFDM and OFDMA: Transceiver StructureChapter 5 Physical Layer: Time and FrequencyChapter For a listing of recent titles in theArtech House Mobile Communications Library,turn to the back of this bookOFDMA System Analysis and DesignSamuel C. YangARTECHHOUSEBOSTON LONDONartechhouse. comLibrary of Congress Cataloging-in-Publication DataA catalog record for this book is available from the U.S. Library of CongressBritish Library cataloguing in Publication DataA catalogue record for this book is available from the british libraryISBN-13:978-1-60807-076-3Cover design by vicki KaneC 2010 Artech House685 Canton streetNorwood. MA 02062All rights reserved. Printed and bound in the United States of America. No partof this book may be reproduced or utilized in any form or by any means, elec-tronic or mechanical, including photocopying, recording, or by any informationstorage and retrieval system, without permission in writing from the publisherAll terms mentioned in this book that are known to be trademarks or servicemarks have been appropriately capitalized artech House cannot attest to theaccuracy of this information. Use of a term in this book should not be regardedas affecting the validity of any trademark or service mark10987654321To my beautiful wife JennyContentsPrefaceAcknowledgmentsXVCHAPTER TIntroduction to ofdm and ofdma1.1 Motivation1.2 Conventional FDm1.3 Advantages of FDm1.3.1 Intersymbol Interference(ISI)and Multipath Fading1.3.2 Modulation and Coding per Subcarrier1.3.3 Simple equalization1.4 Disadvantages of FDM1.5 Basics of ofdm1.6 Advantages of OFDM1.6.1 Low-Complexity modulation1.6.2 Spectral Efficiency1.7 Basics of ofdma1.8 Advantages of OFDMA121.9 Some Practical issues of ofdm and ofdma1.9.1 Time Domain: Interblock Interference131.9.2 Frequency Domain: Intercarrier Interference131.10 OFDM and Dsss141.11 Overview of the book14References15Selected BibliographyCHAPTER 2Characterization of the mobile wireless channel2.1 Introduction2.2 Link analysis2.3 Distance Dimension: Propagation Loss2.3.1 Path Loss2.3.2 Shadowing Loss24Contents2.3.3 Multipath Fading26Example 2.1282.3.4 Concluding Remarks292.4 Time Dimension: Multipath Delay Spread302.4.1 Delay Spread30Example 2.231Example 2.3312. 4.2 Coherence bandwidth322.4.3 Implications for OFDM352.5 Frequency Dimension: Doppler Spread362.5.1 Doppler Spread36Example 2. 4372.5.2 Coherence time2.5.3 Implications for OFDM402. 6 Conclusions41References43Selected Bibliography44ChAPTER 3Fundamentals of Digital Communications and Networking453.1 Introduction453.2 Basic Functions of a Transceiver453.3 Channel Coding473.3.1 Linear block codes473.3.2 Convolutional codes493.4 Symbol mapping and modulation3.5 Demodulation563. 5. 1 Matched Filter563.5.2 Symbol Error3.6 Adaptive Modulation and Coding603.7 Cyclic Redundancy Check(CRC)623.8 Automatic Repeat Request(arQ)643.8.1 Stop-and-Wait ARQ643.8.2 Sliding Window arQ653.9 Hybrid ARQ67References69Selected bibliographyCHAPTER 4Fundamentals of ofdm and ofdma: transceiver structure4.1 Basic Transmitter functions714.2 Time domain: guard time4.3 Frequency Domain: Synchronization744.4 Basic receiver functions754.5 Equalization764.6 OFDM Symbol79Contents4.7 OFDMA Transmitter844. 8 OFDMA Receiver4.9 OFDMA4.9.1 Frequency diversity4.9.2 Multiuser diversity914.9.3 Concluding Remarks4.10 Peak-to-Average Power ratio924.11 Conclusions93References94Selected Bibliography95CHAPTER 5Physical Layer: Time and Frequency975.1 Introduction5.2 Distributed Subcarrier Permutation: Forming Subchannels onDownlink5.2.1 Full Usage of Subchannels(FUSC1005.2.2 Partial Usage of Subchannels(PUSC)1015.2.3 Tile Usage of Subchannels 1(TUSC1)1025.2.4 Tile Usage of Subchannels 2(TUSC2)1025.3 Distributed Subcarrier Permutation: Forming Subchannels on Uplink 1025.3.1 Partial Usage of Subchannels(PUSC)1035.3.2 Optional Partial Usage of Subchannels(Optional PUSC)1035.4 Adjacent Subcarrier Permutation: Downlink and Uplink1045.5 Summary of Subcarrier Permutation Modes1045.6 Bursts and Permutation Zones1055.7 Subframes and frames1075.7.1 Preamble1105.7.2 Frame Control Header(FCH)1105.7.3 Downlink MAP (DL-MAP)and Uplink MAP(UL-MAP1115. 8 TDD and FDD5. 9 System Design Issues1125.9.1 Frequency Diversity and multiuser diversity1125.9.2 Segmentation1125. 10 Adaptive burst profiles1155.10.1 Burst Profiles1155.10.2 Channel Quality Feedback116References117ChAPTER 6Physical Layer: Spatial Techniques1196.1 Introduction6.2 Spatial Diversity: Receive Diversity1206.2.1 Receive Diversity: Antenna Selection1226.2.2 Receive Diversity: Maximal Ratio Combining6.3 Spatial Diversity: Transmit Diversity123Contents6.3. 1 Transmit Diversity: Open-Loop 2 X 11246.3.2 Transmit Diversity: Open-Loop 2X 21266.3.3 Transmit Diversity: Closed-Loop Antenna Selection128Example 6.11296.3.4 Transmit Diversity: Closed-Loop precoding1306.3.5 Remarks1326.4 Spatial Multiplexing1336.5 MIMO-OFDM1366.6 Beamforming1366.7 System Design Issues139References140Selected Bibliography141CHAPTER 7Medium Access control: architecture and data plane1437.1 MAC Architecture1437.2 Convergence Sublayer1457. 2.1 Address Mapping( Classification1467. 2.2 Header Suppression1467. 3 Common Part Sublayer1477.3.1ARQ1477. 3.2 MAC SDU and MAc pdu1487.3.3 Fragmentation/Packing1497.4 Security Sublayer152References152chaPTeR 8Medium Access Control Lower Control plane1538. 1 Introduction1538.2 Scheduler1538.3 Bandwidth Request1558.3.1 Request in Existing Uplink Allocation1568.3.2 Unicast Polling1568.3.3 Multicast and Broadcast Polling1578.3.4 Contention-Based Request for OFDMA1578.4 Control Signaling1588.5 Ranging1598.5.1 Initial Ranging1598.5.2 Periodic Ranging1608.5.3 Handover ranging1618.6 Power Control1618.6.1 Uplink Power Control: Closed-Loop1648.6.2 Uplink Power Control: Open-Loop1668.6.3 Assignment of Uplink Modulation and Coding8.6.4 Concluding Remarks168References169ContentsChaPTER 9Medium Access Control: Upper Control plane1719.1 Introduction1719.2 Network Entry1719.2. 1 Synchronization with Downlink of Base Station and acquisitionof parameters1739.2.2 Initial Ranging1739. 2.3 Negotiation of Mobile Capabilities1749.2.4 Security Procedures1749.2.5 Mobile registration1759.2.6 IP Connectivity1759.2.7 Connection Setup1769.3 Mobility Management: Link Handover1769.3.1 Cell Reselection1779.3.2 Hard Handover(HHO1799.3.3 Macro Diversity Handover(MDHO)1849.3.4 Fast Base Station Switching(FBSS1879.3.5 System Design Issue: H Add and h delete1899.3.6 Concluding Remarks1919.4 Mobility management: Network handover192References192CHAPTER 10Quality of Service(Qos)19510.1 Introduction19510.2 Definitions and Fundamental Concepts19510.2.1 Service Flows and Qos Parameters19510.2.2 Connections19610.3 Object Relationship Model19710.4 Service flow transactions19910.4.1 Creating a Service Flow19910.4.2 Changing a Service Flow20010.4.3 Deleting a Service Flow20310.5 QoS Parameters20410.6 Scheduling Services20610.6.1 Unsolicited Grant Service(UGS)20610.6.2 Real-Time Polling Service(rtPS20710.6.3 Extended Real-Time Polling Service(ertPS20710.6.4 Nonreal-Time Polling Service(nrtPS20810.6.5 Best Effort(BE)20810.6.6 Remarks209References210
- 2020-11-30下载
- 积分:1
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VS2010之MFC串口通信的编写教程
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- 2020-12-02下载
- 积分:1
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PID电机控制
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- 2020-12-12下载
- 积分:1