EC20基于STM32F407 MQTT协议上传温度湿度数据到onenet 源程序代码 调试通过，可以使用
2019-12-25 11:11:31
5.75MB
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4g epc 核心网PS考试练习题，
一、单项选择题
1．当4G UE处于ECM_CONNECTED状态时，MME上维护的UE位置信息是：
A. CGI
B. TAI
C. Unknown
D. RAI
2．PCRF和PCEF之间的接口是什么？
A. S11
B. Gx
C. Rx
D. Gxc
3．以下哪个协议不需要在MME上支持？
A. S1AP
B. GTP-C
C. GTP-U
D. SGsAP
4．“永远在线”是4G的特点之一，这指的是当4G UE开机附着网络后，其哪段承载在开机状态下会始终存在？
A. S1接口承载
B. S5/S8接口承载
C. S10接口承载
D. S11 接口承载
5．4G网络中S1 Release过程会使得UE的状态变成：
A. ECM-IDLE
B. EMM-DEREGISTERED
C. ECM-CONNECTED
D. ESM-INACTIVE
6．在EPG-S中，主要用于存储和管理配置文件的分区是？
A. /p01
B. /p02
C. /md
D. /flash
7．在VoLTE中，EPC网络作为IMS的接入，负责与IMS网络进行通信的节点是：
A. MME
B. SGW
C. PGW
D. eNodeB
8．在SGSN-MME上进行截获数据包进行追踪的工具是？
A. EBM
B. 小区映射
C. ITC
D. 用户事件日志
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2019-12-22 20:10:10
20KB
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MT6735、MT6737、MT6753全模4G智能手机原理图dsn和brd格式
2019-12-21 22:18:31
4.34MB
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全面详解LTE：MATLAB建模、仿真与实现（Understanding LTE with MATLAB 中文版）分3个部分深入讲解了LTE标准的物理层（PHY）：关键核心技术的理论；简明扼要地讨论了LTE标准规范；用于仿真LTE标准所需的MATLAB算法。
MATLAB 作为《全面详解LTE：MATLAB建模、仿真与实现》一个鲜明的特点，通过一系列的程序，展现了每一个LTE的核心技术。通过一步步综合这些核心技术， 最终建立LTE物理层的系统模型并评价系统性能。通过这一循序渐进的过程，读者将会在仿真中深入理解LTE的技术构思和标准规范。
非常清晰，有完整目录，方便阅读，非常好的学习资料。
2019-12-21 22:06:40
91.14MB
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wily 2014 年新书 Understanding LTE with MATLAB
Contents
Preface xiii
List of Abbreviations xvii
1 Introduction 1
1.1 Quick Overview of Wireless Standards 1
1.2 Historical Profile of Data Rates 4
1.3 IMT-Advanced Requirements 4
1.4 3GPP and LTE Standardization 5
1.5 LTE Requirements 5
1.6 Theoretical Strategies 6
1.7 LTE-Enabling Technologies 7
1.7.1 OFDM 7
1.7.2 SC-FDM 8
1.7.3 MIMO 8
1.7.4 Turbo Channel Coding 8
1.7.5 Link Adaptation 9
1.8 LTE Physical Layer (PHY) Modeling 9
1.9 LTE (Releases 8 and 9) 11
1.10 LTE-Advanced (Release 10) 11
1.11 MATLAB?and Wireless System Design 11
1.12 Organization of This Book 11
References 12
2 Overview of the LTE Physical Layer 13
2.1 Air Interface 13
2.2 Frequency Bands 14
2.3 Unicast and Multicast Services 14
2.4 Allocation of Bandwidth 16
2.5 Time Framing 17
2.6 Time朏requency Representation 17
2.7 OFDM Multicarrier Transmission 20
2.7.1 Cyclic Prefix 21
2.7.2 Subcarrier Spacing 22
vi Contents
2.7.3 Resource Block Size 22
2.7.4 Frequency-Domain Scheduling 22
2.7.5 Typical Receiver Operations 23
2.8 Single-Carrier Frequency Division Multiplexing 23
2.9 Resource Grid Content 24
2.10 Physical Channels 25
2.10.1 Downlink Physical Channels 26
2.10.2 Function of Downlink Channels 27
2.10.3 Uplink Physical Channels 30
2.10.4 Function of Uplink Channels 30
2.11 Physical Signals 31
2.11.1 Reference Signals 31
2.11.2 Synchronization Signals 33
2.12 Downlink Frame Structures 34
2.13 Uplink Frame Structures 35
2.14 MIMO 35
2.14.1 Receive Diversity 36
2.14.2 Transmit Diversity 37
2.14.3 Spatial Multiplexing 38
2.14.4 Beam Forming 39
2.14.5 Cyclic Delay Diversity 40
2.15 MIMO Modes 40
2.16 PHY Processing 41
2.17 Downlink Processing 41
2.18 Uplink Processing 43
2.18.1 SC-FDM 44
2.18.2 MU-MIMO 44
2.19 Chapter Summary 45
References 46
3 MATLAB?for Communications System Design 47
3.1 System Development Workflow 47
3.2 Challenges and Capabilities 48
3.3 Focus 49
3.4 Approach 49
3.5 PHY Models in MATLAB 49
3.6 MATLAB 49
3.7 MATLAB Toolboxes 50
3.8 Sim
2019-12-21 22:05:41
6.99MB
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4G LTELTE-Advanced for Mobile Broadband (Second Edition)
Base on Release 11
Second edition 2014
Erik Dahlman
Stefan Parkvall
Johan Sko¨ld
2019-12-21 22:05:23
9.62MB
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