The Mobile Radio Propagation Channel
2020-04-06 03:06:01
4MB
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This course is to introduce Radio Network Evolution and principle. After this course, you can know radio network Evolution, understand GSM/WCDMA/LTE Radio Network System, network structure and key Technology.
2020-03-13 03:05:20
4.59MB
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Opportunistic unlicensed access to the (tem-
porarily) unused frequency bands across the
licensed radio spectrum is currently being inves-
tigated as a means to increase the efficiency of
spectrum usage. Such opportunistic access calls
for implementation of safeguards so that ongo-
ing licensed operations are not compromised.
Among different candidates, sensing-based
access, where the unlicensed users transmit if
they sense the licensed band to be free, is partic-
ularly appealing due to its low deployment cost
and its compatibility with the legacy licensed sys-
tems. The ability to reliably and autonomously
identify unused frequency bands is envisaged as
one of the main functionalities of cognitive
radios. In this article we provide an overview of
the regulatory requirements and major chal-
lenges associated with the practical implementa-
tion of spectrum sensing functionality in
cognitive radio systems. Furthermore, we outline
different design trade-offs that have to be made
in order to enhance various aspects of the sys-
tem’s performance.
2020-03-09 03:03:19
176KB
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作者：Professor Kwang-Cheng Chen，Professor Ramjee Prasad
出版：Wiley 2009
目录
Preface xi
1 Wireless Communications 1
1.1 Wireless Communications Systems 1
1.2 Orthogonal Frequency Division Multiplexing (OFDM) 3
1.2.1 OFDM Concepts 4
1.2.2 Mathematical Model of OFDM System 5
1.2.3 OFDM Design Issues 9
1.2.4 OFDMA 21
1.3 MIMO 24
1.3.1 Space-Time Codes 24
1.3.2 Spatial Multiplexing Using Adaptive Multiple Antenna Techniques 27
1.3.3 Open-loop MIMO Solutions 27
1.3.4 Closed-loop MIMO Solutions 29
1.3.5 MIMO Receiver Structure 31
1.4 Multi-user Detection (MUD) 34
1.4.1 Multi-user (CDMA) Receiver 34
1.4.2 Suboptimum DS/CDMA Receivers 37
References 40
2 Software Defined Radio 41
2.1 Software Defined Radio Architecture 41
2.2 Digital Signal Processor and SDR Baseband Architecture 43
2.3 Reconfigurable Wireless Communication Systems 46
2.3.1 Unified Communication Algorithm 46
2.3.2 Reconfigurable OFDM Implementation 47
2.3.3 Reconfigurable OFDM and CDMA 47
2.4 Digital Radio Processing 48
2.4.1 Conventional RF 48
2.4.2 Digital Radio Processing (DRP) Based System Architecture 52
References 58
3 Wireless Networks 59
3.1 Multiple Access Communications and ALOHA 60
3.1.1 ALOHA Systems and Slotted Multiple Access 61
3.1.2 Slotted ALOHA 61
3.1.3 Stabilised Slotted ALOHA 64
3.1.4 Approximate Delay Analysis 65
3.1.5 Unslotted ALOHA 66
3.2 Splitting Algorithms 66
3.2.1 Tree Algorithms 67
3.2.2 FCFS Splitting Algorithm 68
3.2.3 Analysis of FCFS Splitting Algorithm 69
3.3 Carrier Sensing 71
3.3.1 CSMA Slotted ALOHA 71
3.3.2 Slotted CSMA 76
3.3.3 Carrier Sense Multiple Access with Collision Detection (CSMA/CD) 79
3.4 Routing 82
3.4.1 Flooding and Broadcasting 83
3.4.2 Shortest Path Routing 83
3.4.3 Optimal Routing 83
3.4.4 Hot Potato (Reflection) Routing 84
3.4.5 Cut-through Routing 84
3.4.6 Interconnected Network Routing 84
3.4.7 Shortest Path Routing Algorithms 84
3.5 Flow Control 89
3.5.1 Window Flow Control 89
3.5.2 Rate Control Schemes 91
3.5.3 Queuing Analysis of the Leaky Bucket Scheme 9
2020-03-07 03:06:56
7.73MB
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The Design of CMOS Radio-Frequency Integrated Circuits 2ed
Author THOMAS H.LEE
2020-01-30 03:03:00
13.01MB
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射电，天文，综合孔径成像，数字接收机，相干观测，从事天文射电领域的教材
2020-01-03 11:34:02
19.06MB
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