-
VHDL編寫的4選一數(shù)據(jù)選擇器
entity mux41a is
port(a,b:in
std_logic;
s1,s2,s3,s4:in std_logic;
y:
out std_logic);
end entity mux41a;
architecture one of mux41a is
signal ab:std_logic_vector(1 downto 0);
標簽：
VHDL
數(shù)據(jù)選擇器
上傳時間：
2020-05-15
上傳用戶：cdga
-
Duringthe past years, there has been a quickly rising interest in radio access technologies for providing
mobile as well as nomadic and fixed services for voice, video, and data. This proves that the difference
in design, implementation, and use between telecom and datacom technologies is also becoming more
blurred. What used to be a mobile phone used for voice communication is today increasingly
becoming the main data communication device for end-users, providing web browsing, social
networking, and many other services.
標簽：
LTELTE-Advanced
4G
上傳時間：
2020-05-26
上傳用戶：shancjb
-
Firstly, this book is set at a level suitable for senior undergraduate and
postgraduate students who wish to understand the fundamentals and applications
of adaptive array antenna systems. Array fundamentals are described in the text,
and examples which demonstrate theoretical concepts are included throughout
the book, as well as summaries and questions at the end of each chapter.
標簽：
Applications
Fundamentals
Adaptive
Systems
Array
and
上傳時間：
2020-05-26
上傳用戶：shancjb
-
This book gives a comprehensive overview of the technologies for the advances of
mobile radio access networks. The topics covered include linear transmitters,
superconducting filters and cryogenic radio frequency (RF) front head, radio over
fiber, software radio base stations, mobile terminal positioning, high speed
downlink packet access (HSDPA), multiple antenna systems such as smart
antennas and multiple input and multiple output (MIMO) systems, orthogonal
frequency division multiplexing (OFDM) systems, IP-based radio access networks
(RAN), autonomic networks, and ubiquitous networks.
標簽：
Advances
Networks
Access
Mobile
Radio
in
上傳時間：
2020-05-26
上傳用戶：shancjb
-
The very title of this book is borrowed from the information theory vocabulary,
and, quite naturally, it is an outline of this theory that will serve as an introduction.
The subject of information theory is the scientific study of communications. To this
end it defines a quantitative measurement of the communicated content, i.e. informa-
tion, and deals with two operations essential for communication techniques: source
coding and channel encoding.
標簽：
Communication
Networks
Channel
Coding
in
上傳時間：
2020-05-26
上傳用戶：shancjb
-
Wireless technology has been evolving at a breakneck speed. The total number of
cell-phones in use (as of 2011) was over 6 billion for a 7 billion world population [1]
constituting 87% of the world population. Additionally, with user convenience be-
coming paramount, more and more functions are being implemented wirelessly.
標簽：
Front-Ends
Cognitive
Receiver
Radio
上傳時間：
2020-05-26
上傳用戶：shancjb
-
The book you’re holding, physically or electronically, is the result of a very
interesting, challenging but also rewarding research project. The research was
carried out in different contexts and cooperations but it was centered around the
following question: how can we make the RF transmitters of our modern com-
munication systems (WiFi, GSM, LTE, and so on) more flexible and more efficient
at the same time.
標簽：
Continuous-Time
Front-Ends
Digital
上傳時間：
2020-05-27
上傳用戶：shancjb
-
The General Packet Radio Service (GPRS) allows an end user to send and
receive data in packet transfer mode within a public land mobile network
(PLMN) without using a permanent connection between the mobile station
(MS) and the external network during data transfer. This way, GPRS opti-
mizes the use of network and radio resources (RRs) since, unlike circuit-
switched mode, no connection between the MS and the external network is
established when there is no data flow in progress. Thus, this RR optimiza-
tion makes it possible for the operator to offer more attractive fees.
標簽：
Mobile
EDGE
上傳時間：
2020-05-27
上傳用戶：shancjb
-
The first Third Generation Partnership Project (3GPP) Wideband Code Division
Multiple Access (WCDMA) networks were launched during 2002. By the end of 2005
there were 100 open WCDMA networks and a total of over 150 operators having
frequency licenses for WCDMA operation. Currently, the WCDMA networks are
deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz
in Europe and Asia including Japan and Korea. WCDMA in America is deployed in the
existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is
expected to be available in the near future. 3GPP has defined the WCDMA operation
also for several additional bands, which are expected to be taken into use during the
coming years.
標簽：
HSDPAHSUPA
Access
Speed
Radio
UMTS
High
for
上傳時間：
2020-05-27
上傳用戶：shancjb
-
This book addresses two aspects of network operation quality; namely, resource
management and fault management.
Network operation quality is among the functions to be fulfilled in order to offer
quality of service, QoS, to the end user. It is characterized by four parameters:
– packet loss;
– delay;
– jitter, or the variation of delay over time;
– availability.
Resource management employs mechanisms that enable the first three parameters
to be guaranteed or optimized. Fault management aims to ensure continuity of service.
標簽：
Ethernet
Networks
MPLS
and
IP
上傳時間：
2020-05-27
上傳用戶：shancjb
