This course is about a communication system which is used to transfer information from a source to a destination. Examples of communication systems are telephones, wireless data access, television and many others.How to transmit the information from a source to a destination.
How to evaluate the quality of the received information.
What kinds of design goals to consider for a specific application.
How to trade-off between various parameters (such as bandwidth and power) due to the design limitations and goals.
Reference subjects of digital information in English and fully understandable. This book was written to be a textbook for seniors or first - year graduate students interested in electrical communication systems. The book departs from the usual formata in two major respects. First, the text does not cover analog or pulse modulation systems.
This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques....
Wireless communications is, by any measure, the fastest growing segment of the communications industry. As
such, it has captured the attention of the media and the imagination of the public. Cellular systems have experienced
exponential growth over the last decade and there are currently around two billion users worldwide. Indeed,
cellular phones have become a critical business tool and part of everyday life in most developed countries, and
are rapidly supplanting antiquated wireline systems in many developing countries....
THE recent development of various methods of modulation such as PCM and PPM which exchange
bandwidth for signal-to-noise ratio has intensified the interest in a general theory of communication. A
basis for such a theory is contained in the important papers of Nyquist1 and Hartley2 on this subject. In the
present paper we will extend the theory to include a number of new factors, in particular the effect of noise
in the channel, and the savings possible due to the statistical structure of the original message and due to the
nature of the final destination of the information....
This is an undergraduate course in digital communications, which is designed to prepare students for engineering work in high-tech industries and for graduate work in communications, signal processing, and computer systems. The course covers basic concepts and useful tools for design and performance analysis of transmitters and receivers in the physical layer of a communication system. Prerequisite: An introductory course in probability. A course in signals and systems. Texts: J.G. Proakis, M. Salehi, Communication Systems Engineering M. P. Fitz, A Course in Communication Theory Graders:...
Scope of the course
-Digital Communication systems
- Communication is a process by which information is exchanged between individuals through a common system of symbols, signs, or behavior
This best-selling, easy to read book offers the most complete discussion on the theories and principles behind today's most advanced communications systems. Throughout, Haykin emphasizes the statistical underpinnings of communication theory in a complete and detailed manner. Readers are guided though topics ranging from pulse modulation and passband digital transmission to random processes and error-control coding. The fifth edition has also been revised to include an extensive treatment of digital communications....
Wireless communications is rapidly becoming one of the ubiquitous technological
underpinnings of modern society (such as electric power, fossil fuels, automobiles,
etc.). Few people think about the technology within their mobile phones, remote controls,
garage door openers, GPS navigation devices, and so on. They are always at hand and
reliably work for the user.
Yet even within the electrical engineering (EE) community, radio communication
techniques have a reputation as a “Black Art” that can only be successfully practiced
by “RF people”. This is changing, albeit slowly.
The two fundamental building blocks of a digital communication system are modulation and channel coding. They enable reliable communication by providing signaling schemes and receiver structures that utilize the available spectrum and power efficiently.
Transforming the information source to a form
compatible with a digital system.
Uniform and non-uniform.
Binary pulse modulation.
M-ary pulse modulation.
M-PAM (M-ary Pulse amplitude modulation).Assuming real time transmission and equal energy per
transmission data bit for binary-PAM and 4-ary PAM
[ Team LiB ] 4.2 Ports Ports provide the interface by which a module can communicate with its environment. For example, the input/output pins of an IC chip are its ports. The environment can interact with the module only through its ports.
Communications is a process by which information is
exchanged between individuals through a common system
of symbols, signs, or behaviour
“It is about communication between people; the rest is
Communication systems are reliable, economical and
efficient means of communications
Public switched telephone network (PSTN), mobile telephone
communication (GSM, 3G, 4G...), broadcast radio or television,
navigation systems, ...
The course is aiming at introducing fundamental issues
required for understanding and designing a (digital)
Important features of digital communication
Some basic concepts and definitions such as
as signal classification, spectral density,
random process, linear systems and signal
bandwidth.The first important step in any DCS:
Transforming the information source to a form
compatible with a digital syst
The Verilog HDL supports a hierarchical hardware description
structure by allowing modules to be embedded within other
modules. Higher level modules create instances of lower level
modules and communicate with them through input, output,
and bidirectional ports. These module input/output (I/O) ports
can be scalar or vector.
Cnet I/F System is used for communication between the main unit and external devices using RS-232C/RS-422 Interface.
The K80S has a built-in RS-232C port and has also G7L-CUEB for RS-232C, G7L-CUEC for RS-422. It is possible to
construct communications systems on demand. (10 points modules include RS-232C and RS-485 ports on the main module,
and no external communication module is available)
SugarCRM là một giải pháp dựa trên web của CRM được viết bằng PHP. SugarCRM có sẵn trong các flavour được gọi là Editions ("Community" – miễn phí, "Professional", và "Enterprise"). Để có cái nhìn tổng quan chi tiết về các editions khác, bạn có thể truy cập website của SugarCRM. Trong bài hướng dẫn sau đây chúng tôi trình bày cách cài đặt bản Community Edition miễn phí trên hệ thống Debian Squeeze hoặc Ubuntu 11.04 đã có nginx thay vì Apache.
Another source of error due to filtering
effect of the system:
The techniques to reduce ISI.
Pulse shaping to achieve zero ISI at the
Equalization to combat the filtering effect of
the channel.Some bandpass modulation schemes
used in DCS for transmitting information
How to detect the transmitted information
at the receiver.