Past decade has seen a surge of research activities in the field of wireless communication. Emerging from this research thrust are new points of view on how to communicate effectively over wireless channels. The goal of this course is to study in a unified way the fundamentals as well as the new research developments. The concepts are illustrated using examples from several modern wireless systems (GSM, IS-95, CDMA 2000 1x EV-DO, Flarion's Flash OFDM, ArrayComm systems.)
So far we have only looked at specific communication
schemes. Information theory provides a fundamental limit to
(coded) performance. It succinctly identifies the impact of channel resources on
performance as well as suggests new and cool ways to
communicate over the wireless channel. It provides the basis for the modern development of
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....
Past decade has seen a surge of research activities in
the field of wireless communication. Emerging from this research thrust are new points of
view on how to communicate effectively over wireless
channels. The goal of this course is to study in a unified way the
fundamentals as well as the new research
Wireless communications is one of the most active areas of research over the
past and the current decades. In fact, the demand for wireless services has been
changing from the regular voice telephony services to mixed voice, data, and
multimedia services over the wireless media. Since the mid-1990s, the wireless
industry has been advancing at an incredible speed. For example, the 2G cellular
systems (such as GSM, D-AMPS, and IS-95) have significantly improved
the spectral efficiency and network capacity to support wireless telephony
Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: An occupancy-based and channel-aware multilevel adaptive scheme for video communications over wireless channels
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Opportunistic Multicasting Scheduling Using Erasure-Correction Coding over Wireless Channels
Quang Le-Dang and Tho Le-Ngoc
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Application of the Evidence Procedure to the Estimation of Wireless Channels
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Generalized Algorithm for the Generation of Correlated Rayleigh Fading Envelopes in Wireless Channels
Radio based communication, open air
The attacker, having a radio transmitter and receiver with the same radio frequency of the underlying wireless network, can easily:
Intercept wireless data
Connect his computing devices to a nearby wireless network
Inject new packets to an existing wireless network
Jam a particular wireless channel using a jamming device
Implement encryption algorithms, authentication algorithms, and integrity-check algorithms at the data-link layer
Provide network access with wired equivalent privacy
Higher-layer protocols and applications can be used ...
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Integrated Source and Channel Rate Allocation Scheme for Robust Video Coding and Transmission over Wireless Channels
Electronic and wireless technologies have changed the way we do businessforever. We have seen fast paced change in the last decade not only in information technology advancement but also in business model design and strategic
direction. Technology has become central to company operations as well as strategy.
Đến đây bạn đã cấu hình xong phần căn bản, bây giờ chúng ta chuyển sang bảo mật cho Wireless Router để ngăn ngừa các truy cập trái phép. Trên giao diện web đang mở, bạn vào Menu Wireless và chọn tab Basic Wireless Settings. Trong phần Network Mode bạn chọn chế độ Mixed để Wireless Router có thể phát sóng ở tất các chuẩn nó được hỗ trợ. Tiếp theo đến mục Network Name, đây chính là tên SSID của Wireless Router, bạn nên đặt một tên gợi nhớ.
A wireless local area network (WLAN) is exactly like a regular local area network (LAN), except that each
computer in the WLAN uses a wireless device to connect to the network. Computers in a WLAN share the same
frequency channel and SSID, which is an identification name shared by the wireless devices belonging to the
same wireless network.
page 3 Review of Stochastic Processes and Random Variables. Review of Discrete-Time Signal Processing. Components of a Digital Communication System. OFDM WLAN Overview. Single Carrier Versus OFDM Comparison. Chap 2 - Synchronization. page 51 Timing Estimation. Frequency Synchronization. Channel Estimation. Clear Channel Assessment. Signal Quality. Chap 3 - Modulation and Coding
Techniques for Effective Wireless Snifﬁng Understanding Wireless Card Operating Modes Conﬁguring Linux for Wireless Snifﬁng Conﬁguring Windows for Wireless Snifﬁng Using Wireless Protocol Dissectors Useful Wireless Display
Enable many mobile users to share simultaneously radio spectrum. Provide for the sharing of channel capacity between a number of transmitters at different locations. Aim to share a channel between two or more signals in such way that each signal can be received without interference from another.
So far we have only considered single-input multi-output
(SIMO) and multi-input single-output (MISO) channels. They provide diversity and power gains but no degree-offreedom
(d.o.f.) gain. D.o.f gain is most useful in the high SNR regime. MIMO channels have a potential to provide d.o.f gain. We would like to understand how the d.o.f gain depends
on the physical environment and come up with statistical
models that capture the properties succinctly.