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-ay Pulse amplitude modulation)
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....
Some bandpass modulation schemes
-M-PAM, M-PSK, M-FSK, M-QAM
-How to perform coherent and non-coherent detection
-How to calculate the average probability of symbol error for different modulation schemes that we studied?
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
Another source of error due to filtering effect of the system:
-Inter-symbol interference (ISI)
-The techniques to reduce ISI
-Pulse shaping to have zero ISI at the sampling time
-Equalization to combat the filtering effect of the channel
In 2009 the world celebrated 50 years of lasers, bringing to the attention of the
public how deeply lasers and laser related technologies have revolutionized both
science and everyday life. Next year will be the fiftieth anniversary of the semiconductor
laser. Used as a compact light source with high modulation rates, it
transformed telecommunications in combination with glass fibers. Today laser
diodes are omnipresent in data storage and communication. Still, most of these
applications are based on infrared or red laser diodes.
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.
Chuyển nguồn thông tin (âm thanh) trong hệ thống số Cấu trúc bộ Format Lấy mẫu Lượng tử hóa Luật nén A và luật nén PCM
Formatting và truyền tín hiệu dải gốc
Digital info. Textual source info. Analog info. Format
Bit stream Pulse waveforms
Format cho tín hiệu analog
Để chuyển từ dạng sóng analog tương thích trong hệ thống số ta phải qua 2 bước sau 1....
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 Pulse Interval Modulation for Ultra-High Speed IR-UWB Communications Systems
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.
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 Combining OOK with PSM Modulation for Simple Transceiver of Orthogonal Pulse-Based TH-UWB Systems
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: Differential Amplitude Pulse-Position Modulation for Indoor Wireless Optical Communications
-ATPaseof skeletalmuscle sarcoplasmic reticulum
(SERCA), an integral membrane protein, becomes irre-versibly inactivatedin vitroby the addition of a single bolus
of peroxynitritewithaK0.5of 200–300lM, and this results in
a large decrease of theATP-dependentCa
the sarcoplasmic reticulum (SR) membranes. The inactiva-tion of SERCA is raised by treatment of SR vesicles with
repetitivemicromolar pulses of peroxynitrite.
Large bandwidth penalty since the subcarriers can’t have perfectly rectangular pulse shapes and still be time-limited. Very high quality (expensive) low pass filters will be required to maintain the orthogonality of the subcarriers at the receiver.
Chapter 11 provides knowledge of JPEG. This chapter presents the following content: What is JPEG? Basic JPEG compression pipeline, major coding algorithms in JPEG, quantisation, quantisation tables, differential pulse code modulation (DPCM) on DC component, run length encode (RLE) on AC components,...
Control methods for high-performance ASDs with induction motors by direct selection of consecutive states of the inverter are presented in this chapter. The direct torque control (DTC) and Direct Self-Control (DSC) techniques are explained, and we describe an enhanced version of the DTC scheme, employing the space-vector pulse width modulation in the steady state of the drive.
Hướng dẫn sử dụng Kit 89
Bài 14 : PWM điều khiển motor
Mục đích: Nắm vững kĩ thuật điều xung PWM. Yêu cầu: Viết ứng dụng điều khiển motor chạy ở nhiều tốc độ khác nhau.
14.1 Khái niệm PWM
PWM viết tắt của từ Pulse Width Modulation. PWM được sử dụng nhiều trong hệ thống điều khiển tự động ngày nay.
Laboratory Procedure I . PCM Familiarization A. The analog to digital conversion properties of the PCM was investigated in the last experiment.
The “start” bit and the 7 data bits and two “stop” bits were identified. It was also found that if the parity switch is on, then the 1st stop bit is changed to an even parity bit. That is, the 7 data bits plus the parity bit will always be an even number (refer to figure 8 B) B. Set up Figure 8A. the MSB-LSB quantization switches are to be implemented using the Sample and hold and Quantizer blocks....
The 555 timer is one of the most useful electronic devices in the
market. The 555 timer was first introduced by Signetics but today it is manufactured
by nearly all semiconductor firms. The cost of this device is low
and it is widely available. The 555 timer has lots of uses such as: Mark Space
Adjustment, Pulse Width Modulation and Inductive Current Detection just
to name a few. The 555 has some unique advantages and capabilities, such as: low-cost, high
operating voltage (5-15V) range, it is high powered and at the same time able to
be triggered by small currents.