Xem 1-20 trên 29 kết quả Pulse modulation
  • Transforming the information source to a form compatible with a digital system -Sampling -Aliasing -Quantization -Uniform and non-uniform -Baseband modulation -Binary pulse modulation -M-ary pulse modulation -M-PAM (M-ay Pulse amplitude modulation)

    pdf22p huemanvdoc 23-11-2009 71 16   Download

  • 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....

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  • 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?

    pdf25p huemanvdoc 23-11-2009 85 29   Download

  • Transforming the information source to a form compatible with a digital system. Sampling. Aliasing. Quantization Uniform and non-uniform. Baseband modulation. 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

    ppt22p doanhung_dtvtk10 24-03-2013 27 7   Download

  • 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

    pdf27p huemanvdoc 23-11-2009 60 6   Download

  • 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.

    pdf109p hotmoingay 03-01-2013 27 5   Download

  • Mã hóa kênh ( Channel coding ) Mã hóa khối (Block codes) + Mã lập (Repetition Code) + Hamming codes + Cyclic codes * Reed-Solomon codes Mã hóa chập (Convolutional codes) + Encode + Decode Sơ đồ khối hệ thống DCS Source encode Channel encode Pulse modulate Bandpass modulate Channel Format Digital modulation Digital demodulation Format Source decode Channel decode Detect Demod.

    pdf36p muaythai4 29-10-2011 307 124   Download

  • 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.

    pdf207p binhbut 22-08-2010 165 97   Download

  • 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 Sample Quantize Encode Pulse modulate Bit stream Pulse waveforms Transmit Channel Analog info. Demodulate/ Detect Receive Format cho tín hiệu analog Để chuyển từ dạng sóng analog tương thích trong hệ thống số ta phải qua 2 bước sau 1....

    pdf25p muaythai4 29-10-2011 64 10   Download

  • 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

    pdf8p dauphong14 11-02-2012 25 4   Download

  • Another source of error due to filtering effect of the system: Intersymbol. interference (ISI) The techniques to reduce ISI. Pulse shaping to achieve zero ISI at the sampling time. Equalization to combat the filtering effect of the channel.Some bandpass modulation schemes used in DCS for transmitting information oer channel. MPAM, MPSK, MFSK, MQAM How to detect the transmitted information at the receiver. Coherent detection. Noncoherent detection.

    ppt27p doanhung_dtvtk10 24-03-2013 29 4   Download

  • 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

    pdf11p sting08 20-02-2012 23 2   Download

  • 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

    pdf9p sting11 10-03-2012 13 2   Download

  • TheCa 2+ -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 2+ gradient across the sarcoplasmic reticulum (SR) membranes. The inactiva-tion of SERCA is raised by treatment of SR vesicles with repetitivemicromolar pulses of peroxynitrite.

    pdf11p dell39 03-04-2013 13 2   Download

  • 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.

    ppt27p nhq_khtn 07-11-2013 17 2   Download

  • 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,...

    pdf25p estupendo4 18-08-2016 2 1   Download

  • 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.

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  • 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.

    pdf2p hoatuongvihong 31-10-2011 156 85   Download

  • 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....

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  • 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.

    pdf48p hoangdt08 24-08-2010 138 57   Download

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