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HDB3 encoder
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Based on FPGA as a hardware platform, QUARTUS II software platform based on EDA tools to achieve the HDB3 encoder/decoder. Because on the QUARTUS II EDA software platform cannot handle bipolar signals, and HDB3 encoder/decoder implementations include: software and hardware components. Piece is based on the QUARTUS II software platforms to enter code for encoding and decoding system, verify the correctness of HDB3 decoding; hardware using CD74HC4052 mode selector implementation of a dual-four unipolar and bipolar conversion AD790 and SE5539 to convert to bipolar-unipolar. Finally, through simulation, verify the correctness of the programme.
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Design of multifunctional bicycle odometer
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The design using AT89S52 microcontroller as the core, Hall sensors for measuring the speed, and the bike mileage, speed, time, temperature measurement and statistics, using memory 24C32 realize the power down time to save mileage and miles of bike and speeds with LCD display. Article detailing the bicycle speedometer hardware circuit and software design. Hardware by Hall element will bike number of pulses per turn around incoming MCU system and single-chip microcomputer system to send the signal processed LCD display. Software using the c programming language, and uses a modular design concept. The circuit is simple, the subroutine is universal, fully meet the design requirements.
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Daubechies Wavelet applications in PSK symbol rate
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With the development of technology in various fields, the electronic device is applied everyday life. Filled with all kinds of wireless signals of different frequencies, modulation of human existence in space. Have in different areas of the symbol rate different meanings, such as the rate of civilian communications in some wireless signals and modulation are predictable, but in the field of military operations, electronic warfare, etc. is not the case, a well-kept secret of the the modern military field is very important. In order to properly obtain useful information, the symbol rate is an important step in the measurement, if the known symbol rate, to help analyze the type of modulation symbols, and then acquires the communication information. Feature extraction using wavelet transform signal instantaneous mutation information to analyze the symbol rate is an extremely effective means. PSK modulation in the current field of communication
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The implementation of Hdb3 encoding based on FPGA
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HDB3 code is a bipolar NRZ based on the improvement of the AMI code, not only does it have no DC component in the power spectrum, like the AMI code, and can be self-test error, etc., but also overcomes the time extraction difficulty when there is continuous "0" appears in the AMI code, and the spectrum energy of the HDB3 code concentrated in the fundamental frequency range, occupaying a narrow band, is recommended by ITU-TG.703 for digital transmission interface code of PCM-based group, the second group and three groups, so the codec HDB3 code becomes extremely important. Currently, HDB3 code mainly implemented by ASIC and the corresponding peripheral matching small-scale integrated chip, but the degree of integration is low, especially the bit synchronization extraction is very complex and difficult to achieve. With the development of programmable devices, this problem has been well resolved. In this pa
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