Description: The basic parts of the BFSK transmitter are the preamble and the data input circuit. The preamble sequence is positioned in front of each packet of 122 bits for a total of 128 bits packet. The main purpose of the preamble is to facilitate the reception, providing both bit and packet synchronization. The data input circuit mainly consists from memory elements and a convolutional encoder with r=1/2. Thus, the input bits must be stored in a temporary memory and be partitioned in blocks of 61 bits. Then the convolutional encoder doubles the bits and adds two more trail bits at the end of the message. A multiplexer makes sure that that the correct sequence, choosing between preamble and encoded bit, is propagating to the next stage. The next stage of the transmitter consists of two direct digital synthesizers (DDS), and a multiplexer that is fed with zeros and ones to choose between the two frequencies. For each bit, we allow 64 samples of the respective frequency to be transmitted. Although the implementation of the selection between the two frequencies is strait forward, the enable port of the multiplexer should be used along with a Matlab Code (MCode) block in order to prevent the propagation of some initial undefined states during initialization. The only functionality of the MCode block is to enable the multiplexer after the first bit of the preamble is detected. Finally, pulse shaping is not used and the addition of a single filter after the last multiplexer would suffice to implement this functionality. Platform: |
Size: 31381 |
Author:publicxz |
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Description: 用matlab进行直序扩频通信系统误码率的仿真分析PN码同步方法的比较与仿真-Using matlab for Direct Sequence Spread Spectrum Communication System Simulation and Analysis of bit error rate PN code synchronization methods and simulation Platform: |
Size: 12288 |
Author:吴胜军 |
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Description: 位同步源代码，是关于MATLAB的，很好的，并且具体有调制解调的功能！-Bit synchronization source code on MATLAB, very good, and the specific modulation and demodulation functions Platform: |
Size: 439296 |
Author:沉月恋 |
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Description: 本代码在OFDM系统中，用matlab实现8-PSK的调制、载波同步及其误码率计算-This code completes The modulation，carrier synchronization and the bit error rate test of 8-psk in an OFDM system . Platform: |
Size: 1024 |
Author:王远路 |
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Description: 利用MATLAB设计仿真5位巴克码“1 1 1 -1 1”代码的识别，并判断该五位巴克码能否实现同步-The use of MATLAB design and Simulation of 5 Barker code 111-1 1 identification code, and determine whether the five bit Barker code can achieve synchronization Platform: |
Size: 1024 |
Author:邓彬 |
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