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[Post-TeleCom sofeware systems] BPSK Transmitter DL : 0: 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.
Date : 2011-03-18 Size : 30.65kb User : publicxz
[Post-TeleCom sofeware systems] enc DL : 0: 自编常用无线通信编码器程序，C版本，函数封装-Commonly used self encoder wireless communications procedures, C version, function package
Date : 2026-01-01 Size : 5kb User : xieling
[Post-TeleCom sofeware systems] bch DL : 2: 主要仿真了二进制的BCH码采用BM算法的编码以及解码的过程-An encoder/decoder for binary BCH codes Error correction using the BERLEKAMP-MASSEY ALGORITHM
Date : 2026-01-01 Size : 5kb User : 雪林
[Post-TeleCom sofeware systems] parallel-turbo-coding DL : 0: turbo 码的并行编译码有编码器，译码器，交织器，调制器，解调器等函数-The turbo code is a parallel codec function of the encoder, decoder, and an interleaver, a modulator, a demodulator, etc.
Date : 2026-01-01 Size : 8kb User : 刘
[Post-TeleCom sofeware systems] gflib DL : 0: Reed-solomon编译码器库。具有良好的实用价值。-Reed-Solomon Encoder and Decoder C program library
Date : 2026-01-01 Size : 30kb User : antony
[Post-TeleCom sofeware systems] conv_encoder DL : 0: (2,1,7)卷积码编码器能设置初始状态和生成多项式的系数-(2,1,7) convolutional code encoder can set the initial state and the generator polynomial coefficients
Date : 2026-01-01 Size : 489kb User : wangjinchao
[Post-TeleCom sofeware systems] convolution DL : 0: code for convolution encoder test in telecommunication
Date : 2026-01-01 Size : 17kb User : sameer