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: This program includes:
[5 7] convolutional code (encoder) + BPSK + AWGN + MAP (decoder). It evaluates Bit Error Rate and plots it versus SNR(signal to Noise Ratio).
-This program includes:
[5 7] convolutional code (encoder)+ BPSK+ AWGN+ MAP (decoder). It evaluates Bit Error Rate and plots it versus SNR(signal to Noise Ratio).
Platform: |
Size: 1024 |
Author:阳关 |
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Description: GSM TCH/FS 信道编码仿真
仿真通信系统包括内外编码器、交织重排器、加性/突发或混合干扰信道、去交织反重排器、内外译码器，模拟了信息从信源到信宿的全过程；
在高斯噪声、突发干扰或混合信道下测试每个步骤对误码率和系统性能的影响，通过数字及图形的比较，得出通信系统中各个模块的作用。-GSM TCH/FS channel coding simulation Simulation of communication systems, including internal and external encoder, interleaving rearrangement, and additive/sudden or mixed channel interference, de-interlacing anti-rearrangement, and internal and external decoder, analog information from the source to the letter places the entire process in Gaussian noise, sudden disruption or mixed channel to test each step of the bit error rate and system performance, through the figures and graphics comparison, the communication system in the role of each module. Platform: |
Size: 45056 |
Author:123456 |
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Description: 卷积码（2，1，3）编码过程。代码清晰简单，对应人民邮电版《通信原理》中卷积码编码过程-Convolutional code (2,1,3) encoder. Code is clear and straightforward, Telecommunications for the corresponding version of " Communication Principle" in the process of convolutional coding Platform: |
Size: 118784 |
Author:zhaodanlin |
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Description: 交织编码器的verilog代码实现，此外有testbench和波形。-the verilog code for the interleave encoder, with the testbench code and waveform screen print. Platform: |
Size: 64512 |
Author:Yang Jie |
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Description: generates the output sequence of a binary convolutional encoder
G : N x LK Generator matrix of a convolutional code K : Number of input bits entering the encoder at each clock cycle.
input: Binary input sequence
state: State of the convolutional encoder
termmode= trunc for no termination with all-0 state
Copyleft: Won Y. Yang, wyyang53@hanmail.net, CAU for academic use only
X = Known frequency-domain training symbol
y = Time-domain output of the channel
H_est = Estimate of the channel response- generates the output sequence of a binary convolutional encoder
G : N x LK Generator matrix of a convolutional code K : Number of input bits entering the encoder at each clock cycle.
input: Binary input sequence
state: State of the convolutional encoder
termmode= trunc for no termination with all-0 state
Copyleft: Won Y. Yang, wyyang53@hanmail.net, CAU for academic use only
X = Known frequency-domain training symbol
y = Time-domain output of the channel
H_est = Estimate of the channel response Platform: |
Size: 4096 |
Author:inbustrious |
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Description: matlab programs for rate N convolutional encoder. These codes are very useful for making software defined radio in the lab. Platform: |
Size: 482304 |
Author:hari |
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Description: 卷积码是数字通信中很重要的一种差错控制编码 具有很好的性能,用硬件的形式描述具有速度快，便于修改的优点，通过该种方法设，计的编码器经测试运行可靠正确。-Convolutional codes are very important in digital communication error control coding with a good performance, with the description of the hardware in the form of a fast, easy to modify the benefits set by the methods, namely, the encoder has been tested and reliable operation correctly . Platform: |
Size: 4096 |
Author:will li |
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Search - convolutional encoder