Punctured Convolutional Encoding This model shows how to use the Convolutional Encoder and Viterbi Decoder blocks to simulate a punctured coding system. The complexity of a Viterbi decoder increases rapidly with the code rate. Puncturing is a technique that allows the encoding and decoding of higher rate codes using standard rate 1/2 encoders and decoders. The example is somewhat similar to the one that appears in, which shows convolutional coding without puncturing. Structure of the Example This example contains these blocks from the Communications System Toolbox™.

Generating Random Data The Bernoulli Binary Generator block produces the information source for this simulation. The block generates a frame of three random bits at each sample time. The Samples per frame parameter determines the number of rows of the output frame.

Convolutional Encoding with Puncturing The Convolutional Encoder block encodes the data from the Bernoulli Binary Generator. This example uses the same code as described in.

Programs written in C/C++ and Matlab that implement encoding and decoding routines of popular error correcting codes. Collected by Robert Morelos-Zaragoza.

The puncture pattern is specified by the Puncture vector parameter in the mask. The puncture vector is a binary column vector. A 1 indicates that the bit in the corresponding position of the input vector is sent to the output vector, while a 0 indicates that the bit is removed. For example, to create a rate 3/4 code from the rate 1/2, constraint length 7 convolutional code, the optimal puncture vector is [1 1 0 1 1 0].' After the vector indicates the transpose). Bits in positions 1, 2, 4, and 5 are transmitted, while bits in positions 3 and 6 are removed.

Now, for every 3 bits of input, the punctured code generates 4 bits of output (as opposed to the 6 bits produced before puncturing). This makes the rate 3/4.

In this example, the output from the Bernoulli Binary Generator is a column vector of length 3. Because the rate 1/2 Convolutional Encoder doubles the length of each vector, the length of the puncture vector must divide 6. Jai Shri Krishna Flute Song Download there. Transmitting Data The AWGN Channel block simulates transmission over a noisy channel. The parameters for the block are set in the mask as follows. • The Mode parameter for this block is set to Signal to noise ratio (Es/No).

Adobe Photoshop Cs3 Portable Free Download Full Version For Windows Xp. Sefyu Molotov 4 Download Mp3. • The Es/No parameter is set to 2 dB. This value typically is changed from one simulation run to the next.

• The preceding modulation block generates unit power signals so the Input signal power is set to 1 Watt. • The Symbol period is set to 0.75 seconds because the code has rate 3/4.