Puncture - 2022.1 English

Vitis Model Composer User Guide (UG1483)

Document ID
Release Date
2022.1 English

The Xilinx Puncture block removes a set of user-specified bits from the input words of its data stream.

Based on the Puncture Code parameter, a binary vector that specifies which bits to remove, it converts input data of type UFixN_0 (where N is equal to the length of the puncture code) into output data of type UFixK_0 (where K is equal to the number of ones in the puncture code). The output rate is identical to the input rate.

This block is commonly used in conjunction with a convolution encoder to implement punctured convolution codes as shown in the figure below.

Figure 1. Implementing Punctured Convolution Codes

The system shown implements a rate Ā½ convolution encoder whose outputs are punctured to produce four output bits for each three input bits. The top puncture block removes the center bit for code 0 ( [1 0 1] ) and bottom puncture block removes the least significant bit for code 1 ( [1 1 0 ] ), producing a 2-bit punctured output. These data streams are serialized into 1-bit in-phase and quadrature data streams for baseband shaping.

Block Parameters

The block parameters dialog box can be invoked by double-clicking the icon in your SimulinkĀ® model.

Parameters specific to the block are as follows:

Puncture Code
The puncture pattern represented as a bit vector, where a zero in position i indicates bit i is to be removed.

Other parameters used by this block are explained in the topic Common Options in Block Parameter Dialog Boxes.