身后人

Punctures data according to puncture vector

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Library:
Wireless HDL Toolbox / Error Detection and Correction

Description

The身后人block punctures input data based on a specified puncture vector. The block accepts puncture vector either from theInput port或者from thePropertyof the block and supports encoder rates from 1/2 to 1/7. It provides an architecture suitable for HDL code generation and hardware deployment.

块支持金宝appContinuousandFramemode operations and accepts both scalar and vector data. InContinuousmode, the block accepts input data and puncture vector, along with control signals valid and syncPunc and outputs punctured data with a valid signal. InFramemode, the block accepts input data and puncture vector, along with asamplecontrolbus and outputs punctured data with asamplecontrolbus.

块支持金宝appcommunication standards such as Wi-Fi (802.11a/b/g/n/ac), digital satellite communications, digital video broadcast (DVB), WiFi (IEEE 802.11a/b/g/n/ac), WiMax (IEEE 802.16), IEEE 802.16, HIPERLAN, and HiperMAN.

Ports

Input

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`data`— Input data sample
scalar | column vector of size from 2 to 7

Input data sample, specified as a scalar or vector.

如果输入为矢量类型，则输入数据的大小必须与所选的Encoder rateparameter value.

For example, if theEncoder rateis1/2, the input data size must be 2-by-1.

Data Types:Boolean|fixdt(0,1,0)

`valid`- 指示有效的输入数据样本
scalar

Control signal that indicates if the input data is valid. When this value is1(true), the block accepts the values on thedatainput port. When this value is0(false), the block ignores the values on thedatainput port.

Dependencies

To enable this port, set theOperation modeparameter toContinuous.

Data Types:Boolean

`旁观者`— Puncture vector
column vector of binary values

Puncture vector, specified as a column vector of binary values. The length of the puncture vector must be an integral multiple ofn, whereEncoder rateis1/n. For encoder rates 1/2, 1/3, 1/5, and 1/6, the maximum length of the旁观者is 30 and for encoder rates 1/4 and 1/7, the maximum length of the旁观者is 28.

You can change the旁观者pattern, but its length must remain constant. If the maximum puncture vector length provided is 10, the block supports all the vector lengths below 10.

Example:对于编码器速率1/2及其穿刺率2/3、3/4和5/6，相应的矢量长度为4、6和10Puncture vector sourceparameter toInput port. To support the largest vector size, the vector length must be 10 for all rates. For 2/3 and 3/4 rates, pad the旁观者输入0创建10-element向量。The puncture vector for rate 3/4 is[1 1 0 1 1 0]'. For a vector length of 10, use[0 0 0 0 1 1 0 1 1 0]'as the input旁观者.

When theOperation modeparameter is set toContinuous, the block captures the value of旁观者when bothSyncpuncand inputvalidport signals are1(true).

When theOperation modeparameter is set toFrame, the block captures the value of旁观者when bothctrl.startandctrl.validsignals are1(true).

Dependencies

To enable this port, set thePuncture vector sourceparameter toInput port.

Data Types:Boolean

`Syncpunc`— Puncture synchronization signal
scalar

Puncture synchronization signal, specified as aBooleanscalar value. This input is a control signal that synchronizes the puncture vector input with the input sample. When bothSyncpuncandvalidare1(true), the block aligns the puncture vector to begin puncturing. The block captures the vector from either the旁观者input port or from thePuncture vectorparameter.

The block ignores the旁观者signal values whenSyncpuncsignal value is0(false).

Dependencies

To enable this port, set theOperation modeparameter toContinuous.

Data Types:Boolean

`ctrl`— Control signals accompanying sample stream
`samplecontrol`bus

Control signals accompanying the sample stream, specified as asamplecontrolbus. The bus includes thestart,end, andvalidcontrol signals, which indicate the boundaries of the frame and the validity of the input samples.

start— Indicates start of input frame.
end— Indicates end of input frame.
valid— Indicates that the data on the inputdataport is valid.

Dependencies

To enable this port, set theOperation modeparameter toFrame. In this mode, the block synchronizes the puncture vector using control signals in the inputsamplecontrolbus.

Data Types:bus

Output

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`data`— Punctured output data
n-by-1 column vector

刺穿的输出数据，返回为N-1列向量，其中nvalue ranges from 1 to 7.

Data Types:Boolean|fixdt(0,1,0)

`valid`— Validity of output data samples
scalar

Control signal that indicates when the sample from thedataoutput port is valid. The block sets thevalidport to1(true) when there is a valid sample on the outputdataport.

Dependencies

To enable this port, set theOperation modeparameter toContinuous.

Data Types:Boolean

`ctrl`— Control signals accompanying sample stream
`samplecontrol`bus

Control signals accompanying the sample stream, returned as asamplecontrolbus. The bus includes thestart,end, andvalidcontrol signals, which indicate the boundaries of the frame and the validity of the samples.

start— Indicates start of output frame.
end— Indicates end of output frame.
valid— Indicates that the data on the outputdataport is valid.

Dependencies

To enable this port, set theOperation modeparameter toFrame.

Data Types:bus

Parameters

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`Operation mode`— Mode of operation
`Continuous`(default) |`Frame`

Mode of operation, specified as one of these modes:

Continuous— Allows changes to旁观者at any time. To force the block to capture the new puncture vector, set theSyncpuncparameter to1(true).
Frame— Allows changes to旁观者only at the start of a frame, indicated byctrl.start.

`Encoder rate`- 编码器的速率
`1/2`(default) | range from 1/2 to 1/7

选择刺穿数据的编码器速率。

`Puncture vector source`— Source of puncture vector
`Input port`(default) |`Property`

Source of puncture vector, specified as:

Input port— Specify the puncture vector using the旁观者port.
Property— Specify the puncture vector using thePuncture vectorparameter.

`Puncture vector`- 要刺穿的数据位置
`[1;1;1;0;0;1]`(default) | column vector of binary values

The length of the puncture vector must be an integral multiple ofn, whereEncoder rateis1/n. For encoder rates 1/2, 1/3, 1/5, and 1/6, the maximum length of the puncture vector is 30 and for encoder rates 1/4 and 1/7 the maximum length of the puncture vector is 28.

Dependencies

To enable this port, set thePuncture vector sourceparameter toProperty.

Model Examples

Convolutional Encode and Puncture Streaming Samples

Use the hardware-friendly Convolutional Encoder and Puncturer blocks to encode samples at WLAN code rates.

打开脚本

Algorithms

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The puncturing algorithm checks everynelements of a puncture vector, with anEncoder rate1/n, until it reaches a nonzero combination. Then, it punctures the input data and provides the punctured output data.

For example, if theEncoder rateis1/3and the puncture vector is[0; 0; 0; 1; 0; 1], the block checks every 3 elements until it reaches a nonzero combination in the puncture vector and then punctures the input data based on the type of inputs (scalar or vector) and operation modes (Continuous或者Frame).

标量输入

Continuousmode — When the puncture vector element is0, the block punctures the input data and provides no output. When the puncture vector element is1, the block provides the corresponding input data as output.
Framemode — When the puncture vector element is1, the block stores the corresponding input data in a buffer. It waits till it encounters the next1in the puncture vector and then provides the previous buffered data as output.
When the puncture vector element is0, the block punctures the input data and provides no output. But, if theendInsignal is1(high), the block provides the previous buffered data as output. The block repeats the similar process throughout the frame.

向量输入

Continuousmode — For a 3-by-1 vector input data withEncoder rate1/3, the block selects 3 elements of the puncture vector at a time. When the puncture vector element is0, the block punctures the data and provides no output. When the puncture vector element is1, the block stores the corresponding input data. The block provides the output only when the stored data count reaches 3.
Framemode — The block behaves similarly as when inContinuous模式。但是，当endInsignal is1(high) and the stored data count is less than 3, the block pads zeros and then outputs the data.

Latency

The latency of the block varies with the puncture vector and encoder rate. The above waveforms show the latency of the block for a sample scalar and vector input data with different puncture vectors.

Performance

这些资源和性能数据是靶向Xilinx的生成的HDL的综合结果^®Zynq^®-7000 ZC706 board. The block is usingBooleaninput samples, in continuous mode with default settings with puncture vector length 6. The design achieves a clock frequency of 559 MHz.

Resource	使用的数字
路	50
FFS	40

If you set thePuncture vector sourceparameter toProperty, the design uses fewer LUT and FFS resources with more frequency. The hardware resources and frequencies vary based on the encoder rate and the puncture vector size.

参考

[1]Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.IEEE Std 802.11™- 2016 Part 11.

[2] EN 300 421 V1.1.2Digital Video Broadcasting (DVB); Framing structure, Channel coding and modulation for 11/12 GHz satellite services.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

This block supports C/C++ code generation for Simulink^®加速器和快速加速器模式以及用于DPI组件的生成。

HDL Code Generation
Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

This block does not have any HDL Block Properties.

Version History

Introduced in R2019b

身后人

Description