EngeeComms.RaisedCosineReceiveFilter
Shapes the pulse by decimating the signal using a FIR filter with raised cosine.
| Library |
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| Block |
Description
To generate a pulse by decimating the signal using a FIR filter with raised cosine, follow the steps below:
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Create an object EngeeComms.RaisedCosineReceiveFilter and set its properties.
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Call the object with arguments as if it were a function.
To learn more about how to work with system objects, see Engee system objects.
Syntax
Creation
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rxfilter = EngeeComms.RaisedCosineReceiveFilter()- Returns a system object of a Raised Cosine FIR receive FIR filter that decimates the input signal using a Raised Cosine FIR filter. The filter utilises the effective polyphase decimation structure of the FIR filter and has unit energy.Example:
rxfilter = EngeeComms.RaisedCosineReceiveFilter() -
rxfilter = EngeeComms.RaisedCosineReceiveFilter(Name=Value)- creates a system object EngeeComms.RaisedCosineReceiveFilter with the specified propertyNameset to the specified valueValue. You can specify additional arguments as a name-value pair in any order (Name1=Value1,…,NameN=ValueN). For example,comm.RaisedCosineReceiveFilter(RolloffFactor=0.3)configures the Raised Cosine Receive Filter system object with the smoothing factor set to0.3.Example:
rxfilter = EngeeComms.RaisedCosineReceiveFilter(RolloffFactor=0.3)
Arguments
Input arguments
X -
input signal
vector-column | matrix
Details
An input signal specified as a column vector or matrix to , where i is the number of input samples per signal channel and is the number of signal channels.
For an input signal in the form of a matrix i by , the object treats the columns of the input matrix as independent channels.
This system object accepts variable-sized input data. After locking the system object, you can change the size of each input channel, but you cannot change the number of channels.
| Типы данных |
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| Support for complex numbers |
Yes |
Output arguments
Y -
output signal
vector-column | matrix
Details
The output signal returned as a column vector or matrix to . is equal to / DecimationFactor, where is the number of input samples per signal channel and is the number of signal channels.
The system object filters each channel in time and generates a matrix to at the output. The output signal has the same data type as the input signal.
Properties
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InputSamplesSymbol —
input counts per character
Real number
Details
Input counts per character, specified as a positive integer.
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DecimationOffset —
decimation bias
Real number
Details
The decimation offset, specified as an integer in the range [0, (DecimationFactor - 1)]. This property defines the number of filtered samples that the object discards before downsampling.
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RolloffFactor —
smoothing factor
Real number
Details
A smoothing factor specified as a scalar in the range [0, 1].
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DecimationFactor —
decimation factor
Real number
Details
The decimation factor specified as an integer in the range [1, InputSamplesPerSymbol]. This value must be evenly divisible by InputSamplesPerSymbol. The sampling rate of the output signal is reduced by the decimation factor so that length(Y)/length(X) is equal to DecimationFactor. For a matrix input signal, the number of input rows must be a multiple of the decimation factor.
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LinearAmplitudeFilterGain —
linear filter gain
Real number
Details
The linear filter gain factor of a filter, specified as a positive scalar. The system object designs the raised cosine of the filter having unit energy, and then applies the linear filter gain to obtain the final tap ratio values.
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FilterSpanSymbols —
filter range in characters
Real number
Details
The range of the filter in symbols, specified as a positive integer. The system object truncates the infinite impulse response (IIR) of an ideal raised cosine filter to an impulse response that spans the number of symbols specified by this property.