CPFSK MODULATION PDF

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Documentation Help Center. The output is a baseband representation of the modulated signal. See Construction. Call step to modulate the signal according to the properties of comm. The behavior of step is specific to each object in the toolbox. This object modulates the input signal using the continuous phase frequency shift keying CPFSK modulation method.

You can specify additional name-value pair arguments in any order as Name1 , Value1 , This object has the ModulationOrder property set to M , and the other specified properties set to the specified values.

Specify the size of the symbol alphabet. The value of this property requires a power of two, real, integer scalar. The default is 4. Specify whether the input is bits or integers. The default is false. When you set this property to false , the step method input must be a double-precision or signed integer data type column vector.

This vector comprises odd integer values between — ModulationOrder —1 and ModulationOrder —1. The input data must be double precision or logical data type.

The object maps each bit word to an integer K between 0 and ModulationOrder —1, using the mapping specified in the SymbolMapping property. The object then maps the integer K to the intermediate value 2 K — ModulationOrder —1 and proceeds as in the case when you set the BitInput property to false.

Specify the mapping of bit inputs as one of Binary Gray. The default is Binary. When you set this property to Binary , the object uses a natural binary-coded ordering. When you set this property to Gray , the object uses a Gray-coded ordering. This property applies when you set the BitInput property to true.

Specify the modulation index. The default is 0. The value of this property can be a scalar, h , or a column vector, [ h 0 , h 1 , …. When h i varies from interval to interval, the object operates in multi-h. When the object operates in multi-h, h i must be a rational number. Specify the initial phase of the modulated waveform in radians as a real, numeric scalar.

Specify the upsampling factor at the output as a real, positive, integer scalar. The default is 8. The upsampling factor is the number of output samples that the step method produces for each input sample. Specify output data type as one of double single. The default is double. The object properties correspond to the block parameters.

CPMDemodulator comm. A modified version of this example exists on your system. Do you want to open this version instead? Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select:.

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Toggle Main Navigation. Search Support Support MathWorks. Search MathWorks. Off-Canvas Navigation Menu Toggle. To modulate a signal using the continuous phase frequency shift keying method: Define and set up your CPFSK modulator object.

Properties ModulationOrder Size of symbol alphabet Specify the size of the symbol alphabet. BitInput Assume bit inputs Specify whether the input is bits or integers. ModulationIndex Modulation index Specify the modulation index. InitialPhaseOffset Initial phase offset Specify the initial phase of the modulated waveform in radians as a real, numeric scalar.

SamplesPerSymbol Number of samples per output symbol Specify the upsampling factor at the output as a real, positive, integer scalar. OutputDataType Data type of output Specify output data type as one of double single.

Open Live Script. See Also comm. No, overwrite the modified version Yes. Select a Web Site Choose a web site to get translated content where available and see local events and offers. Select web site. Size of symbol alphabet Specify the size of the symbol alphabet.

Assume bit inputs Specify whether the input is bits or integers. Symbol encoding Specify the mapping of bit inputs as one of Binary Gray.

Modulation index Specify the modulation index. Initial phase offset Specify the initial phase of the modulated waveform in radians as a real, numeric scalar. Number of samples per output symbol Specify the upsampling factor at the output as a real, positive, integer scalar. Data type of output Specify output data type as one of double single.

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Variable rate CPFSK modulation technique

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ERWIN ROHDE PSICHE PDF

Continuous phase modulation

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comm.CPFSKModulator

Continuous phase modulation CPM is a method for modulation of data commonly used in wireless modems. In contrast to other coherent digital phase modulation techniques where the carrier phase abruptly resets to zero at the start of every symbol e. For instance, with QPSK the carrier instantaneously jumps from a sine to a cosine i. This discontinuity requires a relatively large percentage of the power to occur outside of the intended band e. Furthermore, CPM is typically implemented as a constant-envelope waveform , i. Therefore, CPM is attractive because the phase continuity yields high spectral efficiency, and the constant envelope yields excellent power efficiency. The primary drawback is the high implementation complexity required for an optimal receiver.

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