| Communications Blockset™ | |
AM, in Digital Baseband sublibrary of Modulation
The General QAM Modulator Baseband block modulates using quadrature amplitude modulation. The output is a baseband representation of the modulated signal.
The Signal constellation parameter defines the constellation by listing its points in a length-M vector of complex numbers. The input signal values must be integers between 0 and M-1. The block maps an input integer m to the (m+1)st value in the Signal constellation vector.
The input can be either a scalar or a frame-based column vector. For integer inputs, the block can accept the data types int8, uint8, int16, uint16, int32, uint32, single, and double. For bit inputs, the block can accept int8, uint8, int16, uint16, int32, uint32, boolean, single, and double.
A real or complex vector that lists the constellation points.
The output data type can be set to double, single, Fixed-point, User-defined, or Inherit via back propagation.
Setting this to Fixed-point or User-defined will enable fields in which you can further specify details. Setting this to Inherit via back propagation, sets the output data type and scaling to match the following block..
Specify the word length, in bits, of the fixed-point output data type. This parameter is only visible when you select Fixed-point for the Output data type parameter.
Specify any signed built-in or signed fixed-point data type. You can specify fixed-point data types using the sfix, sint, sfrac, and fixdt functions from Simulink® Fixed Point™ software. This parameter is only visible when you select User-defined for the Output data type parameter.
Specify the scaling of the fixed-point output by either of the following two methods:
Choose Best precision to have the output scaling automatically set such that the output signal has the best possible precision.
Choose User-defined to specify the output scaling in the Output fraction length parameter.
This parameter is only visible when you select Fixed-point for the Output data type parameter, or when you select User-defined and the specified output data type is a fixed-point data type.
For fixed-point output data types, specify the number of fractional bits, or bits to the right of the binary point. This parameter is only visible when you select Fixed-point or User-defined for the Output data type parameter and User-defined for the Set output fraction length to parameter.
General QAM Demodulator Baseband
Rectangular QAM Modulator Baseband
| General QAM Demodulator Baseband | General TCM Decoder | |
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