Version:

Last Modified: February 7, 2018

Calculates parameters for use with either MT Modulate PAM or MT Demodulate PAM. The node accepts an *M*-ary value that specifies a predefined symbol map with the number of distinct levels to use as symbols.

The *M*-ary number, which for PAM is the number of distinct states that represent symbols in the complex baseband modulated waveform. This value must be a positive power of 2.

The *M*-to-symbol-map mapping is performed using a gray-coding approach. In this approach, the binary interpretation of the index of any value in the symbol map array corresponds to the bit sequence associated with the symbol map location. For example, with 4-PAM (2 bits per symbol), a returned symbol map in the order [-1, -0.33, 1.00, 0.33] implies that the bits 00 are mapped to the symbol map location -1, the bits 01 are mapped to the symbol map location -0.33, the bits 10 are mapped to the symbol map location 1.00, and the bits 11 are mapped to the symbol map location 0.33.

**Default: **2

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an **error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

**Default: **No error

Parameter values defining the PAM system. Wire this cluster to the corresponding **system parameters** cluster of MT Modulate PAM or MT Demodulate PAM.

Number of samples per symbol in the modulated output complex waveform. For error-free operation, the **samples per symbol** must be an even number.

An ordered array that maps each symbol to its desired level. The number of PAM levels in the array is 2^{ N }, where *N* is the number of bits per symbol. The vector length for the symbols farthest from the origin is 1.

Number of bits represented by each symbol. This value is equal to Log_{ 2 }(*M*), where *M* is the order of the modulation (for example, for 16-PAM, *M* = 16).

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

**error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application