MT Generate PAM System Parameters (M)

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.

1378

Inputs/Outputs

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samples per symbol

An even number of samples dedicated to each symbol. Multiply this value by the symbol rate to determine the sample rate.

Note The demodulation and detector nodes use timing recovery, which is optimized for four or more samples per symbol.

Default value: 16

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M-PAM

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.

Note 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 value: 2

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error in

Error conditions that occur before this node runs.

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

Standard Error Behavior

Default value: No error

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PAM system parameters

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

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samples per symbol

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

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symbol map

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

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bits per symbol

Number of bits represented by each symbol. This value is equal to Log2(M), where M is the order of the modulation (for example, for 16-PAM, M = 16).

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior