SCMA Settings (Custom OFDM)
The SCMA Settings are used to configure 5G demodulation over Custom OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS.. When the Multiple Access Scheme is set to SCMA, the SCMA Settings section of the Multiple Access tab describe the SCMA parameters.
| Parameter | Description |
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This value is the number of code words for each layer at each spreading value. The number of bits in a code word is log2(Code Word Size). This value must be a power of two, and is rounded up if necessary to get to a power of two. The default value is 4, the minimum is 2, and the maximum is 8. Default: 4 |
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Defines the comma-delimited SCMA codebook. This array holds the real and imaginary parts of the codebook. The length is calculated as: Number of Layers * Spreading Factor * Code Word Size * 2 (The 2 is because the array holds alternating real and imaginary values.) The order of elements in the array is:
Default: 1, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, -1 |
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Enables or disables each layer. This is an array of boolean values, one value for each layer in Number of Layers. This specifies which of the layers are enabled in the signal. Default: 1, 1 |
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Sets the number of layers. This is the number of layers in the Codebook. The default value is 2, the minimum is 1, and the maximum is 8. Default: 2 |
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Sets the spreading factor. This is the number of resource units over which each symbol is spread. The default value is 2, the minimum is 1, and the maximum is 6. Default: 2 |
See Also
