An array of symbol values with an order that corresponds to the symbol map. The number of QAM states in the array must be 2 N , where N is the number of bits per symbol. The length or magnitude of the vector for the symbols farthest from the origin must be 1.
This node expects a two-dimensional, square array of integers for the symbol values parameter. 4-QAM expects a 2×2 array (2 rows, 2 columns), 16-QAM expects a 4×4 array, and so on. The integers 0 through (M-1) must all be included only once in the symbol values array, where M is the M-ary number of the modulation. M must be less than 256. The binary representation (LSB first convention) of the integers represents the bit pattern that is mapped to the corresponding symbol location in the symbol values array.
For example, for 4-QAM, if you specify symbol values as
the generated QAM symbol map is [(-0.707 - 0.707i), (0.707 + 0.707i), (0.707 - 0.707i), (-0.707 + 0.707i)].
In order to create a custom QAM symbol map that does not fit into a square 2 dimensional array, for example 32-QAM, set the additional spaces in the array to negative numbers. The negative number will not be considered as a part of the symbol map.