comm_QPSKDemodulator()工具箱BitOut参数与DecisionMethod不匹配 - FAQ

问题现象

运行如下代码，报错ERROR: ArgumentError: When the DecisionMethod property is set to ‘Log-likelihood ratio’ or ‘Approximate log-likelihood ratio’, the bitOutput property must be ‘true’。

解决方法

报错原因是字符串大小写未兼容，将Log改成小写的log即可。

hMod = comm_QPSKModulator()

hMod.PhaseOffset = 0

hMod.BitInput = true

hMod.SymbolMapping = “Gray”

hDemodSoft = comm_QPSKDemodulator()

hDemodSoft.PhaseOffset = 0

hDemodSoft.BitOutput = true

hDemodSoft.SymbolMapping = “Gray”

hDemodSoft.DecisionMethod = “Approximate log-likelihood ratio”

hDemodSoft.VarianceSource = “Property” # Source of noise variance

hDemodSoft.Variance = 1 # will be refreshed in the simulation

Uw1Bit = [0; 0; 0; 0; 0; 0; 1; 1; 1; 1; 0; 0]

Uw1Mod = step(hMod, Uw1Bit)

Uw1Mod = Uw1Mod[:, 1]

llrSoft2 = step(hDemodSoft, Uw1Mod)

问题现象

解决方法

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