sample_delay_qpsk()
This function calculates the optimal sampling point within a symbol for a given QPSK waveform."Optimal" is defined as the sampling point that provides the lowest bit error rate
Syntax
y = sample_delay_qpsk(vlQ, symbolRate, path_delay, timeResolution)
Arguments
| Name | Description | Range | Type | Required |
|---|---|---|---|---|
| vlQ | complex envelope (I + j Q) of a QPSK signal | (-∞, ∞) | complex | yes |
| symbolRate | symbol rate of the QPSK signal | (0, ∞) | real | yes |
| path_delay | time delay on the waveform before the sampling starts † | (0, ∞) | real | yes |
| timeResolution | time step (typically one-tenth of a symbol time or less) used to search for the best sampling point in a given symbol period | (0, ∞) | real | yes |
| † If the delay is 0, this parameter may be omitted. If it is non-zero, enter the delay value. This can be calculated using the function delay_path() | ||||
Examples
a = sample_delay_qpsk(vout[1], 25e3, 1.5e-6, 0.15e-6)
Defined in
Built in
See Also
ber_pi4dqpsk(), ber_qpsk(), const_evm()
Notes/Equations
This function can be used only with 1-dimensional data.
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