peak_to_avg_pwr()

Returns the peak to average power ratio of the input voltage data

Syntax
peak_avg_ratio = peak_to_avg_pwr(voltage, percent, unit)

Arguments

Name	Description	Range	Type	Default	Required
voltage	baseband or complex envelope voltage signal	(-∞, ∞)	integer, real, complex		yes
percent	percentage of time the returned power value is exceeded	[0, 100]	real	0.0	no
unit	unit to be used	"dB"	"ratio"	string	"dB"	no

Examples

peak_avg_ratio = peak_to_avg_pwr(Vout[1], , "ratio")
where Vout is a named node in a Circuit Envelope simulation, will return the peak to average power ratio (as a ratio) at the fundamental frequency.
peak_avg_ratio = peak_to_avg_pwr(T1, 5, "ratio")
where T1 is the name of a TimedSink component (in a DSP schematic), will return the ratio of the power level that is exceeded 5% of the time to the average power level for the voltage signal recorded in the TimedSink. If the signal recorded by the TimedSink is complex envelope Gaussian noise with the same standard deviation for both the I and Q envelopes, then peak_avg_ratio will be very close to 2.99 ( -ln(0.05) ).
peak_avg_ratio = peak_to_avg_pwr(T1)
where T1 is the name of a TimedSink component (in a DSP schematic), will return the peak to average power ratio (in dB) for the voltage signal recorded in the TimedSink. If the signal recorded by the TimedSink is an ideal QPSK signal (filtered using a raised cosine filter of ExcessBW 0.5), then peak_avg_ratio will be very close to 3.95 dB. If the signal recorded by the TimedSink is an ideal π/4-DQPSK signal (filtered using a raised cosine filter of ExcessBW 0.5), then peak_avg_ratio will be very close to 3.3 dB.

Defined in

$HPEESOF_DIR/expressions/ael/digital_wireless_fun.ael

See Also

peak_pwr(), power_ccdf(), pwr_vs_t(), total_pwr()

Notes/Equations

Used in Circuit Envelope and Signal Processing simulations.
This expression can be used with input data (voltage) of any dimensions when the percent argument is 0 and up to three dimensions when the percent argument is greater than 0. The expression can accommodate both baseband as well as complex envelope data.

The peak to average ratio is computed by calling the peak_pwr() and total_pwr() expressions and then taking the ratio of the two values returned by these expressions. The percent argument is used for the calculation of the peak power value. For the use and meaning of the percent argument see the peak_pwr() Notes/Equations.

Since a ratio of power values is calculated a reference resistance is not needed for this measurement.