pulse2pda

Peak distortion analysis eye from pulse response

Syntax

[E,TH,D] = pulse2pda(P,N,M)

[E,TH,D] = pulse2pda(___,DC)

Description

[E,TH,D] = pulse2pda(P,N,M) calculates the peak distortion analysis (PDA) eye from a pulse response P with N samples per symbol and M levels of modulation.

[E,TH,D] = pulse2pda(___,DC) also maintains the DC offset present in the pulse response P if DC is set to true.

Examples

Create Peak Distortion Analysis Eye from Pulse Response

Load the pulse response column matrix from a file.

load('PulseResponseReflective100ps.mat');

Use the nonreturn to zero (NRZ) modulation scheme. Disregard any DC offset present in the pulse response.

M = 2;
DC = false;

Calculate and plot the peak distortion analysis (PDA) eye.

[pdaeye,th] = pulse2pda(pulse,SamplesPerSymbol,M,DC);
figure
t = th*SymbolTime*1e12;
plot(t,pdaeye)
legend('Upper PDA eye','Lower PDA eye')
xlabel('ps')
ylabel('V')
title('Peak Distortion Analysis Eye')
grid on

Input Arguments

P — Pulse response

column matrix

Input pulse response, specified as a column matrix. The first column contains the primary pulse response and the subsequent columns (if any) contain the crosstalk pulse responses.

Data Types: double

N — Number of samples per symbol

positive integer scalar

Number of samples per symbol, specified as a positive integer scalar.

Data Types: double

M — Number of modulation levels

positive integer scalar greater than or equal to 2

Number of modulation levels, specified as a positive integer scalar. M defines the modulation scheme used in the peak distortion analysis (PDA) calculation.

• If M = 2, the modulation scheme is nonreturn to zero (NRZ).

• If M = 4, the modulation scheme is four-level pulse amplitude modulation (PAM4).

Data Types: double

DC — Determine whether to maintain DC offsets in pulse response

true | false

Determine whether to maintain the DC offsets in pulse response P.

• If DC is set to true, the pulse2pda function maintains the DC offsets present in the pulse response.

• If DC is set to false, the pulse2pda function disregards the DC offsets present in the pulse response.

Data Types: double

Output Arguments

E — Peak distortion analysis eye

vector

Peak distortion analysis (PDA) eye, returned as a vector.

Data Types: double

TH — Time histogram bin centers

vector

Horizontal time histogram bin centers, returned as a vector.

Data Types: double

D — Upper pattern of PDA eye limit

vector

Upper pattern of the PDA eye limit, returned as a vector.

Data Types: double

Version History

Introduced in R2020a