sah

Sample and hold oversampling.

Namespace: dsp::telecom

Prototype

Vector<T> sah(const Vector<T> &x, int R)

Parameters

x	Input vector.
R	Number of samples to hold (e.g. oversampling factor).

Returns

Oversampled signal.

Description

Each sample of the input signal is repeated \(R\) times. For instance, if \(R = 2\), and \(x = x_0, x_1, \dots\), then \(y = x_0, x_0, x_1, x_1, \dots\)

This function can be used to generate NRZ sequence.

Example 1: duplicating values

Vecf x(5);
x << 0, 1, 2, 3, 4;
Vecf y = sah(x, 2);
// y = [0, 0, 1, 1, 2, 2, 3, 3, 4, 4]

Example 2: generating a pseudo-random NRZ sequence

int nsymbs = 5;  // Number of symbol to generate
int osf    = 10; // Over-sampling ratio
Vecf y = sah(randb(nsymbs), osf);
// Will generate nsymbs * osf samples (each symbol is repeated osf times)