Example 7.3
A mobile radio data link uses interleaving to spread
the data errors on reception. If the interleaving depth used is a 10 x 8 matrix, and the
bit rate for the signal is 9600 bps, what is the latency introduced by the interleaving
process?
Solution

The de-interleaving process requires that the matrix
rows are full up before the data can be read out from the columns, thus 8 x 10 bits
= 80 bits must be read into the matrix before the de-interleaved data can be extracted. The
data rate is 9600 bps, thus the time taken to load the matrix is 80 / 9600
= 8.3 ms. A further 8.3 ms will be used loading the interleaving matrix in the transmitter, giving a
total latency of 16.6 ms.