1. Note that the frame configuration described here is a particular example from a multitude of possible configurations. For a given number of users, the frame configuration can be optimized so as to minimize the size of buffers required in the transmitters and receivers.
2. System performance can be simulated using the empirical system model without making simplifying assumptions of the chaotic maps or the forms of the various mean, variance and co-variance terms. Simulations performed in this way can be considered as “brute-force” simulations, and they provide true system performance for comparison and verification purposes. See also p. 52.
3. The permutation matrix is defined as a square matrix whose elements are either “0” or “1”, with each row and column containing exactly one “1” [Stewart (1998)].