“…In an MC-CDMA system [8,9] a block of M information symbols from each active user are spread in the frequency domain into N = L.M subcarriers, where L represents the spreading factor. This is accomplished by multiplying every symbol of the block for user k, where , by a spreading code , selected from a set of L orthogonal sequences, thus, allowing a maximum of L simultaneous users to share the same radio channels.…”