Correlated spreading sequences for high rate non-coherent communication systems

摘要

The invention relates notably to a method for modulating information symbols to be transmitted in a CDMA communication network by using a non-orthogonal modulation code comprising M spreading sequences (sm 1 ≤ m ≤ M), each consisting in N chips (sm,n 1 ≤ n ≤ N), the M spreading sequences having the same energy. According to the invention, the amplitude of the chips take a plurality of values the number M of spreading sequences is higher than the number of chips N per spreading sequence. <IMAGE>