In relay wireless systems, a data packet transmitted by a source node is forwarded by one or many relays nodes before reaching the destination node. In actual technologies, the destination recovers the identities of the sources and relays of received signals by using signaling information exchange before the data exchange and by including identities information (addresses) in data sequences. In this paper, we propose a novel nodes identification scheme, where a precoding sequence is embedded into the data sequence at each source and relay node, in a multi-sources multi-relays wireless system. The precoding sequences are Maximum Length Sequences (MLS). We propose to efficiently reduce the computational complexity at the receiver by using the Fast Walsh Hadamard Transform (FWHT). The proposed technique allows the destination node to recover the nodes identities without using additional signaling bits. Numerical results validate the proposed identification scheme performance.