sentences:  Device to device (D2D) in LTE is a step toward Mobile Relays.In Cooperative-MIMO, the decoding process involves collecting NR linear combinations of NT original data symbols, where NR is usually the number of receiving nodes, and NT is the number of transmitting nodes.The decoding process can be interpreted as solving a system of NR linear equations, where the number of unknowns equals the number of data symbols (NT) and interference signals.