Use of delay tolerant space time codes to combat synchronization errors in cooperative networks

With the evolution of wireless systems, cooperative communications are promoted as promising candidate for future radio access technologies. However, due to the different processing and propagation delays among distributed relays, cooperative networks can be asynchronous. A possible solution is to apply a distributed synchronization which unfortunately increases the amount of needed power and time for the communication. Therefore, space time codes that can tolerate the delays are used here in cooperative networks in order to reduce this additional signaling for several multiple access technologies. The performance enhancement of the proposed scheme compared to another existing code is shown by numerical simulations.