Asynchronous OFDM Space-Time Cooperative Diversity Scheme
Jingjing Bao · Communications technology · 2011
The asynchronous orthogonal frequency division multiplexing(OFDM) cooperative diversity scheme based on space-time block coding is proposed.OFDM modulation,time-reversion and complex conjugation of OFDM symbols are implemented at relay nodes,and each OFDM subcarrier of the received signals at destination node is of the Alamouti space-time coding structure,and the destination node adopts maximum likelihood(ML) decoding at destination.Simulation with Simulink indicates that this proposed scheme could achieve second-order diversity gain without the synchronization of between the two at relay nodes,has fairly low BER and is easy in implementation as compared with other cooperative schemes.