Multiple CFO estimation and compensation in cooperative communication systems

Through employing cooperative relay nodes, multiple carrier frequency offsets (MCFO) appear due to the different accuracy of the nodes´ oscillators. In order to guarantee the orthogonality of cooperative nodes, the MCFO and channel frequency response (CFR) should be estimated and then compensated at the destination node. In this article, a practical MCFO synchronization and CFR estimation algorithm, including MCFO estimator, CFR estimator and MCFO equalizer, is proposed. Simulation results illustrate that the proposed solutions achieve graceful mean square error and BER performance with large range of MCFO.