A Low-Complexity Receiver for Cooperative Simultaneous Relaying

The authors consider the impact of carrier frequency offsets arising naturally when multiple relay terminals transmit simultaneously using a space-time code in a cooperative relaying scenario. In such a scenario, they design an adaptive, low-complexity receiver that attempts to eliminate the effect of frequency offsets. The adaptive receiver allows for decoupling of the decision making of transmitted symbols utilizing the orthogonality of the underlying space-time code. In a quasi-static Rayleigh fading channel, they demonstrate the performance of the adaptive receiver over a range of frequency offsets by considering two transmitting relays.