Cooperative Transmissions over Code Division Multiplexing Channels

We consider the problem of signature waveform design for code division multiplexing in wireless collaborative relay networks. In contract to conventional randomly chosen orthogonal codes, we develop an adaptive signature design strategy under the maximum predetection signal-to-interference-plus-noise-ratio (SINR) criterion. We evaluate numerically and by simulations the bit error rate (BER) and outage probability of cooperative wireless transmissions over code division multiplexing channels. Two basic decode-and-forward relay network architectures are considered and state-of-the-art performance is demonstrated.