Performance comparison between iterative waterfilling and cooperative broadcasting for frequency selective channels

Transmission schemes for a two-user wireless network are studied. The performance of a non-cooperative scheme called iterative waterfilling is compared with that of a cooperative scheme called cooperative broadcasting. Their characteristics in various conditions are studied and their achievable sum rates are compared. Numerical results show that cooperative broadcasting outperforms iterative waterfilling as long as the inter-source link gain and the cross link gain are both large.