Rate maximization algorithm for uplink wireless cooperative cellular networks

摘要

Cooperative relaying is a promising technique for present wireless communication networks such as Orthogonal Frequency Division Multiple Access (OFDMA) to satisfy high throughput demand andquality-of-service (QoS) requirements. A suboptimal relay selection, power allocation and sub carrier assignment scheme under a total power constraint is proposed for a QoS aware resource allocation for a cooperative network. The power allocation and subcarrier assignment problem are formulated as a joint optimization problem with the objective of maximizing achievable rate and relay selection is addressed by taking the best gain in the corresponding link. Cell edge users and users under shadoware degraded by the signal quality; hence cooperative relaying is a very promising solution to provide better data rate and coverage extension. Combining wireless communication and cooperative relaying assures high data rate enhancement for users at cell edge. Throughput enhancement problem is solved by two level dual decomposition. To further reduce the computational cost, low complexity suboptimal schemes are also proposed in this work. Simulation result indicates that the proposed scheme will guarantee the users QoS requirement.