On QoS-guaranteed downlink cooperative OFDMA Systems with amplify-and-forward relays: optimal schedule and resource allocation

  • Authors:
  • Danhua Zhang;Youzheng Wang;Jianhua Lu

  • Affiliations:
  • Dept. of Electronic Engineering, Tsinghua University, Beijing, P. R. China;Dept. of Electronic Engineering, Tsinghua University, Beijing, P. R. China;Dept. of Electronic Engineering, Tsinghua University, Beijing, P. R. China

  • Venue:
  • WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
  • Year:
  • 2009

Quantified Score

Hi-index 0.00

Visualization

Abstract

This paper considers joint schedule and resource allocation in downlink cooperative OFDMA systems with multiple sources, multiple relays and a single destination. Each user has individual QoS requirements and the relays operate in amplify-and-forward and half-duplex mode. We try to find optimal power allocation, relay selection and subcarrier assignment to maximize overall system rates. The problem is formulated as a Mixed Binary Integer Programming (MBIP). Although the original problem is comprehensive in nature, a novel two-level dual-primal decomposition based algorithm is proposed to tackle the problem. Optimal solutions are given in closed-form and the algorithm has a polynomial complexity in general. The efficiency of the algorithm is finally illustrated by numerical results.