On QoS-Guaranteed Downlink Cooperative OFDMA Systems with Amplify-and-Forward Relays: Optimal Schedule and Resource Allocation
On QoS-Guaranteed Downlink Cooperative OFDMA Systems with Amplify-and-Forward Relays: Optimal Schedule and Resource Allocation
复制标题
具有放大转发中继的 QoS 保证下行链路协作 OFDMA 系统：最优调度和资源分配
DOI：
10.1109/wcnc.2009.4917847
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Jianhua Lu
中科院分区：
文献类型：
--
作者：
D. Zhang;Youzheng Wang;Jianhua Lu
研究了多源多中继单目的下行协作OFDMA系统中的联合调度和资源分配问题。每个用户都有各自的QoS要求，中继器以放大转发和半双工模式工作。我们试图找到最佳的功率分配，中继选择和子载波分配，以最大限度地提高整个系统的速率。该问题被表述为一个混合二进制可编程（MBIP）。虽然原问题是全面的性质，一个新的两级双原始分解为基础的算法来解决这个问题。最优解以封闭形式给出，算法一般具有多项式复杂度。最后通过数值结果说明了算法的有效性。
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.