论文标题
在两跳继电器通道中实现联合源和中继横梁设计的全球最优性
Achieving Global Optimality for Joint Source and Relay Beamforming Design in Two-Hop Relay Channels
论文作者
论文摘要
本文介绍了放大和前向（AF）多室内多雷雷网络的联合源和中继束形式（BF）设计。考虑到从继电器到目的地的通道状态信息（CSI）是不完善的，我们旨在最大化接收到的信噪比（SNR）的最坏情况。然后以两个步骤解决关联的优化问题。在第一步中，通过固定源BF矢量，可以获得继电器BF矩阵的半闭合形式解，直至功率分配因子。在第二步中，基于多块外近似（PA）算法获得了全局最佳源BF矢量。我们还提出了两种用于获取源BF载体的低复杂方法，它们的复杂性和性能不同。通过提出的算法获得的最佳联合源 - 列层BF解决方案是评估现有方案和提议的低复杂方法的基准。仿真结果表明，提出的强大设计可以显着降低通道不确定性对系统性能的敏感性。
This paper deals with joint source and relay beamforming (BF) design for an amplify-and-forward (AF) multi-antenna multirelay network. Considering that the channel state information (CSI) from relays to destination is imperfect, we aim to maximize the worst case received signal-to-noise ratio (SNR). The associated optimization problem is then solved in two steps. In the first step, by fixing the source BF vector, a semi-closed form solution of the relay BF matrices is obtained, up to a power allocation factor. In the second step, the global optimal source BF vector is obtained based on the Polyblock outer Approximation (PA) algorithm. We also propose two low-complexity methods for obtaining the source BF vector, which are different in their complexities and performances. The optimal joint source-relay BF solution obtained by the proposed algorithms serves as the benchmark for evaluating the existing schemes and the proposed low-complexity methods. Simulation results show that the proposed robust design can significantly reduce the sensitivity of the channel uncertainty to the system performance.
