Minimum Power Multicast Beamforming With Superposition Coding for Multiresolution Broadcast and Application to NOMA Systems
Minimum Power Multicast Beamforming With Superposition Coding for Multiresolution Broadcast and Application to NOMA Systems
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DOI：
10.1109/tcomm.2015.2394393
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发表时间：
2015-03-01
影响因子：
8.3
通讯作者：
Choi, Jinho
中科院分区：
文献类型：
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作者：
Choi, Jinho
研究了用于多分辨率广播的具有叠加编码（SC）的多播波束成形，其中高优先级（HP）和低优先级（LP）的数据流都将被发送给靠近基站（BS）的用户，而仅LP的数据流将被发送给不靠近BS的用户（例如，小区边缘用户）。使用SC，一个最小的总发射功率波束成形问题已经制定找到波束成形向量和功率为两个用户。对于给定的归一化波束形成向量，推导出最优功率分配的封闭形式的表达式，从该表达式中可以考虑迭代算法来找到波束形成向量。提出的多播波束形成与SC被应用到非正交多址接入（NOMA）系统，以支持多个用户作为一个两阶段的波束形成方法。
Multicast beamforming with superposition coding (SC) is studied for multiresolution broadcast where both data streams of high priority (HP) and low priority (LP) are to be transmitted for a user close to a base station (BS), while only data stream of LP is to be transmitted to a user not close to the BS (e.g., a cell-edge user). Using SC, a minimum total transmission power beamforming problem has been formulated to find beamforming vectors and powers for both users. For given normalized beamforming vectors, a closed-form expression for the optimal power allocation is derived from which an iterative algorithm is considered to find beamforming vectors. The proposed multicast beamforming with SC is applied to nonorthogonal multiple access (NOMA) systems to support multiple users as a two-stage beamforming method.