摘要
针对协作单载波频分多址(single-carrier frequency-division multiple access, SC-FDMA)系统提出了一种信干噪比约束下的中继波束赋形和用户功率分配联合优化算法。该算法能使得基站端输出信干噪比满足给定约束条件的同时最小化中继节点和用户节点的发射功率。该文通过利用矩阵分析中的瑞利商理论以及交替优化理论,分析并推导得出了最优的中继节点波束赋形和用户功率分配算法。仿真结果及分析表明,该文提出的中继波束赋形和用户功率分配算法与采用正交频分复用系统下的算法相比能有效地节省中继和用户节点的发射功率。此外,为了降低算法复杂度以及所需反馈开销,该文还给出了用户端等功率分配的方法以及在此基础上的中继波束赋形算法。
A joint optimization algorithm of relay beamforming and user power allocation is proposed for cooperative single-carrier frequency-division multiple access (SC-FDMA) systems with signal-to-interference-plus-noise ratio (SINR) constraint. The proposed algorithm can minimize the transmit powers for the relay and user while maintaining the output SINR at the base station above a pre-specified SINR threshold. The optimal solution for the optimization problem is derived and analyzed by employing Rayleigh quotient and the alternative optimization theory. Simulation results and analysis show that the proposed beamforming algorithm can save more transmit powers for the relay and user compared with the algorithm used in orthogonal frequency division multiplexing systems. Moreover, in order to reduce the computational complexity and feedback overhead, equal power allocation for the user and the corresponding relay beamforming algorithm are also proposed.
作者
赵龙海
沙学军
ZHAO Longhai;SHA Xuejun(School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2019年第7期1633-1638,共6页
Systems Engineering and Electronics
基金
国家自然科学基金(61671179)资助课题
关键词
中继波束赋形
单载波频分多址系统
协作通信
功率分配
relay beamforming
single-carrier frequency-division multiple access (SC-FDMA)
cooperative communications
power allocation
