摘要
针对具有非对称通信需求的单中继协同放大转发-正交频分复用(amplify forward orthogonal frequency division multiplexing,AF-OFDM)双向中继系统,提出一种中继能效优化策略。在AF-OFDM双向非对称中继通信系统中,子载波有两种工作模式:单向中继传输和双向中继传输。以系统能效为优化目标,构建联合中继传输模式选择、功率分配和比特加载组合优化模型;采用结构近似优化算法,首先固定子载波分配集合,优化单向中继传输和双向中继传输的功率分配,将原优化问题分解为两个子优化问题求解,然后优化子载波分配集合,利用子载波配对形成的线性结构搜索双向中继传输的最佳子载波数,避免穷举搜索造成的大运算量。仿真结果表明,该能效优化策略能有效提高AF-OFDM双向非对称中继通信系统的能量效率。
The energy-efficiency optimization strategy is studied for the amplify forward orthogonal frequen- cy division multiplexing （AF-OFDM） two-way relaying system with asymmetric traffic demand. Subearrier has two working modes： one-way relaying transmission and two-way relaying transmission. Taking the system en- ergy-efficiency as the optimization objective, a combination optimization model of joint relaying transmission mode selection, power allocation and bit loading is structured. Firstly, fix the subcarrier allocation set, decom- pose the original optimization problem into two suboptimization problems, optimize power allocation of the one- way relaying transmission and two-way relaying transmission. Then, the optimal subcarrier number of the two- way relaying transmission is searched by using the linear structure formed by the subcarrier pairing, and opti- mize the subearrier allocation set. Simulation results show that the proposed strategy can improve the energy-ef- ficiency of the AF-OFDM two-way relaving system with asymmetric traffic.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2015年第11期2591-2597,共7页
Systems Engineering and Electronics
基金
重庆市自然科学基金重点项目(CSTC2009BA2064)资助课题
关键词
能效优化
双向中继
放大转发
正交频分复用
energy-efficiency optimization
two-way relaying
amplify-and-forward （AF）
orthogonal fre-quency division multiplexing （OFDM）
