摘要
该文研究满足用户速率需求的子载波配对、动态子载波分配和功率分配的联合优化,建立了使传输速率与用户期望速率之差最小化的优化数学模型.首先提出平均功率分配下基于用户期望速率的子载波配对和动态子载波分配算法(dynamic subcarrier allocation based on expected rate,ERDSA).为了保证用户的公平性,提出在系统资源不足时按比例减小接入用户期望速率的子载波配对和动态子载波分配算法(enhanced dynamicsubcarrier allocation based on expected rate,EERDSA).由于平均功率分配时,第1跳子载波与第2跳子载波的速率存在不完美匹配的问题,进而提出联合子载波配对、动态子载波分配和功率分配算法(dynamic jointsubcarrier and power allocation,DJSPA).分析表明3种算法的复杂度仅与子载波数呈线性关系,均为低复杂度的优化算法.仿真表明,这几种算法可满足用户的期望速率,降低系统功耗.
This paper addresses joint subcarrier pairing, dynamic subcarrier allocation and power allocation which satisfies user expected rate in OFDMA-based decode-and-forward relaying networks for which Users have different expected rate. A mathematical model for minimizing difference between the achievable and expected rates is established. Three algorithms are proposed. First, a joint subcarrier pairing and dynamic subcarrier allocation algorithm （ERDSA） with average power allocation is used. Second, if the system resource is insuf- ficient, a joint subcarrier pairing and dynamic subcarrier allocation algorithm （EERDSA） with proportionate reduction of user expected rate can be used. When the system power is evenly allocated, the data rates of the first and the second hops are mismatched. In this case, a joint subcarrier pairing, dynamic subcaxrier allocation and power allocation algorithm （DJSPA） is used. Analyses show that ERDSA, EERDSA and DJSPA have low complexity, linearly proportional to the number of subcarriers. Simulation shows that the proposed schemes can satisfy user expected rate and reduce power consumption.
出处
《应用科学学报》
EI
CAS
CSCD
北大核心
2011年第5期441-446,共6页
Journal of Applied Sciences
基金
国家科技重大专项基金(No.2011ZX03003-003-02)
国家自然科学基金(No.60972070
No.61171111)
重庆市自然科学基金(No.CSTC2009BA2090)
重庆市教委项目基金(No.KJ100514)资助
重庆邮电大学博士启动基金(No.A2011-02)
重庆市科委重点实验室专项经费资助
