OFDMA系统动态资源分配快速算法

Fast dynamic resources allocation algorithm for OFDMA system

针对正交频分多址接入无线网络的下行链路,提出了一种计算量少、能够依据信道状态信息进行动态资源分配、满足多个用户服务质量要求的算法.该方法首先假设各个用户发射功率相同,按比例分配子载波,然后按照每个用户最小速率需求,确定各个用户最小发射功率,最后根据总功率大小以及用户所需最小发射功率,最大化整个系统容量.分析表明该方法可以得到接近最优的发射功率,资源调度策略具有多项式复杂度,仿真结果验证了理论的正确性,算法能够在短时间内进行子载波分配和功率控制,满足无线通信实时性要求.

To meet the quality of service requirement of multiple users in orthogonal frequency division multiple access wireless network downlink, a low complexity dynamic resources allocation algorithm is proposed. According to channel state information （CSI）, firstly the subcarriers are assigned to every user in a rough proportionality, based on the assumption of same transmitting power. Secondly, the minimum power is allocated to each user in order to meet its rate requirement. Finally, the overall throughput of the system is maximized under the constraint of both the total power and the users＇ minimum power. Theoretical analysis and numerical results show that the proposed scheme can achieve near-optimum transmit pow- er of user. Moreover, the proposed algorithm is of polynomial complexity, which can adaptively allocate resources in a short time, and meet the real time requirement for wireless communication.