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针对高速移动环境下多业务多用户正交频分多址(OFDMA)系统下行链路提出一种动态资源分配方案,在保证每种业务用户信息传输速率和误比特率要求的前提下,利用信道状态信息(CSI)反馈和子载波间干扰(ICI)估计进行子载波和比特分配,以使系统总传输功率最小化。同时在保证系统基本性能的前提下提出一种基于概率统计的自适应CSI反馈算法,仿真结果表明,该算法在增加2.3%额外功率消耗的情况下可减少约60%的反馈CSI开销。
Aiming at the downlink of multi-service multi-user orthogonal frequency division multiple access (OFDMA) system in high-speed mobile environment, a dynamic resource allocation scheme is proposed. Under the premise of ensuring the information transmission rate and bit error rate of each service user, State information (CSI) feedback and Inter-Carrier Interference (ICI) estimation for sub-carrier and bit allocation to minimize the total system transmit power. At the same time, an adaptive CSI feedback algorithm based on probability statistics is proposed under the premise of ensuring the basic performance of the system. The simulation results show that this algorithm can reduce CSI feedback overhead by about 60% with a 2.3% additional power consumption.