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研究了多用户场景下多载波码分多址系统(MC-CDMA)的下行信道和功率分配,并将吞吐最大化问题建模成一个混合整数优化问题.为了简化分析,将问题分成2个低复杂度的子问题:功率分配和信道分配.这2个子问题可分别被一个次最优自适应功率分配算法(APA)和一个最优自适应信道分配算法(ACA)解决.通过联合APA和ACA算法,进一步提出了一个自适应信道和功率的分配方案.仿真结果表明:与传统的均匀功率分配算法相比,提出的APA算法更加适用于MC-CDMA系统;此外,提出的自适应信道和功率分配方案可以显著地提高系统吞吐量性能.
The downlink channel and power allocation of multi-carrier CDMA systems in multi-user scenarios are studied and the throughput maximization problem is modeled as a mixed-integer optimization problem.In order to simplify the analysis, the problem is divided into two low Complexity sub-problems: power allocation and channel allocation, which can be solved by a suboptimal adaptive power allocation algorithm (APA) and an optimal adaptive channel allocation algorithm (ACA) respectively. By combining APA and ACA Algorithm, an adaptive channel and power allocation scheme is proposed. The simulation results show that compared with the traditional uniform power allocation algorithm, the proposed APA algorithm is more suitable for MC-CDMA systems. In addition, the proposed adaptive channel and power Distribution schemes can significantly improve system throughput performance.