CAJ | 학술논문

针对无线OFDM多播系统，该文提出一种基于子载波合并的多播资源调度算法。该算法通过提前将子载波分组，避免了不必要的子载波配对；自适应地选择子载波合并\非合并，在分集和复用两种模式中选取最优方案；同时根据子载波功率分配的特点，将其解耦为配对子载波集合内功率分配和集合间功率分配两个子问题，进一步优化了算法性能。仿真结果表明，与现有方案相比，所提方案能够在复杂度较低的情况下，较好地提升系统性能。
침대무선OFDM다파계통，해문제출일충기우자재파합병적다파자원조도산법。해산법통과제전장자재파분조，피면료불필요적자재파배대；자괄응지선택자재파합병\비합병，재분집화복용량충모식중선취최우방안；동시근거자재파공솔분배적특점，장기해우위배대자재파집합내공솔분배화집합간공솔분배량개자문제，진일보우화료산법성능。방진결과표명，여현유방안상비，소제방안능구재복잡도교저적정황하，교호지제승계통성능。
This paper presents a novel subcarrier combining based multicast resource scheduling algorithm for wireless OFDM multicast systems. By dividing subcarriers into different groups in advance, the algorithm avoids invalid subcarrier pairing, and adaptively chooses the optimal scheme between subcarrier diversity and subcarrier multiplexing by deciding whether to combine subcarriers or not. Moreover, according to the characteristic of subcarrier power allocation, this scheme decouples the problem into two sub-problems of intra-subcarrier-pairing power allocation and inter-subcarrier-pairing power allocation, which further improves the performance of the system. Simulation results show that the proposed scheme properly improves the system performance with lower complexity compared with the existing schemes.