摘要
设计了一种适用于正交频分复用(OFDM)的跨层自适应算法。此算法结合自适应调制(AM)和有限自动重传请求(ARQ)技术,能够根据不同的信道状态在物理层和数据链路层联合进行性能优化,可以在保证上层吞吐量一定的条件下提供更小的丢包率。仿真结果表明,通过跨层结构设计的系统和传统的分层结构设计的系统相比有一定的性能增益,在进行高速传输时此增益更为显著。
A cross -layer adaptive transmission algorithm for OFDM system is introduced. With combining adaptive modulation （AM） and truncated automatic repeat request （ARQ）, this algorithm is able to optimize performance jointly between physical layer and data link layer according to different channel statement, and guarantee less packet loss rate on condition of constant throughput. Simulation results show that the system designed by cross - layer structure can provide better performance than the one designed by traditional network structure, especially at high -rate transmission.
出处
《电讯技术》
2007年第6期35-39,共5页
Telecommunication Engineering
基金
国家自然科学基金资助项目(60496315)
关键词
正交频分复用
跨层设计
自适应调制
自动重传请求
OFDM
cross - layer design
adaptive modulation （AM）
automatic repeat request （ARQ）
