摘要
研究了多进制正交幅度调制QAM(Quadrature Amplitude Modulation)和基于码合并的混合重传方案(Hybrid Automatic Repeat reQuest,HARQ)的基本原理,分析了高级在轨系统AOS(Advanced Orbiting System)中基于chase合并和基于递增冗余IR的HARQ方案的系统性能,主要研究了不同调制方式对混合重传方案的吞吐量等性能参数的影响。仿真结果显示,对于基于码合并的HARQ方案,采用高阶的调制方式可以有效提高系统吞吐量性能,当采用相同的调制方式时,基于递增冗余IR的HARQ方案的吞吐量等性能高于基于chase合并的HARQ方案。
It describes the principle of a m-ary quadrature amplitude modulation （QAM） and the hybrid automatic repeat request scheme based on the code merge and has a system performance analysis with the HARQ scheme based on a chase combining and the HARQ scheme based on incremental redundancy. The paper mainly studies the influence of the different modulation methods on HARQ scheme in throughput, error rate, the average number of transmissions and other performance parameters. Simulation results show that, under the same channel conditions, with the increase in the number of QAM modulation order, the throughput of the HARQ scheme based on code merge increases, at the same time the bit er- ror rate and the frame average number of transmission increases. When the channel condition is gradually improved the high order modulation scheme can effectively improve the throughput values of the hybrid ARQ system, and the bit error rate and the average number of transmissions is also maintained at a low level, and can both satisfy the requirements for the transmission efficiency and reliability in the communication system.
出处
《沈阳理工大学学报》
CAS
2013年第2期11-15,共5页
Journal of Shenyang Ligong University
基金
辽宁省高等学校杰出青年学者成长计划(LJQ2012018)
辽宁省高等学校创新团队资助项目(LT2011T005)
关键词
AOS
混合重传方案
多进制调制
AOS
hybrid automatic repeat request
m-ary modulation
