欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
自适应调制根据瞬时信道信噪比选择适当的调制方式,能够改善系统的BER性能以及平均吞吐量性能.在常用于高速移动环境的六径瑞利衰落信道模型下,研究自适应调制系统的最佳信噪比门限值,使系统的平均吞吐量最大,同时能够保证系统达到目标BER性能.得到的最佳信噪比门限值可以用于ITU-RM.1225 Vehicular Test A模型的自适应调制系统.给出了最佳信噪比门限值用于IEEE802.16e OFDM自适应调制系统的性能仿真,并对仿真结果进行了分析.
英文摘要：
Adaptive modulation techniques can improve the BER （bit error rate） performance or the average throughput by employing a suitable modulation mode depending on the instantaneous channel SNR （signal-to-noise ratio）.In this paper the optimum SNR thresholds over a 6-path Rayleigh channel are derived,which shows a superior BPS （bit per symbol） throughput performance while maintaining the target average BER. The 6-path Rayleigh channel is often applied to mobile environment with highspeed. The results achieved in this paper can be applied to the adaptive modulation system with the channel of ITU-R M. 1225 Vehicular Test A mode.Performance simulation of the derived thresholds in the IEEE802.16e OFDM system is presented and then the simulation results are analyzed.
同期刊论文项目
同项目期刊论文
Signal Constellations Design for Differential Unitary Space-time in MIMO-OFDM System over Frequency-
Cross-Layer Combining of Power Control and Adaptive Modulation with Truncated ARQ for Cognitive Radi
位置：