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...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.展开更多
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,同时保证了目标BER性能,...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,同时保证了目标BER性能,得到的最佳门限值可以用于ITU-R M.1225 Vehicular Test A模型的自适应调制系统。展开更多
An analysis process is described for adaptive quadrature amplitude modulation(AQAM)of constant-power constant-symbol-rate over frequency-selective Rayleigh fading channels with inter symbol interference(ISI)and Gaussi...An analysis process is described for adaptive quadrature amplitude modulation(AQAM)of constant-power constant-symbol-rate over frequency-selective Rayleigh fading channels with inter symbol interference(ISI)and Gaussian noise.The delay spread resistance of the AQAM scheme is put forward by studying its average throughput and average bit-error-rate(BER),both of which can be expressed as functions of two variables,the ratio of root mean square(RMS)delay spread to symbol period and the ratio of average symbol energy to noise.Average throughput reacts regularly to the latter,whereas it does not react to the former.The AQAM scheme is highly superior in the delay spread resistance in comparison with the fixed modulation modes.Gains of the AQAM scheme over the fixed modes become more significant as the delay spread becomes severer or the average throughput decreases.展开更多
文摘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.
文摘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,同时保证了目标BER性能,得到的最佳门限值可以用于ITU-R M.1225 Vehicular Test A模型的自适应调制系统。
基金National Natural Science Foundation of China(No.61071087)Research contract from Shandong University of Scienceand Technology(Chun Lei2009BWZ037)
文摘An analysis process is described for adaptive quadrature amplitude modulation(AQAM)of constant-power constant-symbol-rate over frequency-selective Rayleigh fading channels with inter symbol interference(ISI)and Gaussian noise.The delay spread resistance of the AQAM scheme is put forward by studying its average throughput and average bit-error-rate(BER),both of which can be expressed as functions of two variables,the ratio of root mean square(RMS)delay spread to symbol period and the ratio of average symbol energy to noise.Average throughput reacts regularly to the latter,whereas it does not react to the former.The AQAM scheme is highly superior in the delay spread resistance in comparison with the fixed modulation modes.Gains of the AQAM scheme over the fixed modes become more significant as the delay spread becomes severer or the average throughput decreases.
