摘要
由于SC-FDMA的峰均功率比(PAPR)比OFDMA低,因而被应用于3GPP LTE上行链路。论文分析了SC-FDMA传输系统的数学模型,介绍了基于导频的SC-FDMA系统最小二乘(LS)和线性最小均方误差(LMMSE)信道估计算法。在比较该系统集中式和分布式两种子载波映射方式在高低速不同移动环境下传输性能的基础上,提出了一种基于信道估计的SC-FDMA系统自适应传输方案。经仿真证实该方案比单纯采用一种子载波映射的方法性能更加优越,在相同的误码率情况下,能够节省大概3dB左右的信噪比。
SC-FDMA is used in uplink of 3GPP LTE because its PAPR is lower than OFDMA.It analyses the mathematical model of SC-FDMA transmission system,and introduces the Least-Square（LS） and Linear Minimum Mean-Square Error（LMMSE） channel estimation algorithm based on pilot with SC-FDMA system.Moreover,based on a comparison of the transmission performance between two subcarrier mapping methods of this system in different mobile environment,an adaptive transmission scheme based on channel estimation of SC-FDMA system is proposed.The simulation results show that the scheme＇s performance is better than the method which uses a single subcarrier mapping.In the same BER situation,the proposed scheme can save about 3dB SNR.
出处
《计算机技术与发展》
2012年第3期35-38,42,共5页
Computer Technology and Development
基金
广州市应用基础研究项目(2006J1-C0331)
广东工业大学博士基金项目(073016)
