摘要
比较了不同正交幅度调制方式下单载波频分多址接入(SC-FDMA,Single Carrier FrequencyDivision Multiple Access)和正交频分多址接入(OFDMA,Orthogonal Frequency Division MultipleAccess)2种多址接入技术的峰均功率比(PAPR,Peak-to-Average Power Ratio),得出相比较OFDMA而言,SC-FDMA具有较低的PAPR,但是受调制方式影响较大。接着讨论了限幅后信号的PAPR对误差向量幅度的影响,给出了LTE上行系统选择模拟器件模数转换器/数模转换器(ADC/DAC)的指导参数。
The comparison of the PAPR between SC-FDMAand OFDMAby different modulation modes indicates the conclusion that SC-FDMA has a comparatively low PAPR/CM but is sensitive to the modulation modes. Then the impact of PAPR to error vector magnitude, where Clipping is applied to reduce PAPR, is discussed, and thus some guidance parameters in choosing the ADC/DAC for the uplink of LTE system are also given.
出处
《通信技术》
2012年第1期41-43,共3页
Communications Technology
关键词
单载波频分多址接入
峰均比
限幅
误差向量幅度
有效位数
SC-FDMA
peak-to-average power ratio
clipping
error vector magnitude
effective number of bits
