摘要： LTE-A上行每帧数据在自适应传输时，不能实时切换为分簇的DFT-S-OFDM和N×SC-FDMA系统。为此，提出一种联合自适应调制编码方法。该方法依据接收端的信干噪比，分别预测下一帧在采用分簇的DFT-S-OFDM和N×SC-FDMA进行自适应传输时的吞吐量，选择吞吐量大的系统及相应的调制编码方式在下一帧使用，可获得分簇的DFT-S-OFDM和N×SC-FDMA系统在自适应传输时频谱效率的联合性能。仿真结果表明，与单一自适应系统相比，该方法在多径信道下的吞吐量性能能够取得1 dB增益。

关键词: 离散傅里叶变换扩频的正交频分复用, 单载波频分多址, 信干噪比, 自适应传输, 自适应调制编码, 吞吐量

Abstract: Aiming at the problem that each frame cannot switch the system between DFT-S-OFDM and N×SC-FDMA in real-time adaptive transmission of LTE-A’s uplink, a hybrid Adaptive Modulation and Coding(AMC) method is proposed. According to SINR, the method predicts the throughput of DFT-OFDM and N×SC-FDMA in the situation of adaptive transmission, and chooses the system which has greater throughput and the corresponding MCS for the next frame. This method obtains the hybrid performance of spectrum efficiency of DFT-OFDM and N×SC-FDMA in adaptive transmission. Simulation results show that this method can get 1 dB gain in the aspect of throughput performance, compared with the single adaptive transmission system.

Key words: DFT-Spreading-Orthogonal Frequency Division Multiplexing(DFT-S-OFDM), Single Carrier-Frequency Division Multiple Access (SC-FDMA), Signal to Interference and Noise Ratio(SINR), adaptive transformation, Adaptive Modulation and Coding(AMC), throughput

中图分类号: 

• TN911.3