基于正交变换的广义多载波系统自适应传输方案

Adaptive transmission scheme of generalized multi-carrier system based on orthogonal transformation

针对基于正交变换的广义多载波系统(OT-GMC),提出一种正交变换模式和调制编码方式联合自适应的单载波混合传输方案。该方案以最大化频谱效率为优化准则,依据接收信号的信干噪比(SINR)自适应切换正交变换模式和调制编码方式。当正交变换采用恒等变换时,对子带数据进行独立的链路自适应,提高了频谱效率。当正交变换采用离散傅里叶变换时,发射信号具有较低的峰均比,提高了发射端的功放效率。该传输方案实质上获得了单载波混合传输系统内频谱效率和峰均比的最优化折中性能。仿真表明,多径信道下该混合传输方案的吞吐量性能优于单一传输方案。

A joint adaptive hybrid single-carrier transmission scheme of orthogonal transformation mode and modulation and coding scheme （MCS） was proposed for orthogonal transformation generalized multi-carrier system （OT-GMC）. The scheme achieved the maximal spectrum efficiency by adaptive switching the orthogonal transformation mode and MCS according to effective SINR. When identical transformation was used, the data of each sub-band could be transmitted adaptively and independently. As a result, the spectrum efficiency could be improved. When DFT was used, the signal had lower PAPR and it improved the efficiency of power amplifier. Essentially, this transmission scheme obtains the most optimum compromise performance of spectrum efficiency and PAPR in single-cartier hybrid transmission system. The simulation results show that the presented scheme is better than the single transmission scheme in the aspect of throughput performance.