结合非正交子载波的空频索引调制技术

Space and frequency index modulation technique combining non-orthogonal subcarrier

广义空频索引调制(generalized space and frequency index modulation,GSFIM)技术的提出显示了其相比传统多输入多输出正交频分复用技术更优的系统性能。然而,GSFIM有着较复杂的系统结构以及高复杂度的检测器。讨论一种特殊形式的空频索引调制技术,即基于频率正交幅度调制(frequency and quadrature amplitude modulation,FQAM)/频相移键控(frequency and phase shift keying,FPSK)的空间调制(spatial modulation,SM)技术,其大大简化了系统结构。为了进一步提升该系统的频谱效率,提出了结合非正交子载波的FQAM/FPSK-SM。仿真结果表明,在不同的参数配置下,通过调整压缩系数,非正交FQAM/FPSK-SM系统不仅能够带来频谱效率的提升,而且能够在发送速率相同的前提下达到与正交系统基本相同的性能,提高了系统的单位带宽吞吐量。

Generalized space and frequency index modulation(GSFIM)shows better performance compared with traditional multiple input multiple output-orthogonal frequency division multiplexing(MIMO-OFDM).However,GSFIM has a complex system structure and a detector of high computational complexity.We research a peculiar space and frequency index modulation system,i.e.Spatial modulation(SM)based on frequency and quadrature amplitude modulation(FQAM)/frequency and phase shift keying(FPSK),which greatly simplifies the system structure.In order to improve the spectral efficiency of the system,we propose FQAM/FPSK-SM combining non-orthogonal subcarrier.Simulation results show that under the different parameter configurations,the proposed scheme not only enhances the spectral efficiency,but also achieves the nearly same performance as FQAM/FPSK-SM with the same transmit rate and improves throughput of unit bandwidth by adjusting the compression coefficient.