基于调制分集的MIMO DFT-S-OFDM系统

以离散傅里叶变换扩展正交频分复用（discrete Fourier transform spread orthogonal frequency division multiplexing,DFT-S-OFDM）技术为核心的单载波频分多址（single carrier frequency division multiple access,SC-FDMA）方案,已经成为第三代合作伙伴计划长期演进项目上行多址技术标准。提出了一种基于调制分集的多入多出（multiple input multiple output,MIMO）DFT-S-OFDM方案。该方案将调制分集和Turbo码相结合,有效利用时间分集和空间分集特性,在衰落信道下,既可以使系统具有较低误码性能,又可以获得较高的频谱效率。仿真结果表明,在最优旋转角度下,通过较小复杂度的增加,提出的系统与传统基于比特交织编码调制技术的MIMO DFT-S-OFDM系统相比,可获得明显的性能优势。

MIMO DFT-S-OFDM system based on modulation diversity

The single carrier frequency division multiple access(SC-FDMA) scheme taking discrete Fourier transform spread orthogonal frequency division multiplexing(DFT-S-OFDM) as the core of technology has been adopted as the third generation partnership project-long term evolution standard for uplink transmission.In this paper,a novel MIMO DFT-S-OFDM system based on modulation diversity is proposed.Combining with effective use of time diversity and space diversity,this proposed scheme joints the Turbo coding and modulation diversity together,and provides high-performance,high spectral efficiency and low error rate under the fading channel.The simulation results show that under the optimum rotation angle,the proposed scheme outperforms the conventional MIMO DFT-S-OFDM scheme based on bit-interleaved coded modulation with a little increase in complexity.