| 摘要: |
| 针对滤波OFDM（F-OFDM）系统对子带内定时同步要求严格的问题，提出了一种基于滤波器组的滤波多音（FMT）调制技术来实现F-OFDM的改进方案。通过滤波器组结构实现子载波级的滤波处理，采用载波频谱不重叠的FMT调制，改进方案降低了子带内严格的定时同步要求。仿真结果表明，所提方案可进一步将带外发射（OOBE）抑制到-65 dB深度，且在加性高斯白噪声（AWGN）信道和瑞利衰落信道下，具有较好的抗载波频率偏移（CFO）性能。相比于F-OFDM的直接实现，改进方案具有更低的运算复杂度。 |
| 关键词: 滤波OFDM 滤波器组 滤波多音 抗载波频率偏移 |
| DOI： |
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| 基金项目:国家科技重大专项(2016ZX03001010)；重庆市教委科学技术研究项目(KJ1704098) |
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| An improved filtered-OFDM scheme based on filtered multitone |
| TANG Ling,LI Yan |
| () |
| Abstract: |
| For the strict timing synchronization requirement among the subbands of the filtered-OFDM(F-OFDM) system，a modified scheme is proposed to realize the F-OFDM system through the filtered multi-tone (FMT) modulation technique based on the theory of filter banks.By the subcarrier level filtering processing based on the filter banks structure and adopting FMT modulation with non-overlapping carrier spectrum,the improved scheme named M-FB relieves the strict timing synchronization requirements. The simulation results show that the proposed scheme is capable of decreasing the out-of-band emission (OOBE) to -65 dB further,and performs well in anti-carrier frequency offset (CFO) performance in the case of additive white Gaussian noise (AWGN) channel or Rayleigh fading channel. Compared with the classical implementation of F-OFDM,the proposed scheme has lower computational complexity. |
| Key words: filtered-OFDM(F-OFDM) filter banks filtered multitone(FMT) anti-carrier frequency offset |
