Lin Chun-Ting, Ho Chun-Hung, Huang Hou-Tzu, Cheng Yu-Hsuan
Opt Lett. 2014 Mar 15;39(6):1358-61. doi: 10.1364/OL.39.001358.
This article proposes and experimentally demonstrates a radio-over-fiber system employing single-sideband single-carrier (SSB-SC) modulation at 60 GHz. SSB-SC modulation has a lower peak-to-average-power ratio than orthogonal frequency division multiplex (OFDM) modulation; therefore, the SSB-SC signals provide superior nonlinear tolerance, compared to OFDM signals. Moreover, multiple-input multiple-output (MIMO) technology was used extensively to enhance spectral efficiency. A least-mean-square-based equalizer was implemented, including MIMO channel estimation, frequency response equalization, and I/Q imbalance compensation to recover the MIMO signals. Thus, using 2×2 MIMO technology and 64-QAM SSB-SC signals, we achieved the highest data rate of 84 Gbps with 12 bit/s/Hz spectral efficiency using the 7-GHz license-free band at 60 GHz.
本文提出并通过实验证明了一种在60GHz采用单边带单载波（SSB-SC）调制的光纤无线系统。与正交频分复用（OFDM）调制相比，SSB-SC调制具有更低的峰均功率比；因此，与OFDM信号相比，SSB-SC信号具有更好的非线性容限。此外，广泛使用多输入多输出（MIMO）技术来提高频谱效率。实现了一种基于最小均方的均衡器，包括MIMO信道估计、频率响应均衡和I/Q不平衡补偿，以恢复MIMO信号。因此，使用2×2 MIMO技术和64-QAM SSB-SC信号，我们在60GHz的7GHz免许可频段上以12 bit/s/Hz的频谱效率实现了84Gbps的最高数据速率。
