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兰州理工大学计算机与通信学院,甘肃 兰州 730050
[ "王惠琴(1971-),女,甘肃渭源人,教授,博士生导师,2011年于西安理工大学获得博士学位,主要从事无线光通信理论与与技术研究。E-mail:Whq1222@lut.edu.cn" ]
[ "豆红霞(1996-),女,甘肃张掖人,硕士研究生,主要从事无线光通信方面的研究。E-mail:Dou_hongxia @126.com豆红霞(1996-),女,甘肃张掖人,硕士研究生,主要从事无线光通信方面的研究。E-mail:Dou_hongxia @126.com" ]
收稿日期:2020-10-03,
修回日期:2020-10-27,
纸质出版日期:2021-09-15
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王惠琴,豆红霞,曹明华等.大气湍流信道中的广义索引调制非对称限幅光OFDM[J].光学精密工程,2021,29(09):2268-2277.
WANG Hui-qin,DOU Hong-xia,CAO Ming-hua,et al.Asymmetrically clipped optical OFDM with generalized index modulation for atmospheric turbulent channel[J].Optics and Precision Engineering,2021,29(09):2268-2277.
王惠琴,豆红霞,曹明华等.大气湍流信道中的广义索引调制非对称限幅光OFDM[J].光学精密工程,2021,29(09):2268-2277. DOI: 10.37188/OPE.20212909.2268.
WANG Hui-qin,DOU Hong-xia,CAO Ming-hua,et al.Asymmetrically clipped optical OFDM with generalized index modulation for atmospheric turbulent channel[J].Optics and Precision Engineering,2021,29(09):2268-2277. DOI: 10.37188/OPE.20212909.2268.
索引调制光OFDM虽可实现高频谱效率,但其误码性能还不够理想。为此,本文结合非对称限幅光OFDM技术,通过每组激活数目不等的子载波,提出了一种广义索引调制非对称限幅光OFDM(Asymmetrically Clipped Optical OFDM with Generalized Index Modulation, ACO-OFDM-GIM)方案。每个子载波块中选择激活数目不唯一的子载波,同时引入子载波分配算法进一步提升了系统的误码性能。文中详细介绍了ACO-OFDM-GIM调制映射原理,推导了其在湍流信道下的理论误码率,并采用仿真实验进一步验证了其性能。结果表明,与ACO-OFDM、ACO-OFDM-IM等系统对比,ACO-OFDM-GIM系统的传输速率和误码性能都有明显改善。在频谱效率相同的情况下,ACO-OFDM-GIM系统在大信噪比时能够获得比ACO -OFDM和ACO-OFDM-IM系统更好的误码性能。当误码率为
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时,强湍流条件下(4,[1,2])ACO-OFDM-GIM系统的信噪比相对于(4,2)ACO-OFDM-IM和ACO-OFDM系统分别改善了约
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和
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。ACO-OFDM-GIM方案为未来大气激光通信传输速率的提高提供了一种有效手段。
Optical orthogonal frequency division multiplexing (OFDM) with index modulation has the advantage of high spectral efficiency (SE); however, the error performance is not optimal. In this paper, a scheme of asymmetrically clipped optical OFDM with generalized index modulation (ACO-OFDM-GIM) is proposed. In this scheme, the number of active subcarriers in each sub-block can be one or more, and these subcarriers extend the frequency domain modulation. Furthermore, a subcarrier allocation algorithm is adopted to eliminate the correlation between adjacent subcarriers. In this way, a better error performance may be achieved. Taking asymmetrically clipped O-OFDM-GIM (ACO-OFDM-GIM) as an example, the modulation mapping principle of O-OFDM-GIM has been introduced in detail. In addition, the asymptotic bit error probability of the ACO-OFDM-GIM scheme for the turbulence channel is derived and the correctness is verified via simulation. Furthermore, the performance of the ACO-OFDM-GIM system is compared with that of ACO-OFDM and ACO-OFDM-IM systems. The results showed that the transmission rate and the error performance of the ACO-OFDM-GIM scheme are improved compared with the ACO-OFDM-IM and ACO-OFDM schemes. When the SE is indifferent, the error performance of the proposed scheme is greater than ACO-OFDM and ACO-OFDM-IM systems at a large signal noise ratio (SNR). When the bit error rate is 1×10
-
4
, the SNR of (4,[1,2]) ACO-OFDM-GIM scheme outperforms that of (4,2) ACO-OFDM-IM and ACO-OFDM schemes nearly 2.5 dB and 4.5 dB, under a strong turbulence channel, respectively. Therefore, the ACO-OFDM-GIM scheme is expected to effectively improve the transmission rate of atmospheric laser communication in the future.
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