改進(jìn)的T-PPM編碼在大氣弱湍流下的性能分析
發(fā)布時(shí)間：2019-05-08 04:42
【摘要】：網(wǎng)格編碼調(diào)制(TCM)與脈沖幅度調(diào)制(PPM)相結(jié)合的T-PPM編碼具備了雙方在糾錯(cuò)能力和發(fā)射功率效率方面的優(yōu)點(diǎn),在空間光通信中有廣闊的應(yīng)用前景。而傳統(tǒng)的T-PPM編碼調(diào)制技術(shù)在映射方面存在缺陷,制約了系統(tǒng)的可靠性。為改善大氣湍流光通信系統(tǒng)的誤碼性能,提出一種適用于單載波弱湍流空間光信道的改進(jìn)型T-PPM技術(shù)。這種方法采用格雷映射取代傳統(tǒng)TCM中的"子集劃分"映射,降低接收時(shí)的誤判可能性。仿真結(jié)果表明,格雷碼映射能顯著改善誤碼性能;在誤碼率為10-3處,格雷碼映射相比子集映射提高了約0.2 dB增益,有效改善系統(tǒng)的差錯(cuò)性能;在1 ps和2 ps展寬量條件下誤碼率(BER)分別減少至傳統(tǒng)方案的約1/2和4/5,從而驗(yàn)證了格雷碼映射的優(yōu)越性。
[Abstract]:The combination of trellis coded modulation (TCM) and pulse amplitude modulation (PPM) T-PPM coding has the advantages of both sides in error correction capability and transmission power efficiency, and has a broad application prospect in space optical communication. However, the traditional T-PPM coding and modulation technology has some shortcomings in mapping, which restricts the reliability of the system. In order to improve the error performance of atmospheric turbulent optical communication system, an improved T-PPM technique is proposed, which is suitable for single carrier weak turbulent spatial optical channels. In this method, Gray map is used to replace the "subset partition" mapping in traditional TCM, which reduces the possibility of misjudgment when receiving. The simulation results show that the lattice code mapping can significantly improve the error performance, and at the bit error rate of 10 ~ 3, the lattice code mapping improves the gain of about 0.2 dB compared with the subset mapping, and the error performance of the system is improved effectively. Under the condition of 1 ps and 2 ps BER, the bit error rate (BER) is reduced to about 1 ~ 2 and 4 ~ 5 of the traditional scheme, respectively, which proves the superiority of Gray code mapping.
【作者單位】： 中國(guó)海洋石油總公司;
【分類號(hào)】：TN929.12
，
本文編號(hào)：2471628
[Abstract]:The combination of trellis coded modulation (TCM) and pulse amplitude modulation (PPM) T-PPM coding has the advantages of both sides in error correction capability and transmission power efficiency, and has a broad application prospect in space optical communication. However, the traditional T-PPM coding and modulation technology has some shortcomings in mapping, which restricts the reliability of the system. In order to improve the error performance of atmospheric turbulent optical communication system, an improved T-PPM technique is proposed, which is suitable for single carrier weak turbulent spatial optical channels. In this method, Gray map is used to replace the "subset partition" mapping in traditional TCM, which reduces the possibility of misjudgment when receiving. The simulation results show that the lattice code mapping can significantly improve the error performance, and at the bit error rate of 10 ~ 3, the lattice code mapping improves the gain of about 0.2 dB compared with the subset mapping, and the error performance of the system is improved effectively. Under the condition of 1 ps and 2 ps BER, the bit error rate (BER) is reduced to about 1 ~ 2 and 4 ~ 5 of the traditional scheme, respectively, which proves the superiority of Gray code mapping.
【作者單位】： 中國(guó)海洋石油總公司;
【分類號(hào)】：TN929.12
，
本文編號(hào)：2471628
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