基于8PSK和16PSK调制的全双工RoF系统研究
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摘要
误码率(bit error rate, BER)是信号传输质量的重要衡量指标,为了对比分析8进制相移键控(eight hexadecimal phase shift keying, 8PSK)与16进制相移键控(sixteen hexadecimal phase shift keying, 16PSK)信号的传输性能,建立了一个全双工光载无线通信(radio over fiber, RoF)链路模型。系统的下行链路是对基于马赫增德尔调制器(Maher-Zehnder modulator, MZM)的抑制奇次边带两路信号,分别进行8PSK和16PSK调制。上行链路是取下行链路中一路未被调制的抑制奇次边带信号,作为上行基带信号的载波信号,节约系统的成本。该系统分别在不同的光信噪比(optical signal to noise ratio, OSNR)和不同传输距离条件下,仿真分析了下行链路两种调制信号的光谱图及误码率曲线,通过分析接收信号的星座图和误码特性证明:与16PSK信号相比,当OSNR> 25时, 8PSK信号误码率量级可以达到10-4(lg BER-3),当传输距离为40 km时, 8PSK的误码率为4.8×10-3(lg BER=-2.32),仍然可以有效传输数据信息。且在不同OSNR和不同传输距离条件下, 8PSK的误码率均低于16PSK,因此8PSK具有更可靠的传输性能,且更适用于远距离传输。
The bit error rate(BER) is an important measure of signal transmission quality. In order to study and analyze the transmission performance of eight hexadecimal phase shift keying(8PSK) and sixteen hexadecimal phase shift keying(16PSK) signals, a full-duplex radio over fiber(RoF) link model is built in this paper. For the down link, the RoF system with suppression of even order sidebands based on Maher-Zehnder modulator(MZM) is proposed and uses 8PSK and 16 PSK to modulate.In the meanwhile, a sideband of downlink is employed as the carrier of uplink baseband signal to save the cost of the system. Under different optical signal to noise ratio(OSNR)and different transmission distances conditions, the spectrum diagram and error rate curves are obtained. By analyzing the constellation and error characteristics of the received signal, it is proved that compared with 16 PSK, when the OSNR is greater than 25, the 8PSK signal BER can reach 10-4(lg BER-3). When the transmission distance is 40 km, the 8PSK BER is 4.8×10-3(lg BER =-2.32),data information can still be transmitted efficiently. And under different OSNR and different transmission distances, the BER of 8PSK is lower than 16 PSK, so 8PSK has more reliable transmission performance and is more suitable for long-distance transmission.
The bit error rate(BER) is an important measure of signal transmission quality. In order to study and analyze the transmission performance of eight hexadecimal phase shift keying(8PSK) and sixteen hexadecimal phase shift keying(16PSK) signals, a full-duplex radio over fiber(RoF) link model is built in this paper. For the down link, the RoF system with suppression of even order sidebands based on Maher-Zehnder modulator(MZM) is proposed and uses 8PSK and 16 PSK to modulate.In the meanwhile, a sideband of downlink is employed as the carrier of uplink baseband signal to save the cost of the system. Under different optical signal to noise ratio(OSNR)and different transmission distances conditions, the spectrum diagram and error rate curves are obtained. By analyzing the constellation and error characteristics of the received signal, it is proved that compared with 16 PSK, when the OSNR is greater than 25, the 8PSK signal BER can reach 10-4(lg BER-3). When the transmission distance is 40 km, the 8PSK BER is 4.8×10-3(lg BER =-2.32),data information can still be transmitted efficiently. And under different OSNR and different transmission distances, the BER of 8PSK is lower than 16 PSK, so 8PSK has more reliable transmission performance and is more suitable for long-distance transmission.
引文
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[13] LIU A L, YIN H X, WU B. High-efficient full-duplex WDM-RoF system with sub-central station[J]. Optics Communications, 2018, 414:72-76.
[14] SILVA N A, PINTO A N. Role of amplifiers gain on the achievable information rate of M-ary PSK and QAM constellations[J]. Optics Communications, 2017, 383:215-222.
[15] KIM H S, PHAM T T, WON Y Y, et al. Simultaneous wired and wireless 1.25 Gb/s bidirectional WDM-RoF transmis-sion using multiple optical carrier suppression in FP LD[J]. Journal of Lightwave Technology, 2009, 27(14):2744-2750.
[2]姚小莉,秦会斌.基于Matlab的MPSK通信系统的仿真研究[J].物联网技术, 2017, 7(6):25-26.
[3]张馨月,武保剑,耿勇,等.基于相敏放大的MPSK信号再生性能研究[J].光电子·激光, 2017(8):836-842.
[4]张建明,娄淑琴,曾璐璐.全双工光载无线通信链路模型研究[J].红外与激光工程, 2015, 44(5):1598-1604.
[5]邵宇丰,李佳,程黎黎,等.四种级联差分相位调制码的100 Gbit/s传输[J].中国激光, 2009, 36(3):574-580.
[6]章伟飞. RoF系统60 GHz毫米波产生方法的研究[J].现代企业教育, 2010(10):116-117.
[7]陈丹,柯熙政,张拓,等.基于16PSK调制的副载波无线光通信实验研究[J].中国激光, 2015, 42(1):197-204.
[8]张肇敏.高速相干光通信系统中高频谱效率调制及信号损伤恢复算法的研究[D].北京:北京邮电大学, 2015.
[9]冯天雨,杨家玮. 8PSK调制解调技术实现的研究[J].重庆邮电学院学报(自然科学版), 2005, 17(4):440-443.
[10] LU J H, LETAIEF, K B, et al. M-PSK and M-QAM BER computation using signal-space concepts[J]. Communications IEEE Transactions on, 1999, 47(2):181-184.
[11] ZHU D, MATHEWS V J, DETIENNE D H. A likelihoodbased algorithm for blind identification of QAM and PSK signals[J]. IEEE Transactions on Wireless Communications, 2018, 17(5):3417-3430.
[12] GUNTURKUN U. Exploiting the fast spectral roll–off of CPM side–lobes to improve bandwidth efficiency in satellite communications[J]. IEEE Communications Letters,2017, 21(7):1461-1464.
[13] LIU A L, YIN H X, WU B. High-efficient full-duplex WDM-RoF system with sub-central station[J]. Optics Communications, 2018, 414:72-76.
[14] SILVA N A, PINTO A N. Role of amplifiers gain on the achievable information rate of M-ary PSK and QAM constellations[J]. Optics Communications, 2017, 383:215-222.
[15] KIM H S, PHAM T T, WON Y Y, et al. Simultaneous wired and wireless 1.25 Gb/s bidirectional WDM-RoF transmis-sion using multiple optical carrier suppression in FP LD[J]. Journal of Lightwave Technology, 2009, 27(14):2744-2750.