Performance improvement of coherent free-space optical communication with quadrature phase-shift keying modulation using digital phase estimation.

The performance of coherent free-space optical (CFSO) communication with phase modulation is limited by both phase fluctuations and intensity scintillations induced by atmospheric turbulence. To improve the system performance, one effective way is to use digital phase estimation. In this paper, a CFSO communication system with quadrature phase-shift keying modulation is studied. With consideration of the effects of log-normal amplitude fluctuations and Gauss phase fluctuations, a two-stage Mth power carrier phase estimation (CPE) scheme is proposed. The simulation results show that the phase noise can be suppressed greatly by this scheme, and the system symbol error rate performance with the two-stage Mth power CPE can be three orders lower than that of the single-stage Mth power CPE. Therefore, the two-stage CPE we proposed can contribute to the performance improvements of the CFSO communication system and has determinate guidance sense to its actual application.

[1]  Guifang Li,et al.  BER estimation of QPSK homodyne detection with carrier phase estimation using digital signal processing. , 2006, Optics express.

[2]  K. Kikuchi,et al.  Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing , 2006, IEEE Photonics Technology Letters.

[3]  Jonathan F. Holzman,et al.  Performance analysis of coherent wireless optical communications with atmospheric turbulence. , 2012, Optics express.

[4]  Joseph M. Kahn,et al.  Capacity of coherent free-space optical links using diversity-combining techniques. , 2009 .

[5]  Xiang Zhou,et al.  An Improved Feed-Forward Carrier Recovery Algorithm for Coherent Receivers With $M$ -QAM Modulation Format , 2010, IEEE Photonics Technology Letters.

[6]  Yuefeng Ji,et al.  A Simplified Feedforward Carrier Recovery Algorithm for Coherent Optical QAM System , 2011, Journal of Lightwave Technology.

[7]  Aniceto Belmonte,et al.  Performance of synchronous optical receivers using atmospheric compensation techniques. , 2008, Optics express.

[8]  M. Winter,et al.  Error Vector Magnitude as a Performance Measure for Advanced Modulation Formats , 2012, IEEE Photonics Technology Letters.

[9]  Andrew J. Viterbi,et al.  Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission , 1983, IEEE Trans. Inf. Theory.

[10]  R. Noll.  Zernike polynomials and atmospheric turbulence , 1976 .

[11]  K. Kikuchi,et al.  Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation , 2006, Journal of Lightwave Technology.

[12]  Irshaad Fatadin,et al.  Differential carrier phase recovery for QPSK optical coherent systems with integrated tunable lasers. , 2013, Optics express.

[13]  Wei Li,et al.  Carrier Phase Estimation Based on Error Function Calculation for 16-QAM Systems , 2016, IEEE Photonics Technology Letters.

[14]  Ming Li,et al.  Coherent free space optics communications over the maritime atmosphere with use of adaptive optics for beam wavefront correction. , 2015, Applied optics.

[15]  D. L. Fried,et al.  Optical heterodyne detection of an atmospherically distorted signal wave front , 1967 .

[16]  Aniceto Belmonte,et al.  Capacity of coherent free-space optical links using atmospheric compensation techniques. , 2009, Optics express.

[17]  Kamran Kiasaleh,et al.  Performance of coherent DPSK free-space optical communication systems in K-distributed turbulence , 2006, IEEE Transactions on Communications.

[18]  R. Noe,et al.  Hardware-Efficient Coherent Digital Receiver Concept With Feedforward Carrier Recovery for $M$ -QAM Constellations , 2009, Journal of Lightwave Technology.

[19]  T Pfau,et al.  Phase-Noise-Tolerant Two-Stage Carrier Recovery Concept for Higher Order QAM Formats , 2010, IEEE Journal of Selected Topics in Quantum Electronics.

[20]  Chan-Byoung Chae,et al.  Performance Analysis of Coherent Free-Space Optical Systems With Multiple Receivers , 2015, IEEE Photonics Technology Letters.

[21]  N. Perlot,et al.  Turbulence-induced fading probability in coherent optical communication through the atmosphere. , 2007, Applied optics.

[22]  S M Aghajanzadeh,et al.  Diversity–Multiplexing Trade-Off in Coherent Free-Space Optical Systems With Multiple Receivers , 2010, IEEE/OSA Journal of Optical Communications and Networking.

[23]  J. Kahn,et al.  Carrier synchronization for 3- and 4-bit-per-symbol optical transmission , 2005, Journal of Lightwave Technology.