Back to Search
Start Over
Non-Data-Aided Symbol Rate Estimation for a Low Roll-Off Factor Nyquist WDM Signal
- Source :
- IEEE Photonics Journal, Vol 13, Iss 4, Pp 1-10 (2021)
- Publication Year :
- 2021
- Publisher :
- IEEE, 2021.
-
Abstract
- Nyquist signals with low roll-off factors pose a challenge for non-data-aided blind symbol rate estimation problems in long-haul applications. We adopted the nonlinear least squares (NLS) approach to estimate the symbol rate of low roll-off factor signals. This method tolerates chromatic dispersion and additive Gaussian noise. In addition, this method can operate below two samples per symbol, thus enabling low-power-consumption receivers. Simulation and experimental results show that the mean squared error is below $10^{-4}$ with only 3000 samples needed for polarization-division-multiplexed (PDM) quadrature phase-shift keying (QPSK) or quadrature amplitude modulation (QAM) systems with a roll-off factor below 0.1 for an optical signal-to-noise ratio greater than 12 dB. Compared with the maximum likelihood estimation (MLE) method, our proposed method has a more robust performance under low roll-off factor signals and in low-sampling-rate scenarios. The mean squared error remains the same for a nominal symbol rate (i.e., the ratio of the symbol rate to the sampling rate, also widely known as oversampling rate) ranging from 0.1 to 0.9.
- Subjects :
- Mean squared error
QC350-467
Optics. Light
non-data-aided
Atomic and Molecular Physics, and Optics
TA1501-1820
QAM
symbols.namesake
Signal-to-noise ratio
Gaussian noise
symbols
Oversampling
Frequency estimation
Applied optics. Photonics
Electrical and Electronic Engineering
Symbol rate
Algorithm
nonlinear least squares estimation
Quadrature amplitude modulation
Mathematics
Phase-shift keying
Subjects
Details
- Language :
- English
- ISSN :
- 19430655
- Volume :
- 13
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- IEEE Photonics Journal
- Accession number :
- edsair.doi.dedup.....41867e094628a24e3281baa42956c1b0