首页|The performances of singularity-avoidance CMA equalizers in real-time system*
The performances of singularity-avoidance CMA equalizers in real-time system*
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NSTL
Elsevier
In this paper, we compare the performances of conventional CMA, two-stage CMA and constrained CMA, from cases of fixed-point, parallelization and delay periods which are necessary in real-time system. We implement an 112Gbit/s dual polarization channel model to simulate conventional CMA and other modified CMAs. When OSNR (Optical Signal to Noise Ratio) and PDL do not vary, compared with float-point case, reducing bit width of input data can worsen singularity problem of these three equalizers. Besides, when OSNR and PDL do not vary, compared with serial case, increasing parallels number can reduce singularity probabilities of these three equalizers. Then, when PDL does not change, increasing delay periods can deteriorate singularity problem. Furthermore, in float-point case, fixed-point case, serial case, parallels case and delay periods case, compared with other two equalizers, constrained CMA all shows best performances to decrease singularity probabilities. Therefore, among these three equalizers, constrained CMA is the most suitable to be employed in real-time system.
Real-timeSingularity-avoidance CMADSPFixed-pointParallelizationCONSTANT-MODULUS ALGORITHMSTOKES SPACE
NSTL
Elsevier
