Performance analysis of blind timing phase estimators for digital coherent receivers
Optics Express
|March 26, 2014
Summary
This study analyzes blind timing phase estimators (TPE) for digital receivers, revealing algorithm equivalences and proposing new methods for Nyquist signals. Sampling diversity gains were investigated and verified through simulations and experiments.
Area of Science:
- Digital Communications
- Signal Processing
- Receiver Design
Background:
- Digital coherent receivers require accurate timing phase estimation for optimal performance.
- Existing blind timing phase estimators (TPE) have varying efficiencies and complexities.
- Analysis of TPE performance under different signal and receiver parameters is crucial.
Purpose of the Study:
- To analyze the performance of various blind timing phase estimators (TPE) for digital coherent receivers.
- To establish analytical equivalences between different TPE algorithms.
- To propose novel TPE algorithms for Nyquist signals and investigate sampling diversity effects.
Main Methods:
- Analytical derivation of TPE algorithm equivalences.
- Development of new TPE algorithms based on identified equivalences.
- Investigation of TPE performance impacted by receiver bandwidth, spectrum weighting, and timing phase.
- Definition and analysis of sampling diversity gain for multiple pulse shapes.
Main Results:
- Equivalence demonstrated between four TPE algorithms, with two squaring pre-filter algorithms identified as identical.
- Three new TPE algorithms suitable for Nyquist signals were proposed.
- Impact of receiver and spectrum weighting bandwidths, and signal timing phase on TPE performance was quantified.
- Sampling diversity gain was analyzed for four pulse shapes and its effect verified experimentally and via simulation.
Conclusions:
- The study provides a unified understanding of TPE algorithm performance.
- Novel TPE algorithms offer improved applicability to Nyquist signals.
- Understanding sampling diversity is key to enhancing TPE performance in digital receivers.
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