Decision feedback equalization
Decision Feedback Equalization (DFE) is a form of non-linear symbol-by-symbol equalization in which past decisions are used to cancel post-cursor inter-symbol interference (ISI). The main cause of ISI is when the transmitted symbol duration is comparable to the channels’ delay spread. DFE is appe...
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| Format: | Theses and Dissertations |
| Language: | English |
| Published: |
2017
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| Online Access: | http://hdl.handle.net/10356/72538 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Decision Feedback Equalization (DFE) is a form of non-linear symbol-by-symbol equalization in
which past decisions are used to cancel post-cursor inter-symbol interference (ISI). The main
cause of ISI is when the transmitted symbol duration is comparable to the channels’ delay spread.
DFE is appealing since it is easy to implement and does not enhance noise, as much as linear
equalizers do. However, wrong decisions tend to give rise to more errors; this phenomenon is
called error propagation.
This report studies the basic principle and operations of DFE. It also briefly discusses error
propagation and a few popular mitigation techniques such as constrained feedback method and
erasure slicer method. Simulation results using MATLAB are included to aid and support
discussions. It is seen that DFE performs better than the traditional linear equalizers, and error
propagation can be effectively mitigated using the mentioned techniques. |
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