Post Equalizer SNR Estimation in TDD Operation
Learn about the importance of Post Equalizer SNR estimation in TDD operation for maintaining signal quality. Explore the use of Hard-Decision EVM method and its correlation with LDPC statistics in this informative presentation.
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March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post equalizer SNR estimation Date: 2018-March-5 Authors: Name Company Address Phone Email Alecsander Eitan Qualcomm eitana@qti.qualcomm.com Assaf Kasher Qualcomm akasher@qti.qualcomm.com Michael Grigat Deutsche Telekom m.grigat@telekom.de Submission Slide 1 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Introduction TDD operation requires to have a Link Maintenance feature, which includes various parameters regarding the quality of the received signal at the receiver side. Some of these parameters are Post Equalizer SNR and LDPC statistics. This presentation presents the expected behavior of Hard- Decision EVM as a candidate for Post Equalizer SNR estimation and the correlation to LDPC statistics. Submission Slide 2 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay What is Hard-Decision EVM ? Estimation of the Post Equalizer SNR is very simple given that the transmitted symbols are known. Hard-Decision EVM is one of the most simplest methods to estimate the Post Equalizer SNR. The estimation can be done as part of the de-mapping process. Post Equalizer SNR based on re-encoded symbols are more accurate (if the LDPC was successfully decoded) but is more complex and expensive. Post Equalizer SNR and Hard-Decision EVM are supporting a very wide range of SNR values. Hard-Decision EVM requires some correction function to reduce the bias. Submission Slide 3 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based Submission 4 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Simulation DMG SC MCS: 10,11,12,12.1 (16QAM) Per each SNR: 100 frames, 20 FDE blocks Fixed point with analog impairments AWGN channel Vertical bars present 5 and 95 percentiles HD based Post Equalizer SNR correction function not included Submission Slide 5 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based Submission 6 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based Submission 7 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based Submission 8 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based QPSK Submission 9 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR - True and HD based QPSK Submission 10 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR and LDPC average iterations Submission 11 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Post Equalizer SNR and LDPC average iterations Submission 12 Alecsander Eitan (Qualcomm)
March 2018 doc.: IEEE 802.11-18/0402-00-00ay Conclusion The HD based Post Equalizer EVM is a good approximation method for the Post Equalizer EVM. Low variability Wide dynamic range Saturation effect at low SNR to be compensated by correction function Saturation effect at high SNR caused by quantization Compensation per modulation is required Submission Slide 13 Alecsander Eitan (Qualcomm)
