Submission doc.: IEEE 802.11- 15/0094r0 January 2015 Alecsander Eitan, Qualcomm Slide 1 SC 64QAM for NG60 Date: 2015-01-12 Authors: N am e A ffiliations A ddress Phone em ail Alecsander Eitan Qualcom m 5775 M orehouse D r, San D iego, CA 92121 +1-858-587-1121 [email protected] Am ichai Sanderovich Qualcom m 5775 M orehouse D r, San D iego, CA 92121 +1-858-587-1121 [email protected]
Submission doc.: IEEE 802.11-15/0094r0 January 2015 Alecsander Eitan, QualcommSlide 1 SC 64QAM for NG60 Date: 2015-01-12 Authors:
Dec 21, 2015
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Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 1
SC 64QAM for NG60Date: 2015-01-12
Name Affiliations Address Phone email Alecsander Eitan
Qualcomm 5775 Morehouse Dr, San Diego, CA 92121
+1-858-587-1121
Amichai Sanderovich
Qualcomm 5775 Morehouse Dr, San Diego, CA 92121
+1-858-587-1121
Authors:
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 2
Motivation and purpose
• NG60 goals are to extend the 11ad bitrate and performance• By using Channel bonding, MIMO, Higher modulation and more.
• In this presentation, we contribute to this goal by:• Addition of 64QAM to SC modulation to increase the bitrate of
links that support only single channel SC (w/o channel bonding and MIMO)
• Demonstrating the technical feasibility of achieving this goal
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 3
Benefits of 64QAM
• Increase of 50% in PHY throughput or decrease of power consumption• Increase spectral
efficiency
• Benefit in dense environment
• Simple extension of existing modem
-1.5 -1 -0.5 0 0.5 1 1.5-1.5
-1
-0.5
0
0.5
1
1.5
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 4
Modulation and Coding Scheme for SC
π/2-16QAM 4 1 13/16 5005
π/2-64QAM 6 1 5/8 5775
π/2-64QAM 6 1 3/4 6930
π/2-64QAM 6 1 13/16 7507.5
New suggested modes:
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 5
Encoding
• Use existing LDPC code rates• 64QAM with code rate ½ will not be used since it results in same
rate as 16QAM code rate ¾.
• No change in the LDPC encoding process
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 6
Mapping – straight forward extension
Use standard 64QAM
gray code mapping
- same as OFDM mapping
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 7
Performance of 64QAM code 5/8
Note: Fixed simulation not fully optimized yet
14 14.5 15 15.5 16 16.5 17 17.5 18 18.5 1910
-6
10-5
10-4
10-3
10-2
10-1
100
SNR [dB]
BE
R
Performance of 64QAM 5/8
All Float
Float, w ADCFloat, w ADC, w Max-Log
Fixed
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 8
Performance of 64QAM code 3/4
Note: Fixed simulation not fully optimized yet
14 15 16 17 18 19 2010
-6
10-5
10-4
10-3
10-2
10-1
100
SNR [dB]
BE
R
Performance of 64QAM 3/4
All Float
Float, w ADCFloat, w ADC, w Max-Log
Fixed
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 9
Performance of 64QAM code 13/16
Note: Fixed simulation not fully optimized yet
14 15 16 17 18 19 20 21 2210
-6
10-5
10-4
10-3
10-2
10-1
100
SNR [dB]
BE
R
Performance of 64QAM 13/16
All Float
Float, w ADCFloat, w ADC, w Max-Log
Fixed
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 10
SC 64QAM Rx C/N Performance
• Estimated values for the Rx Performance in AWGN(Fixed point implementation, w/o RF impairments)
Modulation Code Rate Rx C/N
64QAM5/8 18.5dB
3/4 20.0dB
13/16 21.5dB
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 11
Challenges
• Improve the data path to support higher SNR
• Increase the bit-width/processing/throughput of critical blocks: • FFT
• LDPC
• Improve RF/IF/Baseband analog blocks to support the increased SNR requirement
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 12
Mitigation methods to be considered
• Add/improve Tx pre-distortion • To combat PA saturation effect
• Use APSK (requires to be included in the standard)• To improve PAPR and PN endurance
• Requires a more complex demapper
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 13
Summary
• We suggest to add 64QAM modes to the SC modulation as part of the NG60
• Benefits: 50% throughput increase and increased spectral efficiency
• We are getting more confident that 64QAM SC is feasible
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 14
Next steps
• Continue the simulations
• Add this mode to the items that will be evaluated to next standard revision
• Evaluate higher modulations as well
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 15
Backup
Submission
doc.: IEEE 802.11-15/0094r0January 2015
Alecsander Eitan, QualcommSlide 16
SC 64QAM: Additional Improvement
• It is clear that one of the main multiplicative noise in the 60G link is the Phase Noise
• Link budget can be further increased by using better suited constellation
• Developed by DVB-S2X
8+16+20+20APSK
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