Re: [802.3_EPOC] Unapproved minutes from 11/1 Channel Model Ad Hoc call
Duane,
This is to complete my action item to distribute my email on so-called "OFDM Numerology". It is only peripherally related to the numerology however.
I did make some modification based on the discussions in the WG since I sent this out. Also, the examples for the parameter limits are just that, examples, and are in no way intended to be considered proposals for impairment levels (which will instead come from the MSO input). I included them only because I thought they might provide clarity on what the parameters mean.
Hal
Channel Parameter (Impairment)
Example Downstream
Example Upstream
Associated Mitigating OFDM Parameters
MER or SNR
35dB
25dB
QAM Level (QPSK to 1024-QAM), FEC Level
Phase Noise
Variance <0.02
Variance <0.04
Subcarrier Bandwidth, Carrier Tracking Loop bandwidth
Microreflections
-20 dBc @ <= 1.5 μsec, -30 dBc @ > 1.5 μsec -10 dBc @ <= 0.5
μsec, -15 dBc @ <= 1.0 μsec
-10 dBc @ <= 0.5 μsec -20 dBc @ <= 1.0 μsec -30 dBc @ > 1.0
μsec
Cyclic Prefix duration, Subcarrier Bandwidth
Group Delay Ripple
<75ns/6MHz
<200ns/MHz
Cyclic Prefix duration, Subcarrier Bandwidth
Impulse Noise
Not longer than 25 μsec at a 10 Hz average rate at an amplitude of 0dB/1MHz OFDM
Not longer than 10 μsec at a 1 kHz average rate for most cases
FEC Overhead, Interleaver?
Sub-Carrier to Discrete Interference
Wavelets vs OFDM vs Shaped OFDM, Subcarrier Bandwidth and should different subcarriers have different QAM?
Percent S-Cs with SIR < 0dBc >5dBc
a%
d%
"
Percent S-Cs with SIR < 5dBc >10dBc
b%
e%
"
Percent S-Cs with SIR < 10dBc >15dBc
c%
f%
"
Percent......Etc.
"
"
"
Carrier Offset
(Probably no need for this as HFC does not have a carrier offset mechanism)
(Probably no need for this as HFC does not have a carrier offset mechanism)
Frequency Synchronization and Tracking Loops
Amplitude Ripple
<0.5dB/MHz
<0.5dB/MHz
Should subcarriers have different QAM?
Maximum Amplitude Variation over Time
<1dB/sec
<1dB/sec
Amplitude Tracking Loop Bandwidth
Non Linear Amplifier - Output Backoff (OBO)
2dB
4dB
QAM Level (QPSK to 1024-QAM) and should different subcarriers have different QAM?
From: Duane Remein [mailto:Duane.Remein@xxxxxxxxxx]
Sent: Thursday, November 01, 2012 5:22 PM
To: STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
Subject: [802.3_EPOC] Unapproved minutes from 11/1 Channel Model Ad Hoc call
Please find minutes attached, please let me know if any corrections.
Mark,
Please post.
Best Regards,
Duane
FutureWei Technologies Inc.
duane.remein@xxxxxxxxxx<mailto:duane.remein@xxxxxxxxxx>
Director, Access R&D
919 418 4741
Raleigh, NC
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