digital modulation - mikrotikmum.mikrotik.com/presentations/za13/hannes.pdf · better modulation...
TRANSCRIPT
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DIGITAL MODULATION
MUM - South Africa - July 2013
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Presented by: Hannes Willemse
Miro Training Consultant
NHD Electronics (TUT)
Mikrotik: MTCNA, MTCWE Radwin: Certified Trainer
Ubiquiti: UAC Certified Trainer Vivotek: VEC Certified Trainer
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The challenge:
How do we get information through the air from one point
to another point?
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Solution Electro Magnetism
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The challenge Distance
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Solution
The same electromagnetic waves but in the Radio Frequency spectrum
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Next Challenge
To trasmit data over the link
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Analog Data
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Digital Data
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Digital Data
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Next Challenge Throughput
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Throughput
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Solution Better Modulation
Combination of some of the previous modulations
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Quadrature Amplitude Modulation
4 QAM
64 QAM
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Challenge Linear amplification
Noise
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Solution - OFDM Orthogonal Frequency Division Multiplexing
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802.11
802.11 Modula-on Coding Req Link SNR Max Tp Min Sig MCS 0 BPSK 1/2 9.3 dB 15 Mbps -‐88 dBm MCS 1 QPSK 1/2 11.3 dB 30 Mbps -‐82 dBm MCS 2 QPSK 3/4 13.3 dB 45 Mbps -‐79 dBm MCS 3 16 QAM 1/2 17.3 dB 60 Mbps -‐76 dBm MCS 4 16 QAM 3/4 21.3 dB 90 Mbps -‐73 dBm MCS 5 64 QAM 2/3 24.3 dB 120 Mbps -‐68 dBm MCS 6 64 QAM 3/4 26.3 dB 135 Mbps -‐65 dBm MCS 7 64 QAM 5/6 27.3 dB 150 Mbps -‐63 dBm MCS 8 BPSK 1/2 12.3 dB 30 Mbps -‐85 dBm MCS 9 QPSK 1/2 14.3 dB 60 Mbps -‐79 dBm MCS 10 QPSK 3/4 16.3 dB 90 Mbps -‐76 dBm MCS 11 16 QAM 1/2 20.3 dB 120 Mbps -‐73 dBm MCS 12 16 QAM 3/4 24.3 dB 180 Mbps -‐70 dBm MCS 13 64 QAM 2/3 27.3 dB 240 Mbps -‐65 dBm MCS 14 64 QAM 3/4 29.3 dB 270 Mbps -‐62 dBm MCS 15 64 QAM 5/6 30.3 dB 300 Mbps -‐60 dBm
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MikroTik
Auto Data Rate
Data rate is decreased upon failure and frame is sent again.
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Weakest Link
802.11 Keep on trying until frame go
through. NV2
Still busy trying and adjusting then time slot is over
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Weakest Link
802.11 Good for weakest link bad for
network NV2
Good for network bad for weakest link
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Weakest Link
Set Data Rate manual to lowest level with least retries.
Increase antenna gain.
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802.11 Modula-on Coding Req Link SNR Max Tp Min Sig MCS 0 BPSK 1/2 9.3 dB 15 Mbps -‐88 dBm MCS 1 QPSK 1/2 11.3 dB 30 Mbps -‐82 dBm MCS 2 QPSK 3/4 13.3 dB 45 Mbps -‐79 dBm MCS 3 16 QAM 1/2 17.3 dB 60 Mbps -‐76 dBm MCS 4 16 QAM 3/4 21.3 dB 90 Mbps -‐73 dBm MCS 5 64 QAM 2/3 24.3 dB 120 Mbps -‐68 dBm MCS 6 64 QAM 3/4 26.3 dB 135 Mbps -‐65 dBm MCS 7 64 QAM 5/6 27.3 dB 150 Mbps -‐63 dBm MCS 8 BPSK 1/2 12.3 dB 30 Mbps -‐85 dBm MCS 9 QPSK 1/2 14.3 dB 60 Mbps -‐79 dBm MCS 10 QPSK 3/4 16.3 dB 90 Mbps -‐76 dBm MCS 11 16 QAM 1/2 20.3 dB 120 Mbps -‐73 dBm MCS 12 16 QAM 3/4 24.3 dB 180 Mbps -‐70 dBm MCS 13 64 QAM 2/3 27.3 dB 240 Mbps -‐65 dBm MCS 14 64 QAM 3/4 29.3 dB 270 Mbps -‐62 dBm
MCS 15 64 QAM 5/6 30.3 dB 300 Mbps -‐60 dBm
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Thank you for your time. Q & A
Would like to invite you all to Miro’s IP Convergence Conferences in Jhb, Cpt,
Dbn and Nelspruit for free training sessions covering MikroTik and other
technologies.
www.ip-con.co.za