1. Phase Noise Sensitivity of HRb OFDM
November 2000
Phase Noise Sensitivity of HRb OFDM
Paul Chiuchiolo and Mark Webster
Intersil Corporation
Paul Chiuchiolo and Mark Webster, Intersil

2. Non-Ideal PA Effects for OFDM
November 2000
Non-Ideal PA Effects for OFDM
PER with Phase Noise
20kHz 3dB Bandwidth
1, 2 and 4 degrees RMS
Using model in document 296r1
6.6, 13.2, 26.4 and 59.4 Mbps tested
1000 byte packets
Subcarrier Amp/Phz Estimated over Packet (non-ideal)
Assumptions
Tracking loop disabled
Paul Chiuchiolo and Mark Webster, Intersil

3. Basis of Phase Noise Model
November 2000
Basis of Phase Noise Model
F3dB
freq
freq
PLL
Trk
Resp.
VCO
dBc/Hz
-20 dB/dec
+20 dB/dec
F3dB
freq
2nd-order
PLL
Actual:
VCO
Composite
-20 dB/dec
Model:
1st-order
LPF
AWGN
F3dB
freq
freq
1st-
order
LPF
AWGN
PSD
-20 dB/dec
Paul Chiuchiolo and Mark Webster, Intersil

4. Equivalent Noise BW of 1-pole Butterworth Filter used for phase noise.
November 2000
Equivalent Noise BW of 1-pole Butterworth Filter used for phase noise. R C
Paul Chiuchiolo and Mark Webster, Intersil

5. Compute RMS Phase Noise as Function of Flat SSB Power Pssb dB
November 2000
Compute RMS Phase Noise as Function of Flat SSB Power Pssb dB
F3dB
freq
Pssb dB
Phase
Noise
-20 dB/dec
Paul Chiuchiolo and Mark Webster, Intersil

6. Phase Noise Utility: BW = 10 KHz and RMS PN = 1 degree
November 2000
Phase Noise Utility: BW = 10 KHz and RMS PN = 1 degree
Target RMS phz error (degrees): e+000
Estimated RMS phz error (deg) using samples: e+000
Paul Chiuchiolo and Mark Webster, Intersil

7. Phase Noise with 64 QAM (10 KHz loop bandwidth)
November 2000
Phase Noise with 64 QAM (10 KHz loop bandwidth)
1 degree RMS
4 degrees RMS
35.6 dB SDR
23.5 dB SDR
Paul Chiuchiolo and Mark Webster, Intersil

8. PER for 6.6 Mbps with Phase Noise
November 2000
PER for 6.6 Mbps with Phase Noise
1000 byte
Packets
Paul Chiuchiolo and Mark Webster, Intersil

9. PER for 13.2 Mbps with Phase Noise
November 2000
PER for 13.2 Mbps with Phase Noise
1000 byte
Packets
Paul Chiuchiolo and Mark Webster, Intersil

10. PER for 26.4 Mbps with Phase Noise
November 2000
PER for 26.4 Mbps with Phase Noise
1000 byte
Packets
Paul Chiuchiolo and Mark Webster, Intersil

11. PER for 59.4 Mbps with Phase Noise
November 2000
PER for 59.4 Mbps with Phase Noise
1000 byte
Packets
Paul Chiuchiolo and Mark Webster, Intersil

12. 10% PER Degradation Rate Mbps 1 deg 2 deg 4 deg
November 2000
10% PER Degradation
Rate Mbps deg deg deg
~ 0 dB ~ 0 dB dB ~ ~
Paul Chiuchiolo and Mark Webster, Intersil

13. Conclusions Phase noise performance shown
November 2000
Conclusions
Phase noise performance shown
Sub-carrier amp/phase was estimated
Phase noise tracking techniques not examined
Performance looks acceptable
Paul Chiuchiolo and Mark Webster, Intersil