1. Chirp Spread Spectrum Coexistence
September 2005
doc.: IEEE /0038r0
September 2005
Chirp Spread Spectrum Coexistence
Date:
Authors:
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Kyung-Kuk Lee, Orthotron Co.
Kyung-Kuk Lee, Orthotron Co.

2. September 2005
Reference
This document that is a copy of the original document, number /0451r2
Kyung-Kuk Lee, Orthotron Co.

3. Orthotron Co., Ltd. / Hanyang Univ., Korea
September 2005
CSS-Coexistence by
Kyung-Kuk Lee / Jong-Wha Chong, Sang-Hun Yoon, Jin-Doo Jung, Sang-Dong Kim, Young-Sam Kim
Orthotron Co., Ltd. / Hanyang Univ., Korea
John Lampe, Rainer Hach, and Lars Menzer Nanotron Technologies GmbH, Germany
Kyung-Kuk Lee, Orthotron Co.

4. Table of contents Strategy Assumptions BER Results for IEEE802 Radios
September 2005
Table of contents
Strategy
Assumptions
BER Results for IEEE802 Radios
15.4a CSS interfering with 11b
15.4a CSS interfered by 11b
15.4a CSS interfering with 15.1
15.4a CSS interfered by 15.1
15.4a CSS interfering with 15.3
15.4a CSS interfered by 15.3
15.4a CSS interfering with
15.4a CSS interfered by
Kyung-Kuk Lee, Orthotron Co.

5. Strategy September 2005 Define assumptions for interfering device
TX spectral mask
TX power
Hopping probabilties (if any)
Duty cycle
Define assumptions for interfered Rx device
Packet size
RX input filter (bandwidth and shape)
BER as function of interference plus noise power
Calculate the interference power for different frequency and distance scenarios
Assume the receiver of the interfered system to receive 10 dB above its specified sensitivity
Calculate the SINR for the different frequency and distance scenarios
Calculate the resulting BER
Calculate the resulting PER
Visualize the PER for the different frequency and distance scenarios
Kyung-Kuk Lee, Orthotron Co.

6. September 2005
Assumptions
As far as not stated otherwise all assumptions made in IEEE Std Annex E are considered valid
Kyung-Kuk Lee, Orthotron Co.

7. IEEE 802 Radio BER-vs-SINR
September 2005
BER Results for IEEE802
-15
-10 -5 5 10 15 -6 -4 -3 -2 -1
IEEE 802 Radio BER-vs-SINR
SINR [dB]
Bit Error Rate
802.11b(1Mbps)
802.11b(2Mbps)
802.11b(5.5Mbps)
802.11b(11Mbps)
(22Mbps)
a(1Mbps)
a(250Kbps)
Kyung-Kuk Lee, Orthotron Co.

8. Next Steps on BER calculation
September 2005
Next Steps on BER calculation
Replace approximation based BER calculation by analytical formula
Kyung-Kuk Lee, Orthotron Co.

9. CSS interfering with 11b September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of 11b : -76 dBm
Rx Data Packet Size : Byte
Kyung-Kuk Lee, Orthotron Co.

10. September 2005
Kyung-Kuk Lee, Orthotron Co.

11. CSS interfered by 11b September 2005 Tx Power of interferer: 14 dBm
Rx Sensitivity of CSS: dBm
Rx Data Packet Size : Byte
Kyung-Kuk Lee, Orthotron Co.

12. September 2005
Kyung-Kuk Lee, Orthotron Co.

13. CSS interfering with 15.1 September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of 15.1: dBm
Rx Data Packet Size : Byte
Rx Hopping sequence: 15 inband, 54 out of band
Kyung-Kuk Lee, Orthotron Co.

14. September 2005
Kyung-Kuk Lee, Orthotron Co.

15. CSS interfered by 15.1 September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of CSS: dBm
Rx Data Packet Size : Byte
Tx Hopping sequence: 15 inband, 54 out of band
Kyung-Kuk Lee, Orthotron Co.

16. September 2005 15.1-“duty cycle“ not included!
Kyung-Kuk Lee, Orthotron Co.

17. Next steps on 15.1 Analyze how to include 15.1-“duty cycle“
September 2005
Next steps on 15.1
Analyze how to include 15.1-“duty cycle“
Kyung-Kuk Lee, Orthotron Co.

18. CSS interfering with 15.3 September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of 15.3: dBm
Rx Data Packet Size : Byte
Kyung-Kuk Lee, Orthotron Co.

19. September 2005
CSS interfering with 15.3
Kyung-Kuk Lee, Orthotron Co.

20. CSS interfered by 15.3 September 2005 Tx Power of interferer: 8 dBm
Rx Sensitivity of CSS: dBm
Rx Data Packet Size : Byte
Kyung-Kuk Lee, Orthotron Co.

21. September 2005
Kyung-Kuk Lee, Orthotron Co.

22. CSS interfering with 15.4 September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of 15.4: dBm
Rx Data Packet Size : 22 Byte
Kyung-Kuk Lee, Orthotron Co.

23. September 2005
Kyung-Kuk Lee, Orthotron Co.

24. CSS interfered by 15.4 September 2005 Tx Power of interferer: 0 dBm
Rx Sensitivity of CSS: dBm
Rx Data Packet Size : Byte
Kyung-Kuk Lee, Orthotron Co.

25. September 2005
Kyung-Kuk Lee, Orthotron Co.

26. September 2005
General next steps
Validate assumptions on spectral TX shapes and RX input filters
Kyung-Kuk Lee, Orthotron Co.