1. [Simulation Results to Determine the Normalized C/N in TPC Equation]
March 2007
doc.: IEEE
June 2008
[Simulation Results to Determine the Normalized C/N in TPC Equation]
IEEE P Wireless RANs Date:
Authors:
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Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

2. March 2007
doc.: IEEE
June 2008
Abstract
This presentation is to propose the Normalized C/N which is used in TPC (Transmit Power Control) for UIUC values 2 ~ 7. We have discussed the issues on the TPC simulations since the January This presentation is the final results including as follows,
Simulation configurations
Updates of ETRI’s simulator
Simulation results
Comparisons of normalized C/N in AWGN channel and WRAN channel
Conclusions
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

3. Simulation Configurations
March 2007
doc.: IEEE
June 2008
Simulation Configurations
Representative of WRAN channel: profile B
Rayleigh fading:
Constant amplitude and phase within a frame
Constant amplitude, variable phase between a frame
FEC: convolutional coding
FEC block size:
Determined by concatenation rule
Burst size (n):
1800 Bytes (QPSK), 3600 Bytes (16QAM), 5400 Bytes (64QAM)
Occupy at least 6 OFDM symbols for different modulation and code rate
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

4. Updates of ETRI’s Simulator
March 2007
doc.: IEEE
June 2008
Updates of ETRI’s Simulator
Subcarrier and bit interleaver
The subcarrier and bit interleaver are changed to FranceTelecom’s schemes from 16’s schemes
Concatenation rule
The block size is different depending the modulation and FEC rate
Modification of Rayleigh fading simulator
Similar to DVB-T channel environments
Constant amplitude and random phase between a frame
Data to burst mapping
Downstream data is allocated using linear-vertical scheme
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

5. UIUC Values Where Eq. 186 Is Used
March 2007
doc.: IEEE
June 2008
UIUC Values Where Eq. 186 Is Used
Seperate TPC Operation
In general, the BS may change the CPE Tx Power through power correction messages, such as US-MAP Power Control IE or CPE-FPC.
Eq. 186 is used in situations where the CPE should automatically update its Tx power without being explicitly instructed by the BS.
Equation 186:
UIUC values where Eq. 186 is used
UIUC=2 & 3: UCS Notification & BW Request
UIUC=4, 5, & 6: CDMA UCS Notification, CDMA BW Request, & CDMA Ranging
UIUC=7: CDMA Allocation IE
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

6. Reference Performance for Normalized C/N
March 2007
doc.: IEEE
June 2008
Reference Performance for Normalized C/N
Reference performance for UIUC=2, 3, and 7
BER=2*10-4 after the Viterbi decoder
Because it is related to the contention-based messages and CDMA allocation message, not data transmission, thus it is not necessary to follow the QoS for data.
Reference performance for UIUC=4 ~ 6
90% CDMA code detection probability
Because it is related to the CDMA-based ranging, BW request, and UCS notification, thus it is reasonable to use the code detection probability.
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

7. Coded BER in AWGN (1) June 2008 March 2007
doc.: IEEE
June 2008
Coded BER in AWGN (1)
Reference
BER
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

8. Coded BER in AWGN (2) June 2008 March 2007
doc.: IEEE
June 2008
Coded BER in AWGN (2)
Reference
BER
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

9. Coded BER in WRAN-B (1) June 2008 March 2007
doc.: IEEE
June 2008
Coded BER in WRAN-B (1)
Reference
BER
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

10. Coded BER in WRAN-B (2) June 2008 March 2007
doc.: IEEE
June 2008
Coded BER in WRAN-B (2)
Reference
BER
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

11. CDMA Code Detection Probability in AWGN
March 2007
doc.: IEEE
June 2008
CDMA Code Detection Probability in AWGN
Reference
Detection
Probability
SNR=1.2dB
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

12. CDMA Code Detection Probability in WRAN-B
March 2007
doc.: IEEE
June 2008
CDMA Code Detection Probability in WRAN-B
Reference
Detection
Probability
SNR=5dB
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

13. Comparisons of Normalized C/N
March 2007
doc.: IEEE
June 2008
Comparisons of Normalized C/N
Modulation and
FEC rate
Fast feedback IE
CDMA code
QPSK - 1/2
QPSK - 2/3
QPSK - 3/4
QPSK - 5/6
16QAM - 1/2
16QAM - 2/3
16QAM – 3/4
16QAM – 5/6
64QAM – 1/2
64QAM - 2/3
64QAM - 3/4
64QAM – 5/6
Normalized C/N
(802.16e, Ped-B1)) 3 6
7.5 9 NA 12
14.5 15
17.5 18 20 21 23
Normalized C/N
(DVB-T, AWGN) NA
4.6
6.4
7.4
10.6
12.7
14.0
15.4
18.3
19.9
Normalized C/N
(ETRI, AWGN) -
1.2
=4.3
=6.1
=7.1
=8.1
=10.2
=12.4
=13.5
=14.8
=15.6
=18.3
=19.7
=20.9
Normalized C/N
(DVB-T, P12)) NA
7.5
11.5
15.3
13.8
17.7
21.5
18.9
23.4
27.5
Normalized C/N
(ETRI, WRAN-B) - 5
=8.1
10+1.6=11.6
=14.0
=17.8
13+1.8=14.8
=20.3
=24.6
=28.6
=20.5
=26.2
=31.8
=40.4
6dB
6.7dB
7dB
8.7dB
6dB
10.6dB
10.8dB
6dB
5.7dB
5.5dB
5.9dB
6dB
6dB
5.5dB
11.8dB
1) To be confirmed, 2) P1: DVB-T Rayleigh channel
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

14. C/N Differences for Different Modulation and FEC Rate
March 2007
doc.: IEEE
June 2008
C/N Differences for Different Modulation and FEC Rate
The new Tx Power is proportional to the C/N differences as follows:
From the Table-Comparisons of Normalized C/N, the C/N difference to the next PHY mode is
For e case, it is ~ 1.75 dB
For case, it is ~ dB
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

15. March 2007
doc.: IEEE
June 2008
Conclusions
We suggest the Normalized C/N value of TPC equation from simulation results.
The C/N difference to the next PHY mode is ranged from dB to 2.95 dB (in case of e, ~ 1.75 dB)
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

16. June 2008
Backup Slides
Chang-Joo Kim, ETRI

17. EICTA MBRAI 2.0 for Reference
March 2007
doc.: IEEE
June 2008
EICTA MBRAI 2.0 for Reference
It is Mobile and Portable DVB-T/H Radio Access Interface Specification
There is a meaning in that the center frequency and bandwidth are identical with WRAN system
C/N performances for various channel
Gaussian channel
DVB-T Rayleigh channel (P1)
Portable indoor and outdoor channel (PI and PO)
Mobile channel (TU6)
Reference BER=2*10-4 after the Viterbi decoder
This BER corresponds to the DVB-T standard defined quasi error free (QEF)
QEF means “less than one uncorrelated error event per hour”, corresponding to BER=10-11 after the RS decoder
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

18. DVB-T C/N (dB) in AWGN Channel
March 2007
doc.: IEEE
June 2008
DVB-T C/N (dB) in AWGN Channel
The C/N values are calculated using the theoretical C/N figures added by an implementation margin as follows,
1.1 dB for QPSK
1.3 dB for 16QAM
1.5 dB for 64QAM
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

19. DVB-T C/N (dB) in Terrestrial Channel
March 2007
doc.: IEEE
June 2008
DVB-T C/N (dB) in Terrestrial Channel
DVB-T Specified Terrestrial Channel
The channel does not include any Doppler, i.e. it is a snapshot of a real time variant Rayleigh channel
Implementation Margin
1.6 dB for QPSK
1.8 dB for 16QAM
2.0 dB for 64QAM
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI

20. March 2007
doc.: IEEE
June 2008
References
EICTA MBARI 2.0, Mobile and portable DVB-T/H Radio Access – Part 1: Interface specification, June 2007.
ETSI EN , Digital video broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television, v1.5.1, June 2004.
Chang-Joo Kim, ETRI
Chang-Joo Kim, ETRI