1. IEEE P802.22 Wireless RANs Date: 2007-03-09
Month Year
doc.: IEEE yy/xxxxr0
March 2007
CBP Packet
IEEE P Wireless RANs Date:
Authors:
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Monisha Ghosh, Philips
John Doe, Some Company

2. Abstract The CBP PHY description is presented. March 2007 Month Year
doc.: IEEE yy/xxxxr0
March 2007
Abstract
The CBP PHY description is presented.
Monisha Ghosh, Philips
John Doe, Some Company

3. CBP Packet Format Preamble CBP Data 1 CBP Data 2 (opt.) 1 OFDM Symbol
March 2007
CBP Packet Format
Preamble
CBP Data 1
CBP Data 2 (opt.)
1 OFDM Symbol
(4 repetitions)
1 OFDM Symbol
(Data + pilots)
1 OFDM Symbol
(Data + Pilots)
Monisha Ghosh, Philips

4. CBP Preamble, Pilots, Data
March 2007
CBP Preamble, Pilots, Data
Assume 1680 data + pilot carriers. 1
840
1208
2407
Frequency bin no.
Preamble: Symbols on carriers (4,8, … ,840) and (1208,1212, … ,2044)
Pilots : Symbols on carriers (2,6, … ,838) and (1210,1214, …, 2046)
Data : Symbols on carriers ((3,4,5),(7,8,9), … ,(835,836,837))
and ((1211,1212,1213),(1215,1216,1217), … .(2043,2044,2045))
Total no. of pilots: 420
Total no. of data carriers: 1254
Monisha Ghosh, Philips

5. CBP preamble, pilots data: frequency domain
March 2007
CBP preamble, pilots data: frequency domain
Frequency bin no.
Monisha Ghosh, Philips

6. CBP Data Mapping 418 bits (~ 50 bytes)
March 2007
CBP Data Mapping
418 bits (~ 50 bytes)
Coding: Rate ½, QPSK -> 418 symbols (S1, S2 ….. S418)
No. of data carriers available: 1254 (f1, f2, …, f1254)
Each symbol is spread over 3 frequency carriers:
S1 : f1 , f419, f837
S2 : f2 , f420, f838
: : , : , :
S418 : f418, f836, f1254
Maximum Ratio Combining (MRC) is used in the receiver.
Monisha Ghosh, Philips

7. CBP Preamble Detection
March 2007
CBP Preamble Detection
Monisha Ghosh, Philips

8. Performance considerations
March 2007
Performance considerations
Robust acquisition and synchronization is enabled by the 4-times repetition in the preamble.
First 2 repetitions for acquisition and AGC setting
Next 2 repetitions are used for frequency offset estimation.
Preamble symbols are combined with the pilots and interpolation is used to obtain channel estimates.
Spreading of the data over 3 frequency bins gives additional frequency diversity.
The binary preamble sequence is generated from a 256-length M-sequence (x8 + x7 +x3 + x2 + 1 ) and has PAPR of 4.43 dB.
Monisha Ghosh, Philips