1. Complex Beacon Pros and Cons
Month Year
doc.: IEEE yy/xxxxr0
January 2007
Complex Beacon Pros and Cons
IEEE P Wireless RANs Date:
Authors:
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David Mazzarese, Samsung
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
January 2007
Abstract
Summary of pros and cons presented in _Samsung_Beacon_Simulations.ppt
Complete proposal on dual channel beacon with DQPSK complex spreading, supported by simulations in AWGN, Rayleigh fading, multipath channel with profile A, and beacon-to-beacon interference.
David Mazzarese, Samsung
John Doe, Some Company

3. January 2007 Month Year doc.: IEEE 802.22-yy/xxxxr0
Complex modulation with parallel sync burst and payload
TG1 Draft
Frame structure
Transmit the sync burst and the payload in parallel (future proof)
Transmit the sync burst and the payload in sequence
Modulation
DQPSK with complex spreading
DBPSK with real spreading
Other PHY parameters
Same sync burst and PSDU bitmap, chip rate and spreading factor
Same sync burst and PSDU durations (same short and long quiet periods)
Complexity
Beacon: DQPSK encoder
WRAN: DQPSK decoder
Beacon: DBPSK encoder
WRAN: DBPSK decoder
Sync burst detection rate
Sync burst can be detected at any time
No sync burst when sending PSDU
PER vs. Es/No
4.5 dB loss vs. DBPSK at 1% PER
… down to ~ 1.5 dB when considering increased detection rate (sync burst)
Range is not as crucial as detection time*
Reference Es/No = 22 dB
(sync burst)
Range
Range loss relative to ~ 1.5 dB propagation loss
Reference distance = ?
Transmission rate
PSDU is sent every 40 ms
faster detection by WRAN
faster beacon aggregation (on-channel)
PSDU is sent less frequently
currently 1 per second
-constraint for WRAN scheduling
Reliability
FEC can be added independently.
4 bits free in sync burst.
FEC can be added independently
(*) Why detection time is more crucial than range: 2 sec detection time is required in all cases. Having only one CPE at the edge of the keep-out region is a rare event (CPE receiver diversity is assumed in most cases, with CPEs close to the wireless microphone or well within the keep-out region)
David Mazzarese, Samsung
John Doe, Some Company

4. Backup slides (from 22-06-0234-04-0001_Samsung_Beacon_Simulations.ppt)
January 2007
Backup slides (from _Samsung_Beacon_Simulations.ppt)
David Mazzarese, Samsung

5. Month Year
doc.: IEEE yy/xxxxr0
January 2007
Transmitter with complex spreading and dual channel, using DQPSK modulation +
PSDU Data
Pilot: sync & count-down Q I
Complex spreading
Beacon Signal
Z-1
David Mazzarese, Samsung
John Doe, Some Company

6. Frame structure: dual channel with sync-N burst and complex DSSS
January 2007
Frame structure: dual channel with sync-N burst and complex DSSS
sync N
N-1
PSDU I Q
Rx period
ANP
One Packet, constant length 49 bytes with proposed revision (doc Nov 2006)
David Mazzarese, Samsung

7. Receiver structure with DQPSK
January 2007
Receiver structure with DQPSK
David Mazzarese, Samsung

8. January 2007
1.5 dB
David Mazzarese, Samsung