1. Comparison of CBP PHY Modes
Jul. 2008
doc.: IEEE yy/xxxxr0
Jul. 2008
Comparison of CBP PHY Modes
IEEE P Wireless RANs Date:
Authors:
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Cheng Shan, Samsung Electronics

2. Jul. 2008
Abstract
This contribution provide supplementary information in response to the resolution of comment 672 of D1.0.
Cheng Shan, Samsung Electronics

3. Jul. 2008
Simulation Diagram
Cheng Shan, Samsung Electronics

4. CBP PHY in D1.0 (Mode 0) Data Carrier: 1254 Pilot Carrier: 426
Jul. 2008
CBP PHY in D1.0 (Mode 0)
Data Carrier: 1254
Pilot Carrier: 426
Repetition: 3
Effective Payload per OFDM Symbol: 418
Interleaver Parameters: p=40; q=2; j=2;
Cheng Shan, Samsung Electronics

5. New CBP PHY Design (Mode 1)
Jul. 2008
New CBP PHY Design (Mode 1)
Data Carrier: 624
Pilot Carrier: 216
Repetition: 1
Effective Payload per OFDM Symbol: 624
Interleaver Parameters: p=3; q=2; j=3;
Cheng Shan, Samsung Electronics

6. New CBP PHY Design (Mode 2)
Jul. 2008
New CBP PHY Design (Mode 2)
Data Carrier: 624
Pilot Carrier: 216
Repetition: 2
Effective Payload per OFDM Symbol: 312
Interleaver Parameters: p=3; q=2; j=3;
Cheng Shan, Samsung Electronics

7. New CBP PHY Design (Mode 3)
Jul. 2008
New CBP PHY Design (Mode 3)
Data Carrier: 312
Pilot Carrier: 108
Repetition: 1
Effective Payload per OFDM Symbol: 312
Interleaver Parameters: p=40; q=2; j=2;
Cheng Shan, Samsung Electronics

8. Jul. 2008
Simulation Result
Cheng Shan, Samsung Electronics

9. Benefit by using sub-channelized CBP
Jul. 2008
Benefit by using sub-channelized CBP
Less latency
Two cells can exchange CBP packets within one SCW; latency almost halved;
Less collision probability as equivalently there are more SCW active repetition patterns available;
Cheng Shan, Samsung Electronics

10. Tradeoffs Jul. 2008 Jul. 2008 doc.: IEEE 802.22-yy/xxxxr0
Frequency Offset Consideration
As IEEE assumes fixed transmission, Doppler shift caused by fading channel is neglectable; thus the frequency offset problem is mainly caused by local oscillator frequency mismatch between transmitter and receiver;
All CPEs belongs to one cell have adjusted their frequency to that of their BS through ranging;
Only two CBP packets on two sub-channels from CPEs belong to two different cells may pollute each other by frequency mismatch
However, since the BSs are finely adjusted for their carrier frequency, this frequency mismatch should not be significant. (This is also the basis of interference-free scheduling mechanism in frequency domain)
Complexity and Throughput
Increased complexity since CPE needs to detect multiple preambles, if multiple preamble detected, CPE needs to detect multiple CPE payloads on difference bands;
In the above scenario, CBP throughput is also significantly enhanced since multiple CBP packets are received at the same time;
Cheng Shan, Samsung Electronics

11. Summary Comparable BER performance More efficiency
Jul. 2008
Summary
Comparable BER performance
Tradeoff between robustness and payload capacity per symbol should be determined;
More efficiency
More system CBP throughput, less latency for those protocols relying on CBP; less collision probability;
No critical frequency offset problem
Slightly increased complexity for CBP decoder
Cheng Shan, Samsung Electronics