Comparison of CBP PHY Modes Jul. 2008 doc.: IEEE 802.22-yy/xxxxr0 Jul. 2008 Comparison of CBP PHY Modes IEEE P802.22 Wireless RANs Date: 2008-05-11 Authors: Notice: This document has been prepared to assist IEEE 802.22. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.22. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures http://standards.ieee.org/guides/bylaws/sb-bylaws.pdf including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair Carl R. Stevenson as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.22 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at patcom@iee.org. > Cheng Shan, Samsung Electronics

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

Jul. 2008 Simulation Diagram Cheng Shan, Samsung Electronics

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

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

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

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

Jul. 2008 Simulation Result Cheng Shan, Samsung Electronics

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

Tradeoffs Jul. 2008 Jul. 2008 doc.: IEEE 802.22-yy/xxxxr0 Frequency Offset Consideration As IEEE 802.22 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

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