1. IEEE P802.22 Wireless RANs Date: 2007-02-25
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
FEC on PSDU for the
IEEE P Wireless RANs Date:
Authors:
Notice: This document has been prepared to assist IEEE 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
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures 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 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at
>
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

2. Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
Abstract
In London meeting, one of the questions about FEC on Sync Burst is whether there is a proper FEC on PSDU so that make the performance of Sync Burst and PSDU matched with each other? We do some work on this issue and hope to resolve this problem. In this file we will show the design and simulation results of PSDU and compared it with Sync Burst performance.
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

3. Content FEC Design on PSDU Simulation condition and results. Questions
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
Content
FEC Design on PSDU
Simulation condition and results.
Questions
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

4. Figure 1: The FEC Design on PSDU
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
FEC Design on PSDU (1/3)
208-bit
PSDU Frame
4-bit
CRC
4-bit
zero
½ Rate (Output 432-bit)
Convolutional Code
Puncture to 384-bit
(40ms)
Modulation and Tx
Figure 1: The FEC Design on PSDU
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

5. FEC Design on PSDU (2/3) Feb 2007 Jan 2007 doc.: IEEE 802.22-07/0xxxr0
1) The Original 208-bit PSDU was added by 4-bit CRC and 4 Tail zero bit, now the number of total bits are 216 bits; 2) Then it was fed into ½ Convolutional Coder, the output are 432bits; 3) To make the PSDU not too long, it was punctured to 384bits(40ms); 4) Finally the punctured PSDU data was modulated and transmitted.
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

6. The Generator Polynomial of 4-bit CRC code is:
Feb 2007
FEC Design on PSDU (3/3)
The Generator Polynomial of 4-bit CRC code is:
The Two Generator Polynomials of ½ Rate Convolutional Code are:
Approximately uniform Puncture
Wu Yu-Chun, Huawei Hisi

7. Simulation Condition and Results (1/4)
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
Simulation Condition and Results (1/4)
1) Assume Perfect Symbol Synchronization; 2) 4-bit Quantization of received signal; 3) BPSK Modulation; 4) No Spreading yet; 5) AWGN and WRAN Profile_A channel; 6) Statistic Length: 100,000 Frames
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

8. Simulation Condition and Results (2/4)
Feb 2007
Simulation Condition and Results (2/4)
The simulation results of Both Sync Burst and PSDU performance with or without FEC are plotted in the following figures.
Figure 2: Simulation Results of Sync Burst and PSDU Frame under AWGN channel
Wu Yu-Chun, Huawei Hisi

9. Simulation Condition and Results (3/4)
Feb 2007
Simulation Condition and Results (3/4)
Figure 2: Simulation Results of Sync Burst and PSDU Frame under WRAN Profile_A channel
Wu Yu-Chun, Huawei Hisi

10. Simulation Condition and Results (4/4)
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
Simulation Condition and Results (4/4)
From the Simulation Results, we can see that
In the baseline, where the Sync Burst and PSDU are not protected with FEC, their performance difference is about 2~5dB. After apply FEC on both Sync Burst and PSDU, their performance difference is about 0.5dB. The performance gap was greatly reduced.
After apply FEC on both Sync Burst and PSDU, their performance was improved by about 4~7dB.
FEC on Sync Burst and PSDU also provide Error Detection capability on both of them, and error detection is very important for the WRAN to know whether he had decoded the received information correctly or not.
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

11. Any questions and suggestions on future work are highly appreciated
Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
Questions? (1/1)
Any questions and suggestions on future work are highly appreciated
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi

12. Jan 2007
doc.: IEEE /0xxxr0
Feb 2007
References
《 _Huawei_Beacon_Sync_Frame_Proposal》.
《 _WRAN_Sensing_Window》
Wu Yu-Chun, Huawei Hisi
Wu Yu-Chun, Huawei Hisi