PDF《DWA Wireless GmbH, Germany》

May

2005 Andreas Wolf, DWA Wireless Slide

1 doc.

: IEEE 15-05-0216-04-004b Submission Project: IEEE P802.15 Study Group for Wireless Personal Area Net Project: IEEE P802.15 Study Group for Wireless Personal Area Networks ( works (WPANs WPANs) ) Submission Title: PSSS proposal C Parallel reuse of 2.4 GHz PHY for the sub-1-GHz bands Date Submitted: 17th May

2005 Source: Andreas Wolf, DWA Wireless GmbH DWA Wireless GmbH, Germany Tel.: +49 (0)700

965 32

637 aw@dw-a.com hvl@highstream.net Re: PSSS mode for more even chiprates, simpler filter, and

250 kbit/s in

868 MHz and new less complex preamble. Abstract: Ballot comments received indicated interest in the TG4b task group to modify the PSSS mode for

868 MHz to have the same

250 kbit/s bitrate as the 2.4 GHz and the PSSS

915 Mhz modes. Offering also simpler preamble. Purpose: Response to ballot comments to discuss potential modifcation of PSSS draft specification Notice: This document has been prepared to assist the IEEE P802.15. 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 acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. May

2005 Andreas Wolf, DWA Wireless Slide

2 doc.: IEEE 15-05-0216-04-004b Submission Highlights of Proposed Changes ? PSSS 250-400 C Increases data rate from

200 kbps to 250kps C Reduces chip rate from

440 kcps to

400 kcps C Increases number of sequences from

15 to

20 C Changes shift between sequences from

4 sub-chips to

3 sub-chips C Reduces pulse shaping filter requirement ? New preamble C Uses PSSS code

0 instead of Barker sequence ? Allows reuse of HW for sync. C

32 chip vs Barker seq. length of

26 C Repeated

4 times for

868 MHz and

16 times for

915 MHz ? Equal time of

320 ?s for both ? New SFD C Uses code

0 inverted one time ? Allows reuse of HW for detection May

2005 Andreas Wolf, DWA Wireless Slide

3 doc.: IEEE 15-05-0216-04-004b Submission Discussion:

250 kbit/s PSSS for

868 MHz Key Considerations ? Comments indicated interest in the TG4b task group to provide

250 kbit/s for bot

868 and

915 MHz C Marketing benefit of having homogenous bit rate in all bands ? Discussion of implementation complexity due to uneven chip rates C Clarifications from chip vendors have shown that

440 kcps is not truly a concern C will not increase implementation size C Simply changing to

400 kcps rate in current PSSS specification is not attractive due to bitrate <

200 kbit/s (OEM concern) C Modifiation of PSSS mode to

400 kcps rate at

250 kbit/s possible ? Modified PSSS mode for

250 kbit/s in

868 MHz will even decrease filter complexity C Implementation complexity on Tx side1 (of both COBI and PSSS) is clearly driven by compliance to ETSI PSD mask in

868 MHz 1: Key driver for implementation complexity on Rx side is need to withstand interference (dynamic range, linearity of Rx frontend) May

2005 Andreas Wolf, DWA Wireless Slide

4 doc.: IEEE 15-05-0216-04-004b Submission The PSSS mode for

868 MHz could be modified to

250 kbit/s while even decreasing implementation complexity Enhanced original PSSS mode Single BPSK / ASK radio 20x 32-chip seq. 20/32 bit/s/Hz

250 kit/s

400 cps

600 kHz PSSS 250-4001