January 2005 doc IEEE 802 15 -05

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a Project: IEEE P 802. 15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Band plan and PRF considerations] Date Submitted: [4 January, 2005] Source: [Gadi Shor, Sorin Goldenberg] Company: [Wisair] Address: [24 Raoul Wallenberg st. Ramat Hachayal, Tel-Aviv, ISRAEL] Voice: [+972 -3 -7676605] FAX: [+972 -3 -6477608], E-Mail: [gadi. shor@wisair. com] Re: [802. 15. 4 a] Abstract: [802. 15. 4 a Comments on Band Plan and PRF] Purpose: [Comments on Band Plan and PRF] Notice: This document has been prepared to assist the IEEE P 802. 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 P 802. 15. Submission 1 Gadi Shor, Sorin Goldenberg (Wisair)

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a Bandwidth • As discussed in the past the BW of each sub-band does not have to be related to the separation between the center frequencies and is actually defined by the pulse shape • The only requirement comes from FCC and is to have a 10 d. B bandwidth greater than 500 MHz • Wisair suggest to change its proposal to reflect a 500 MHz BW for the signal. This can be done by the other proposals as well. Submission 2 Gadi Shor, Sorin Goldenberg (Wisair)

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a Margin to 3. 1 and 4. 9 • The requirements on the margin to 3. 1 and 4. 9 is not equal from two reasons: – RF filter implementation with a given Q is frequency dependent therefore it is easier to filter the 3. 1 corner than the 4. 9 corner – The co-existence requirements to/from WLAN are tougher than FCC indoor/outdoor requirements therefore more room should be given at the 4. 9 corner Submission 3 Gadi Shor, Sorin Goldenberg (Wisair)

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a PLL implementation • It is important that the first divisions in a PLL implementation will be small (preferably two division by 2) • The frequency plan suggested by Wideband Access requires a first division by 5 for the 19. 2 MHz XO Submission 4 Gadi Shor, Sorin Goldenberg (Wisair)

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a PRF flexibility • Wisair’s proposal allows selection between: 11, 22, 33, 66 MHz while still allowing a first division by 4 • The Wideband Access proposal allows a PRF of 13 if we use a first division by 4 or 26 if we use a first division by 2 followed by a second division by 67 (for the 3484). Higher PRFs can not be generated directly from the VCO Submission 5 Gadi Shor, Sorin Goldenberg (Wisair)

January 2005 doc. : IEEE 802. 15 -05 -0242 -01 -004 a PRF and peak power • The estimation provided so far does not take into account losses between the component and the antenna: – Internal/external filter, – Packaging – Routing • It is important to support higher PRFs to allow taking the full advantage of FCC rules (even if we select a lower PRF as the base mode) Submission 6 Gadi Shor, Sorin Goldenberg (Wisair)