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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Comment resolution for CID 259 Date Submitted: September 21, 2011 Source: Khurram Waheed, Timothy Schmidl Company [ . Freescale Semiconductor, Inc; Texas Instruments, Inc. ]

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Comment resolution for CID 259 Date Submitted: September 21, 2011 Source: Khurram Waheed, Timothy Schmidl Company [.Freescale Semiconductor, Inc; Texas Instruments, Inc.] E-Mail: khurram.waheed@freescale.com; schmidl@ti.com Re: Supporting resolution to IEEE 802.15.4g Sponsor Ballot CID 259 Abstract: Resolution to IEEE 802.15.4g Sponsor Ballot CID 259 Purpose: Smart Utility Networks 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. Slide 1 Slide 1

  2. CID 259 Comment: The description of the cyclic prefix insertion is confusing, especially to non-english speaking readers. It is best to illustrate the CP additon Commenter’s Proposed Resolution: For clarity, please include an illustration of how cyclic prefix is added Slide 2 Slide 2

  3. Proposed Resolution to CID 259 Revised. Change the introductory paragraph in 16.2.1.2 as below 16.2.1.2 Long Training field (LTF) The LTF structure in both the frequency and time domain is described in the following subclauses. Move Figure 128 to section 16.2.1.2.2 Above Figure 128 insert the following: “The time-domain LTF structure is shown in Figure 128, and TDFT is the duration of the base symbol.” Change text on line 54 (below equation) in 16.2.1.2.2 as follows: A 1/2 symbol cyclic prefix is prepended to two consecutive copies of the base symbol as shown in Figure 128. For more details, please see section 16.2.3.8. Editorial Change in Figure 130: Correct the section reference for Cyclic Prefix in Figure 130 to 16.2.3.8. Modify section 16.2.3.8 as shown on the next slide Slide 3 Slide 3

  4. 16.2.3.8 Cyclic prefix For the STF, the cyclic prefix (CP) is defined in 16.2.1.1.3 . For the LTF, the CP is defined in 16.2.1.2.2. For the remaining OFDM symbols, a CP shall be prepended to each base symbol. The duration of the CP (24 ms) shall be 1/4 of the base symbol (96 ms). The CP is a replication of the last 24 ms of the base symbol. The CP is illustrated in Figure 136a. In Figure 136a, N is the number of samples in the base symbol, while L is the length of the CP that is added to base symbol. Figure 136a CP base Symbol N-L N-1 0 N-L N-1 Copy the last L samples of the base symbol Slide 4 Slide 4

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