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Revised PHY Proposal

Revised PHY Proposal. Authors:. Date: 2012-05-17. Slide 1. Proposal. The PHY for one TVWS channel (6MHz, 7MHz or 8MHz) is based on the 40MHz 128FFT VHT PHY as defined in clause 22 as-is.

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Revised PHY Proposal

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  1. Revised PHY Proposal Authors: Date: 2012-05-17 Ron Porat, Broadcom Slide 1

  2. Proposal • The PHY for one TVWS channel (6MHz, 7MHz or 8MHz) is based on the 40MHz 128FFT VHT PHY as defined in clause 22 as-is. • VHT20 is found to be less suitable due to the lower downclocking ratio expected for 8MHz channels (around 3) and the sharp filtering reducing the effective GI length [1][2][3] • Note also that the pre-VHT fields in a VHT 40MHz PHY are duplicated (each one occupying half the channel) • Support for multi-channel coexistence - the pre-VHT fields shall be placed around the middle of each TVWS channel irrespective of the number and location of the channels used for transmission Ron Porat, Broadcom Slide 2

  3. Cont. - Sampling Clock • Having an even integer number of tones defined in a TVWS channel simplifies the spec as all signals are directly mapped to the correct tone location • We propose that the tone spacing for 6MHz TVWS channels equals which translates to a sampling clock of the 128FFT which is easy to generate. • Hence the location of the pre-VHT fields for 2 contiguous channels shall be centered around tones -72 and 72 and with 4 contiguous channels around tones -216, -72, 72, 216 • The sampling clock for 8MHz channels is defined in the same way by having 144tones in 8MHz Ron Porat, Broadcom Slide 3

  4. Motion • Do you support the proposed design in slides 2,3? • Y • N • A Ron Porat, Broadcom Slide 4

  5. [1] 11-11-1544-01-00af-initial-proposal-for-tgaf-phy.pptx [2] 11-12-424-00-00af-tgaf-phy-downclocking.pptx [3] 11-12-0616-00-00af-PHY-proposal.pptx References Ron Porat, Broadcom Slide 5

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