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UWB PHY 15.6 Draft 2 Remaining Topics

This document discusses the remaining topics for the UWB PHY sub-group in IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs).

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UWB PHY 15.6 Draft 2 Remaining Topics

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [ UWB PHY 15.6 Draft 2 remaining topics ] Date Submitted: [March 15th, 2011] Source: [Marco Hernandez ] Company: [NICT] Address: [3-4 Hikarino-oka, Yokosuka, 239-0847, Japan] Voice:[+81 46-847-5439] Fax:[+81 46-847-5431] E-Mail:[] Re: [In response to the comment-resolution process of 2nd letter ballot of 802.15.6] Abstract: [ ] Purpose: [Material for discussion in the UWB PHY sub-group] 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. Marco H. (NICT)

  2. General PHY requirements • Maximum transmit power shall conform with local regulations. • Out-of-band spuriousemission shall conform with local regulations. • Receiver sensitivity definition: • Threshold input signal power that gives a specified PER<1% over a random PSDU length of 24 octets. • Power measured at antenna terminals. • Interference not present. Marco H. (NICT)

  3. General PHY requirements • Receiver maximum input level of desired signal shall be the maximum power level of the desired signal present at the input of the receiver for which the error rate criterion of PER<1% mentioned before is met. • A receiver shall have a receiver maximum input level greater than or equal to –32 dBm. Marco H. (NICT)

  4. General PHY requirements • Transmit center frequency tolerance shall be  20 ppm maximum. • Clock frequency tolerance shall be  20 ppm maximum. • The transmit center frequencies and the clock frequency shall be derived from the same seed oscillator. Marco H. (NICT)

  5. General PHY requirements • MAC-related timing parameters for the UWB PHY: Marco H. (NICT)

  6. Informative • In a nutshell: when a burst of packets is transmitted (burst mode), packets are separated by pMIFS (Minimum Inter-Frame Separation time). ACK packets are not transmitted. • Otherwise, packets are separated by pSIFS (Short Inter-Frame Separation time). Marco H. (NICT)

  7. General PHY requirements • The RX-to-TX turnaround time shall be between pSIFS and pSIFS + 5ms. • The Rx-to-Tx turnaround time is defined as the time taken from the last sample of the last received symbol is present on the air interface until the time when first sample of the first transmitted symbol of the SHR for the next frame is present on the air interface. Marco H. (NICT)

  8. General PHY requirements • The TX-to-RX turnaround time shall not be greater than pSIFS. • The Tx-to-Rx turnaround time is defined as the time taken from the last sample of the last transmitted symbol is present on the air interface until the time when the receiver is ready to begin the reception of first sample of the next PHY frame. Marco H. (NICT)

  9. General PHY requirements • When the burst mode is enable, the inter-frame spacing between uninterrupted successive transmissions shall be between pMIFS and pMIFS + 5 ms. • The inter-frame spacing is defined as the time taken from the last sample of the last transmitted symbol is present on the air interface until the time when the first sample of the first transmitted symbol of the SHR for the next packet is present on the air interface. Marco H. (NICT)

  10. Carrier sense for FM-UWB • The receiver energy detection (ED) measurement for CCA is an estimate of a signal’s power around its central frequency (meaningless when the signal’s power is below the noise floor). No attempt is made to identify or decode signals on the channel. • The ED threshold shall correspond to a receive signal power of at most 10 dB above the specified CP-2FSK receiver sensitivity value of -90 dBm. • The CCA measurement time shall be pCCATime=63 symbol periods or pEDTime=8 symbol periods. Marco H. (NICT)

  11. Clear Channel Assessment (CCA) • Mode 1: Slotted Aloha. CCA shall report an idle medium always. • Mode 2: Carrier sense. CCA shall report a busy medium upon detecting any energy above the ED threshold. • Mode 3: Preamble detection. CCA shall report a busy medium upon detection of a synchronization symbol as specified in sub-clause 10.x. An idle channel shall be reported if no preamble symbol is detected up to a period not shorter than the maximum packet duration plus the maximum period for acknowledgment. Marco H. (NICT)

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