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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: TG4a PRF (Pulse Repetition Frequency) Selection Guidelines Date Submitted: May 2005 Source: Gian Mario Maggio (STMicroelectronics), Philippe Rouzet (STMicroelectronics)

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: TG4a PRF (Pulse Repetition Frequency) Selection Guidelines Date Submitted: May 2005 Source: Gian Mario Maggio (STMicroelectronics), Philippe Rouzet (STMicroelectronics) Contact: Gian Mario Maggio Voice: +41 22 929 6917, E-Mail: maggio@ieee.org Abstract: PRF value(s) selection guidelines for TG4a PHY standard (UWB-IR part) Purpose: To provide information for further investigation and selection of the PRF value(s) for UWB Impulse Radio (low bit-rate plus ranging) 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. Gian Mario Maggio & Philippe Rouzet (STM)

  2. PRF (Pulse Repetition Frequency) Selection Guidelines Gian Mario Maggio & Philippe Rouzet (STMicroelectronics) Gian Mario Maggio & Philippe Rouzet (STM)

  3. PRF Selection Strategy • For each sub-band (mandatory + optionals), based on physical parameters, derive PRF range: • Min PRF (technology, regulation, ranging, etc.) • Max PRF (channel delay spread, etc.) • Optimize PRF value(s) based upon design parameters: • Modulation/demodulation • Acquisition • Implementation • … Gian Mario Maggio & Philippe Rouzet (STM)

  4. PRF: Physical Parameters (1/2) Gian Mario Maggio & Philippe Rouzet (STM)

  5. PRF: Design Parameters (2/2) Gian Mario Maggio & Philippe Rouzet (STM)

  6. Supporting Material • I2R - Francois Chin (15-05-0231-00-004a): PRF definition, Minimum PRF • Wideband Access - Ismail Lakkis/Saeid Safavi (15-05-0226-01-004a): Minimum PRF • Wisair - Gadi Shor (15-05-0213-00-004a): PRF proposals • CEA-LETI/STM: PRP vs. pulse amplitude and peak power Gian Mario Maggio & Philippe Rouzet (STM)

  7. PRI VPeak TC (a) PRF: Definition • Pulse repetition frequency (PRF): Number of pulses occurring in 1 s. • Pulse repetition interval (PRI): Time from the beginning of one pulse to the beginning of the next. Gian Mario Maggio & Philippe Rouzet (STM)

  8. (a) PRF Definition: Example Pulse Repetition Interval 1 2 3 4 5 6 7 8 N-1 N ………………………… Non-inverted pulses are blue, Inverted pulses are green. …………………………................. Quiet time Active time Symbol Interval Gian Mario Maggio & Philippe Rouzet (STM)

  9. (a) Minimum PRF Requirements Gian Mario Maggio & Philippe Rouzet (STM)

  10. (b) Minimum PRF Requirements Gian Mario Maggio & Philippe Rouzet (STM)

  11. (c) PRF Proposals • The PRF represents the rate of transmission of the basic pattern. The PRF is an integer division of all center frequencies. The basic PRF is 66 MHz. A PRF of 33 MHz is also supported for environments with long delay spread. • Justification: PRF can be generated from a PLL by dividing the center frequency down to the PRF. The first divisions can be based on the divisions implemented as part of the PLL. The center frequencies and PRF are selected such that the first two divisions for off the shelf XOs are divisions by 2. This simplifies the implementation of the high frequency division elements. Gian Mario Maggio & Philippe Rouzet (STM)

  12. Fcc limit : 0 dBm (upper band only) (d) PRP vs. Pulse Amplitude and Peak Power Gian Mario Maggio & Philippe Rouzet (STM)

  13. Conclusions (Preliminary) • Scalable PRF: • Bands supported: 500MHz (mandatory), 1.5 GHz • No. of supported PRF values: 2 (or more) • For CMOS 90nm, PRF lower bound @500 MHz seems to be ~10 MHz • Proposed PRF values (so far): • Basic: 13/33 MHz • Optional: 26/66 MHz • PRI value to be dictated by sequence design • Note: PRF requirements may be mitigated by the adoption of multi-pulse chips Gian Mario Maggio & Philippe Rouzet (STM)

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