Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [802.15.4 Multipath] Date Submitted: [July 2004] Source: [Paul Gorday] Company: [Motorola] Address: [8000 W. Sunrise Blvd., Plantation, FL, 33322, USA]

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

Submission Title: [802.15.4 Multipath]

Date Submitted: [July 2004]

Source: [Paul Gorday] Company: [Motorola]

Address: [8000 W. Sunrise Blvd., Plantation, FL, 33322, USA]

Voice:[+1 561 723 4047], E-Mail:[[email protected]]

Re: [ IEEE 802.15.4 ]

Abstract: [This contribution presents simulated performance of a simple 802.15.4 (2.4 GHz PHY) receiver in multipath channel conditions.]

Purpose: [To encourage discussion.]

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.

Paul Gorday, Motorola


Motivation l.jpg
Motivation Area Networks (WPANs)

  • Proposed modifications to 868/915 MHz PHY consider additional multipath tolerance for long-range applications.

  • Provide benchmark simulation results for the 2.4 GHz PHY, which would also apply to the proposed down-banded version.

Paul Gorday, Motorola


2 4 ghz phy simulation l.jpg
2.4 GHz PHY Simulation Area Networks (WPANs)

  • Floating point simulation of optimum non-coherent demodulator.

  • Detection based on largest correlation peak (largest path) … No RAKE or equalizer.

  • Assume channel is constant throughout packet (quasi-static) and uncorrelated from packet to packet.

  • Record average packet error rate (PER) vs. Eb/No.

Paul Gorday, Motorola


2 4 ghz channel model l.jpg
2.4 GHz Channel Model Area Networks (WPANs)

  • No channel model was specified by 802.15.4

  • Commonly used diffuse exponential model

    • 802.11 Handbook [1]

    • 802.15.3a Narrowband Model [2]

    • ETSI BRAN, HIPERLAN/2 [3]

    • Many textbooks [e.g., 4]

  • Detailed channel models are being developed by 802.15.4a for a variety of environments, but are not finished.

Paul Gorday, Motorola


Diffuse exponential model l.jpg
Diffuse Exponential Model Area Networks (WPANs)

  • Diffuse – each delay bin

  • contains multipath energy

  • Exponential – average power

  • decays exponentially

  • Fading - each delay bin has

  • independent Rayleigh fading

  • Single Parameter:

    • RMS delay spread = 

    • Mean excess delay 

    • Max excess delay (10 dB)  2.5

    • Max excess delay (20 dB)  5

C = Normalization Constant

Ts = Simulation Sample Period

Normalized Average Power

Depicted:  = 4Ts

k (Bin #)

Paul Gorday, Motorola


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Results for 2.4 GHz PHY Area Networks (WPANs)

  • Acceptable performance

  • for   400 ns

  • RMS delay spread = 400 ns

  • Mean excess delay 400 ns

  • Max excess delay (10 dB)  1 s

  • Max excess delay (20 dB)  2 s

  • Results scale with chip rate

  •  half-rate at 915 MHz would

  • tolerate RMS delay spreads

  • up to 800 ns

Paul Gorday, Motorola


802 11a hiperlan 2 models 3 l.jpg
802.11a/HIPERLAN/2 Models Area Networks (WPANs)[3]

Paul Gorday, Motorola


Ieee 802 11 handbook 1 l.jpg
IEEE 802.11 Handbook Area Networks (WPANs)[1]

Paul Gorday, Motorola


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Factory/Office Measurements Area Networks (WPANs)[4]

Tx-Rx separation < 30 m

Paul Gorday, Motorola


Conclusions l.jpg
Conclusions Area Networks (WPANs)

  • 802.15.4 (2.4 GHz PHY) with simple non-coherent demodulator can tolerate RMS delay spreads up to 400 ns  sufficient for most WLAN applications, more than enough for WPAN applications.

  • Down-banded, half-rate 2.4 GHz PHY would tolerate RMS delay spreads up to 800 ns.

  • Additional delay spread tolerance may be achievable with some increase in demodulator complexity.

Paul Gorday, Motorola


References l.jpg
References Area Networks (WPANs)

[1] B. O’Hara and A. Petrick, IEEE 802.11 Handbook – A Designer’s Companion, IEEE Press, 1999.

[2] J. Foester, “Channel Modeling Sub-committee Report (Final),” IEEE P802.15-02/490r1-SG3a, Feb. 2003.

[3] J. Medbo and P. Schramm, “Channel Models for HIPERLAN/2,” ETSI/BRAN doc. No. 3ERI085B, 1998.

[4] K. Pahlavan and A. Levesque, Wireless Information Networks, John Wiley & Sons, 1995.

Paul Gorday, Motorola


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