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FPP SUN Simulation Results – Redpine Signals

This presentation summarizes the performance results of the “Future-Proof” OFDM PHY Merged proposal for Option-2 and Option-3 in IEEE 802.15.4g PHY.

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FPP SUN Simulation Results – Redpine Signals

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: FPP SUN Simulation Results – Redpine Signals Date Submitted: 6 July, 2009 Source: Partha Murali Company: Redpine Signals Inc. Address: 2107 N First Street, Suite #680, San Jose, USA Voice: +1 408 242 8506, E-Mail: partha.murali@redpinesignals.com Re: IEEE 802.15 Task Group 4g Call for Proposals (CFP) on 22 January, 2009 Abstract: This presentation summarizes the performance results of the “Future-Proof” OFDM PHY Merged proposal for Option-2 and Option-3 Purpose: Simulation Results demonstrating the performance of the Merged OFDM proposal for 802.15.4g PHY 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. Partha Murali, Redpine Signals Inc.

  2. Future Proof Platform for SUN: Simulation Results – Redpine Signals Partha Murali IEEE 802 Plenary Session San Francisco July 2009 Contributors: Rishi Mohindra [MAXIM], Emmanuel Monerie [Landis & Gyr], Steve Shearer [Independent], Shusaku Shimada [Yokogawa Electric Co.], Bob Fishette [Trilliant], Sangsung Choi, [ETRI], Roberto Aiello [Independent], Kendall Smith [Aclara], David Howard [On-Ramp] Partha Murali, Redpine Signals Inc.

  3. Outline • Future Proof OFDM PHY overview of modes simulated • Tx Model for Scalable OFDM PHY • Channel Model Used • Simulation Results - AWGN • Simulation Results - Multipath • Sensitivity and Link Margin Calculations • Summary • References Partha Murali, Redpine Signals Inc.

  4. Future-Proof OFDM PHY – Modes simulated are highlighted • For details on the proposed OFDM-PHY please refer to • 15-09-0489-01-004g-FPP-SUN-Detailed-Proposal.doc Partha Murali, Redpine Signals Inc.

  5. Tx Model for Scalable OFDM PHY Partha Murali, Redpine Signals Inc.

  6. Multipath Channel Model used Partha Murali, Redpine Signals Inc.

  7. Multipath Channel Matlab Code (for Reference) function [y]=two_ray_multipath_channel(x,amp1,amp2,n_FsDelay) % x is the input to the Multipath channel % y is the output of the Multipath channel %amp1 = Average amplitude of 1'st path in dB %amp2 = Average amplitude of 2'nd path in dB %n_FsDelay = Delay in Number of Samples at the sampling rate of x. % If x is sampled at 3125KHz (5x) and n_FsDelay=16 then sample delay of second tap is 5us. RV1=(randn(1,1)+j*randn(1,1))/sqrt(2)*10^(amp1/20); RV2=(randn(1,1)+j*randn(1,1))/sqrt(2)*10^(amp2/20); y=(x*RV1 + [zeros(1,n_FsDelay) x(1:(length(x)-n_FsDelay))]*RV2)/sqrt(10^(amp1/20) + 10^(amp2/20)); Partha Murali, Redpine Signals Inc.

  8. Notes on Simulation • Channel Models used are from: ETSI EN 300 392-2 v3.2.1 which are chosen for SUN simulations • Channel was Sampled at 5x sampling rate of signal (625Khz * 5 = 3125Khz) • The Multipath Fading channel output should “not” be normalized for each packet. The Multipath Fading channel has “unit-normalized” gain in the “ensemble” sense over multiple packets. • All PER plots are with respect to Ensemble SNR (dB) = Tx Signal Power – Path-Loss – 20*log10(k*T*B). • SNR at Receiver input was varied by varying the Path Loss • 500 channel realizations were simulated for each Path loss (each SNR point) to estimate the PER at that SNR Partha Murali, Redpine Signals Inc.

  9. Simulation Results: AWGN – Summary Partha Murali, Redpine Signals Inc.

  10. Simulation Results: AWGN – Summary Partha Murali, Redpine Signals Inc.

  11. Partha Murali, Redpine Signals Inc.

  12. Simulation Results: Multipath – Summary Partha Murali, Redpine Signals Inc.

  13. Sensitivity and Link Budget Calculations (Bandwidth Option-2) Partha Murali, Redpine Signals Inc.

  14. Summary, Conclusions and Discussion • “Multipath Fade Margin” Reduces Considerably with BICM (Bit-Interleaved Coded Modulation) OFDM Systems • The difference in performance between AWGN and Fading results is about 7dB for Option-2 • Dummy repeater nodes would be minimal in most deployments (even sub-urban & rural) => easy to approach 100% regional coverage for AMI & Smart-grid • Excess link-margin can be traded OFF for lesser Tx Power (simpler PA => low-cost, low-power) • Future-Proof OFDM provides scalable bandwidth Options • Fits all regulatory domains – 1x, 2x, 4x, 8x and 16x bandwidth options • Bandwidth options 2 and 3 are simulated in this document • Future-Proof OFDM provides scalable data-rates in each bandwidth option • 94-750Kbps for Option-2 (>15dB range in SNR of operation) • 43-516Kbps for Option-3 (>20dB range in SNR of operation) • All the above is achieved in a coherent fashion with a simple symbol structure to enable single chipset implementations for multiple bandwidth options Partha Murali, Redpine Signals Inc.

  15. THANK YOU Partha Murali, Redpine Signals Inc.

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