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Wireless Display Throughput Requirements

This document provides preliminary results of the IMST data analysis on wireless display throughput requirements. It includes measurement scenarios, examples of measured channel impulse responses, possible channel model candidates, and a summary of the analysis.

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Wireless Display Throughput Requirements

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Wireless Display Throughput Requirements] Date Submitted: [January 2006] Source: [Ali Sadri, Alexander Maltsev, Alexei Davydov] Company: [Intel Corporation] Address: [Intel Corporation, 13290 Evening Creek Drive ,San Diego , CA 92128-3419 ,USA] Abstract: [IMST data analysis ,Preliminary results] Purpose: [To provide Preliminary results of the IMST data analysis] 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. Ali Sadri (Intel Corporation)

  2. Goals of preliminary data analysis • Understand the behavior of indoor mmWave channel under different conditions • Determine the basic parameters of the channel from measured data • Propose possible channel model candidates Ali Sadri (Intel Corporation)

  3. Measurement scenarios • Library environment with tables, chairs and metal bookshelves with books • 3 main types of measurement scenarios • LOS: unobstructed line of sight conditions • Edge: partially obstructed line of sight by the edge of a metal bookshelf • NLOS: non line of sight obstructed by a densely filled bookshelf • 3 types of RX antennas (horn, dipole array antenna, biconical) • Fixed TX lens antenna position at the suspended ceiling, RX measurements range ~2-5m • Time resolution is 1/960MHz ≈ 1ns Ali Sadri (Intel Corporation)

  4. Measurement scenarios plan LOS NLOS Edge Ali Sadri (Intel Corporation)

  5. Examples of measured channel impulse responses and PDP curves for LOS (far/near RX positions) ~30 dB Clustering in time due to reflection from neighboring objects Almost linear in dB scale decay of multipath part Strong LOS component Ali Sadri (Intel Corporation)

  6. Examples of measured channel impulse responses for Edge scenario Oscillations due to Fresnel diffraction effects and interference of direct and reflected from metal sidewall waves Shadow from metal sidewall of bookshelf Penetration from books Ali Sadri (Intel Corporation)

  7. Examples of measured channel impulse responses and PDP curves for NLOS Bookshelf gives ~15 dB penetration loss. The attenuation is heterogeneous in space. The main ray is not completely faded. Ali Sadri (Intel Corporation)

  8. PDF of rays in multipath region Rayleigh distribution gives good fitting to distribution of measured ray amplitudes in multipath region Ali Sadri (Intel Corporation)

  9. Candidates for channel models • Tap delay line model with average power profile • Channel model with exponentialpower delay profile for multipath region • Saleh-Valenzuela channel model with random amplitude, delay time and angle of arrival of scattered rays Ali Sadri (Intel Corporation)

  10. Tap-delay line model: example of PDP for LOS environment Note: Some typical power delay profiles may be used for different scenarios (LOS, NLOS). Fixed time of arrival is assumed for each ray. Ali Sadri (Intel Corporation)

  11. Exponential model: Tapped delay line with typical profile Instantaneous channel impulse response may be represented as the sum of LOS and NLOS components Non line of site component with Rayleigh distributed amplitude Line of site component with constant amplitude (αLOS(k) = 0, k ≠ 0) NLOS average power delay profile may be approximated by exponential model Note: Two parameters are required for description of channel model: exponent parameter τ0 (RMS delay) and power ratio of LOS to NLOS component on first (zero index) tap. Ali Sadri (Intel Corporation)

  12. Saleh-Valenzuela channel model Complex amplitude of a ray in multipath region Time arrival of cluster l Time arrival of ray k in cluster l Instantaneous impulse response of channel Line of site component Delta function Average power of the ray amplitude depends on cluster delay Tl and kth-ray delay τk,l inside of cluster l - cluster power decay constant - power decay constant of rays in cluster l Notes: 1. Random angle of arrival may be also included in model. 2. Needs some criteria for parameter estimation. Ali Sadri (Intel Corporation)

  13. Summary • The preliminary analysis of measured data confirmed theoretical view on mmWave propagation features in indoor environment • Three possible channel model candidates may capture observed effects • Measured data allows to analyze more complex spatial characteristics of mmWave channel (angle of arrival, ray clustering, two dimensional field structure, etc) • More analysis is needed Ali Sadri (Intel Corporation)

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