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MSS Interference Analysis for AeroMACS

MSS Interference Analysis for AeroMACS. October 12, 2012. Introduction. Working group was established by RTCA SC-223 Charter:

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MSS Interference Analysis for AeroMACS

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  1. MSS Interference Analysis for AeroMACS October 12, 2012

  2. Introduction • Working group was established by RTCA SC-223 • Charter: • “Define a working method of specifying emissions from all expected AeroMACS future deployments that are compliant with ITU co-interference requirements, to establish 2-way link levels with the aircraft to ensure closure of the RF-link without adversely affecting the Global Star Satellite feeder links. The deliverable would be in the form of MOPS or SARPS requirements and a technical report delivered to an ICAO technical group via a working paper.”

  3. MSS Interference Analysis WG Participants • FAA - Brent Phillips • FAA - Mike Biggs • DFS - Armin Schlereth • ECTL - Nikos Fistas • INDRA – Antonio Correas Uson • SINTE - Jan Eric Hakegard • NASA - Jeff Wilson • NASA - Rafael Apaza • Harris - Art Ahrens • ITT Exelis - Bruce Eckstein • ITT Exelis - Natalie Zelkin • ITT Exelis – Ward Hall

  4. Analysis Method • Very large and Large size airports • US categories: XL/Large/OEP (Qty 35) • Europe categories: Very Large/Large (Qty 50) • Model parameters • Horizon-omni base station pattern • 2x transmitter PA power • All AeroMACS channels* are used • Medium size airports US category: Class C (Qty 123) • Europe category: Medium (Qty 50) • Model parameters • Horizon-omni base station pattern • 1x transmitter PA power • AeroMACS channel use factor • Small size airports • All other airports in Openflights database. • Model parameters • Base station sector directional antennas • Sectors pointed in random directions • 1x transmitter PA power • AeroMACS channel use factor • All airports world-wide are included in the analysis • Non-US and Europe airports found to not to contribute significantly to N. Atlantic interference “hotspot” The analysis method was driven by the European study [1] of number of sectors required at an airport (e.g., if the number of sectors was greater than 11 (number of channels in 5091-5150) then a “pseudo-omni was assumed as a given channel would be used in more than one direction) [1] WA4 Airport Capacity & Coverage • An AeroMACS “channel” is the 5 MHz-wide bandwidthtransmitted by a base station sector that consists of 512 • sub-carriers

  5. Analysis Conditions and Assumptions • Effective isotropic Radiated Power (EiRP) is the sector transmit power at the antenna input plus antenna gain • Maximum allowable EiRP in a base station sector shall be the sum of both transmit power amplifiers (PA’s) in a 2-channel MIMO system • Base Station Sector patterns are defined to be ITU-R F-1336-2 reference patterns with 120˚ 3dB beamwidth toward the Horizon • Zero base station pattern down-tilt • Scaling assumptions: • A factor for occupied number of channels per airport category • 22 channels used for large airports • 6 of 11 channels for medium airports • 1 of 11 channels for small airports • Apply a 50% power reduction to small airports • MSS interference analysis completed by NASA using Visualyze software

  6. Recommendedgain mask

  7. Draft Limits Table • Airport Category Definitions – Based on ICAO airspace definitions

  8. Recommendations • The ACP WG is invited to consider using the provided information as the basis of ICAO SARPs spectrum requirements for AeroMACS.

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