Transmit Site location and Transmit Antenna Description and Drawing

0027-EX-CM-2016 Pre Coordination Document

The MITRE Corporation

2016-09-12ELS_181875

TECHNICAL EXHIBIT AMENDMENT TO PENDING MODIFICATION APPLICATION OF THE EXPERIMENTAL FCC LICENSE The MITRE Corporation The MITRE Corporation is seeking to modify and existing FCC Experimental License to transmit data within the High Frequency (“HF”) band between 2.5 MHz and 28 MHz. This Exhibit describes the program of research and experimentation proposed, including: description of equipment and theory of operation; the specific objectives sought to be accomplished; and how the program of experimentation has a reasonable promise of contribution to the development, extension, expansion or utilization of the radio art and/or is along lines not already investigated. Research and Experimentation Program Description Assured beyond line-of-sight (BLOS) communications is a challenging problem yet essential for our warfighters. Military and civilian systems rely on a combination of high data rate satellite connectivity as well as low data rate HF Sky Wave communications. While satellite communication provides high data rate connectivity, there are vulnerabilities that include degradation and disruption of service. HF radio communication generally are limited to narrower bandwidths and lower data rates than satellite communications. To ensure critical communications are maintained, we are investigating the capability of higher bandwidth and higher data rate communications in the HF band applying polarization diversity MIMO concepts. Long distance HF communication is accomplished via reflection of HF radio waves off the ionosphere, a variable medium. This introduces challenges that must be overcome in order to make HF communications more reliable. These include multipath propagation and polarization rotation; both contribute to signal fades. We will demonstrate reliable BLOS HF communications at high data rates. Objectives The goal is to communicate reliably at a rate of 1-4 bits/Hz/s. We have developed a 100-kHz bandwidth waveform to achieve ~ 256 kbps with forward error correction (FEC) coding. Mitigation of signal fading and improved throughput will be accomplished using polarization diversity techniques and orthogonal coded waveform designs. Future year goals include investigating small antennas for mobility applications. The research program is planned to include a series of over-the-air (OTA) MIMO demonstrations, each testing new waveforms. We will continue to demonstrate and test whether we can use both X and O modes to carry independent communications channels and then determine the carrying capability of each at different bandwidths. A stretch goal is to extend to wider bandwidth waveforms, up to 1 MHz. (Researchers’ note: we understand that this wideband The MITRE Corporation 202 Burlington Road, Bedford MA 01730

FCC Office of Engineering and Technology (OET) Page 2 waveform may run up against other users and possibly cause interference. We plan to transmit at as low a power as possible and on a not-to-interfere basis. Please see red-highlighted text in Table 1a. We will also perform ionospheric sounding for channel characterization. The requested frequencies and transmission operational parameters are those permitted under Section 90.266 of the Commission’s Rules, Long Distance Communications on Frequencies below 25 MHz and are identified specifically in the FCC’s Electronic Code of Federal Regulations, Title 47 (Telecommunication), Volume 1, Chapter 1, Part 2.106 Table of Frequency Allocations. These frequencies bands requested are designed to avoid the Restricted Bands of Operation outlines in the Electronic Code of Federal Regulations, Title 47 (Telecommunication), Part 15 (Radio Frequency Devices), Subpart C Intentional Radiators. We are requesting frequencies up to 28 MHz at the FCC’s discretion and guidance. Listed in the following Table (1a) are the requested proposed technical parameters for the experimental research program.

FCC Office of Engineering and Technology (OET) Page 3 Crossed Dipole (Signal) Transmit Antenna Transmitter Site Locations Transmitter Site #1 The MITRE Corporation 202 Burlington Road, Bedford, MA 01730 42-30-11.6N, 71-14-13.3W Crossed Dipole Antenna Radiation Center: 9.1 m AGL Crossed Dipole (signal) Transmit Antenna Azimuth Orientation: omnidirectional Crossed Dipole (signal) Transmit Antenna Vertical Plane Orientation: 90 degrees (120 Deg beamwidth) Transmitter Site #2 1501 Channingway Drive, Fairborn, OH, 45324 39-47-27.3N, 83-59-58.3W Crossed Dipole Antenna Radiation Center: 10.6 meters AGL (4.6 m building + 6 m antenna mast) Transmitter Site #3 1155 Academy Park Loop, Colorado Springs, CO, 80910 38-48-59N, 104-45-38W Crossed Dipole Antenna Radiation Center: 10.6 meters AGL (4.6 m building + 6 m antenna mast) Transmitter Site #4 5251 Burleson Road, Oneida, NY 13421 43-01-45.3N, 75-39-4.1W Antenna Configuration same as Transmitter Site # 1 Transmitter Site #5 7515 Colshire Drive, McLean, VA, 22102 38-55-25N, 77-12-21W Crossed Dipole Antenna Radiation Center: 51.8 meters AGL (45.8 m building + 6 m antenna mast) 2505.0 - 4100.0, 4210.0 - 4995.0,5005.0 - 6210.0, 6320.0 - 8250.0, 8450.0 - 9995.0, 10005.0 - Requested Frequency ranges (kHz) 12200.0, 13500.0 - 14990.0, 15010.0 - 16000.0, 16000.0 - 19995.0, 20005 - 28000.0 Maximum Transmit Power 200 Watts (average varies between 20 and 200 Watts) Transmitter Ettus USRP N210 Software Defined Radio Transmitting Antenna MITRE-built Crossed-Dipole (see Figure 1a) Broadband bow-tie shaped, inverted vee-dipoles with resistive loading Small Footprint (< 30 meter diameter) Dipoles are arranged orthogonally on mast to produce x-,y- polarizations 1 MHz (typically vary from 50 kHz up to 400 kHz) ** 1 MHz is a stretch goal and will be done on a Maximum Occupied Bandwidth not-to-intefere basis. Most work will be done around 100-300 kHz. Experiments may run for 24 hours several times per month, shorter times up to half time during a Maximum Transmit Time Duration (Duty) month (hours). Duty cycle is up to 100% during experiments. Table 1a. Proposed Experimental Crossed-Dipole Transmission Parameters There are five requested transmit locations listed in Table (1a) above, two of which (Transmitter Sites 1 and 4) are part of the current FCC license 0162-EX-PL-2014 that was recently submitted for renewal. There are three new sites requested for authorization, Transmitter sites 2,3, and 5. Our team performed the obstruction evaluation test required by the FAA. Those analyses are in process. The FAA Obstruction Evaluation team assigns Aeronautical Study Numbers to each individual case, the active case numbers are as follows: Transmitter Site 1 ASN = 2016-ANE-3398-OE (Bedford, MA) Transmitter Site 2 ASN = 2016-AGL-12038-OE (Fairborn, OH) Transmitter Site 3 ASN = 2016-ANM-2667-OE (Colorado Springs, CO) Transmitter Site 4 ASN = 2016-AEA-8029-OE (Oneida, NY) Transmitter Site 5 ASN = 2016-AEA-8030-OE (McLean, VA)

FCC Office of Engineering and Technology (OET) Page 4 The MITRE-developed Crossed-Dipole antenna configuration and dimensions are shown in Figure 1a below. Figure 1a. Model Crossed Dipole Antenna (< 30m diameter) The system supports two orthogonal polarizations: two inverted vee-dipoles (x-, y-polarized). The antenna elements are well matched over 6-11 MHz to 50 ohms and offset to avoid mutual coupling effects. The antennas exhibit omnidirectional antenna patterns with an antenna gain of 2 dBi between 2.5 and 28 MHz. The system is simple, low-cost and MITRE-fabricated, - assembled, and –setup. While MITRE fabricated the antennas and designed the transmit and receive systems, some of the equipment was purchased from commercial vendors. Table 2 shows a list of the commercially purchased equipment that will be used during the experiment(s). Table 2. Commercially purchased transmission equipment list. Transmitting Equipment Manufacturer Model Number No. of Units Experimental (Y/N) Ettus USRP N210 10 (5 sites x 2 radios) N AR Modular RF Amplifiers KMA2040M22 10 (5 sites x 2 radios) N Research and Experimentation Contribution to the Development of the Radio Art Assured beyond line-of-sight communications is a challenging problem yet essential for certain types of communication. Fortunately, HF technology is uniquely suited to address this problem, applying new techniques and understanding of the ionosphere. With HF, BLOS communications is achievable without the use of satellites or psuedo-lites. The traditionally low data rates can be

FCC Office of Engineering and Technology (OET) Page 5 improved upon as well. In today's economic climate, HF is very affordable, with a well- established commercial market. MITRE's work will demonstrate a new approach to addressing critical communications capability shortfalls through the application of polarization diversity and advanced orthogonal coding designs. If there are any technical questions with the proposed application, please contact one of the undersigned. Maureen Scheible The MITRE Corporation 26 Electronic Parkway Rome, NY 13441 September 12, 2016 Lucien Teig The MITRE Corporation 202 Burlington Road Bedford, MA 01730 September 12, 2016


Document Created: 2016-09-12 19:30:13
Document Modified: 2016-09-12 19:30:13
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC