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Note any changes such as discontinuance of use of a frequency, or of a type
of emission or of a transmitter which have been made since the last application
covering this station was filed:
Location: Dallas (DALLAS), TX - NL 32-50-31; WL 96-46-38; MOBILE: Dallas, Texas - SMU Campus, within 50 km, centered around NL 32-50-31; WL 96-46-38
At this location, we are working on three relevant federally funded research projects: National Science Foundation Award#1823304 (Multi-Dimensional Drone Communications Infrastructure), Air Force Office of Scientific Research Award#FA9550-19-1-0375 (On-the-Fly Topological Formation of UAV Swarms), and National Science Foundation Award#1909381 (Many-Antenna Full-Duplex for Mobile and Multihop Topologies).
First, we would like to extend this license for the next 5 years to cover the research in these projects as well as make the following changes.
In these projects, we are moving towards using MIMO and massive MIMO systems to steer beams of connectivity to and from mobile receivers, especially mounted on drones. Hence, at this location, we are requesting additional power of 50 dBm or 100 W on TV white space channels 15 (476-482 MHz), 17 (488-494 MHz), and 28 (554-560 MHz). This transmission would be directional in nature where the following parameters would be used from Skylark Wireless hardware (IRIS):
Per Radio Power
26 dBm
Number of Radios
16
Number of Spatial Streams
16
Polarization
2
An alternative configuration could be used for an antenna array of 32 nodes, but the power budget will not exceed the 50 dBm/100 W numbers by making the following changes:
Per Radio Power
20 dBm
Number of Radios
32
Number of Spatial Streams
16
Polarization
2
Besides the aforementioned frequencies of TV white space channels 15, 17, and 26, no other power changes would be required for the other bands currently allowed.
The massive MIMO transmitter would be located across the street from the current location at 6116 N. Central Expressway on the southeast corner of the building. With GPS coordinates of 32°50'28.4N 96°46'27.5W (32.841222, -96.774317).
In addition, SMU has another campus in Taos, NM where we do a number of drone-based experiments on these sub-6 GHz frequencies. We would like to add the fixed location at 6580 NM-518, Ranchos De Taos, NM 87557, which has GPS coordinates of 36°16'18.4N 105°34'39.4W (36.271768, -105.577621), and a 10 km radius around this location for mobile transmitters for use by drones, vehicles, and pedestrians.
The Dallas location changes have been discussed with Johnny Stigler (214-236-0222, jstigler@swbell.net), who is the frequency coordinator for Dallas. Here is the following correspondence with him:
On May 22, 2020, at 4:52 PM, Johnny Stigler wrote:
Joe & I have spoken about his MIMO drone project.
I recommend the following in the TV Spectrum after repack:
Ch15 476-482MHz
Ch17 488-494MHz
Ch28 554-560MHz back up as a LP Digital may show up
Johnny Stigler
SBE 67 Freq Coord
214-236-0222
On May 22, 2020, at 3:15 PM, Camp, Joseph wrote:
Hi Mr. Stigler,
I talked to Skylark Wireless (https://www.skylarkwireless.com) and they gave me a link model to see what ERP their hardware would output. With 16 radios operating at 26 dBm, the maximum EIRP would be 50 dBm or 100 W. Please see the calculation below:
Massive MIMO Link Budget
Params
Down
Up
Notes
Per Radio Power
26 dBm
Assumes PAPR included
Number of Radios
16
Number of Spatial Streams
16
Polarization
2
Would this be something we could do on channel 15, 17, 26, or 28? We only need one channel.
-Joe
--
Joseph Camp
Associate Professor, SMU
Lyle School of Engineering (ECE)
http://lyle.smu.edu/~camp
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