New Spectrum Issues

Development of 8K UHDTV Wireless Camera Using Millimeter-Wave Band - $15

Wireless cameras have enabled dynamic shooting, making them indispensable in television program production of sporting events and music concerts. NHK has developed an 80-Mbps-class high-definition television (HDTV) wireless camera through orthogonal frequency division multiplexing (OFDM) using millimeter waves in the 42-GHz band for producing various programs. The broadcasting of 4K and 8K ultra-high-definition
television (UHDTV) through satellites started in Japan in 2018, increasing the demand for the realization of ultra-high-quality imaging through 4K and 8K wireless cameras. Thus, we have attempted to increase the transmission capacity to construct an 8K wireless camera using millimeter-waves, while maintaining a small size and light weight.

We developed an 8K UHDTV wireless camera system using millimeter-waves that can be portable. For the first time in the world, we succeeded in transmitting 185-Mbps 8K UHDTV signals as a wireless camera through wireless transmission experiments. We prototyped a compact transmitter with a single-carrier transmission with frequency domain equalization (SC-FDE) that is more robust than OFDM for
power-amplifier distortion and is superior in terms of power efficiency. Then, the 8K UHDTV wireless camera system was constructed by combining the transmitter with a portable video encoder.?In this presentation, we
introduce the prototype 8K UHDTV wireless camera system using millimeter-waves and report the results of laboratory and field wireless transmission experiments. In this study, we firstly realized the portable 8K UHDTV wireless camera prototype system in the world, toward an 8K wireless camera that can wirelessly transmit ultra-high-definition 8K camera video with ultra-low delay.

Yoshifumi Matsusaki | NHK (Japan Broadcasting Corporation) | Tokyo, Japan
Fumiya Yamagishi | NHK (Japan Broadcasting Corporation) | Tokyo, Japan
Tomohiro Shimazaki | NHK (Japan Broadcasting Corporation) | Tokyo, Japan
Fumito Ito | NHK (Japan Broadcasting Corporation) | Tokyo, Japan
Takayuki Nakagawa | NHK (Japan Broadcasting Corporation) | Tokyo, Japan
Naohiko Iai | NHK (Japan Broadcasting Corporation) | Tokyo, Japan

FM 8th Harmonic Interference to a Cellular Service Not Caused by an FM Station: A Case Study - $15

It is well-known?that 7th and 8th harmonic FM broadcast emissions have been a source of contention between cellular carriers and FM stations. Such harmonics are rarely radiated from the broadcast antenna itself. Usually, the cabinet radiation of the FM transmitter is seen as the culprit, even if the cabinet radiation is within the Part 15 specifications. In a special case, the proximity of the FM and cellular antennas can create?an overload situation where the cellular carrier generates?its own interference. A station in Massachusetts was accused of causing 8th harmonic interference and the carrier involved the FCC in the matter. A methodical approach had to be taken to eliminate the assumed causes of the interference and implicate the carrier’s internal receiver overload mechanism as the cause. This paper is a case study of that complaint.?It shows how the possible causes had to?be unpacked to satisfy the complainant and the FCC that the FM station was not the primary cause. The various mechanisms for generating 8th harmonic energy are explored. The?calculations and measurements required to exonerate the FM station are presented.?

David Maxson | Isotrope, LLC | Medfield, Massachusetts, USA

Wireless Microphone Operation for Mega-Events in the 1425-1525 MHz Band - $15

Due to the repurpossing of the 600 MHz band that is scheduled to be completed in July 2020, the alternate 1435 – 1525 MHz band will be more heavily used by broadcasters for wireless microphones to cover mega-events such as the Superbowl, World Series, Kentucky Derby, national elections, the Academy Awards, etc. This band has been used for wireless microphones through the use of special temporay authorization (STA) granted by the FCC. This procedure will effectively by normalized through an approval process with the Aerospace and Flight Test Radio Coordinating Council (?AFTRCC?), the agency that coordinates aeronautical mobile telemetry (i.e. flight training), the primary service in this band. Wireless microphone equipment must incorporate location, date, and time awareness. AFTRCC will provide a digital code (i.e. an electronic key) that will unlock the equipment, enabling it to work at the approved time and location. This paper and presentation will detail the regulations, eligilibity, and procedure for operating wireless microphones in this frequency band.

Ciaudelli | SENNHEISER Research & Innovation | Old Lyme, CT USA