ATSC 1.0 botched OTA making antenna reception difficult and a black magic art. ATSC 3.0 promises to make OTA reception easier:
"The antenna can be tiny.
With a big enough antenna installed high enough on your roof, you can pull TV signals from more than 60 miles away.
The problem is, the average person doesn’t want to install an outdoor antenna and snake cable to all of the television sets in their house. ATSC 3.0 changes that.
While logistics of the antenna aren’t finalized by any means, industry leaders have floated the idea of a small antenna that would plug into the back of a television either through an HDMI or USB port. Wouldn’t that be convenient?
It’s much easier to sell a consumer on a gadget that you plug into a port and automatically receive local channels for free after tuning the TV than convincing them to buy an antenna, find the perfect position for it and hide the cords."
LG has demoed an ATSC 3.0 antenna that has wifi capabilities embedded:
“LAS VEGAS, April 18, 2016 - LG Electronics today demonstrated a unique new wireless network antenna designed to receive and process ATSC 3.0 next-generation television broadcast signals and redistribute them via WiFi throughout the home to connected devices such as smart TVs, tablets, laptop computers and smartphones.”
The only thing I can figure is that they could broadcast similar to cell phones. Lots of low power towers all over the place with IP packet radio (sort of). I’m afraid that those of us out in the boonies will lose out (again).
"To account for this major shift, the ATSC standards body had to rethink the very notion of broadcast reception. At the physical layer of ATSC 1.0, there was only one operating point. In lay terms, back with ATSC 1.0 broadcasts were strictly targeted to rooftop antennas, not to mobile devices (there were no multimedia-capable mobile devices in the early days of ATSC 1.0).
However, in and around the ATSC 2.0 time period, there was the introduction of ATSC Mobile. ATSC Mobile added these operating points so that you could add more levels of robustness to target mobile devices. More robustness, however, means less packets and lower quality. That’s unacceptable with today’s higher resolution devices.
In ATSC 3.0 that’s all changed for the better. Now, there will be a huge range of operating points from the rooftop antenna mobile all the way down to the operating point where the signal is 3db less than noise. In other words, you could potentially watch TV in a tunnel.
There is deliberately such huge range of operating points in the new standard so that the broadcaster can choose what they want to do . The station can broadcast in multiple modes—over the air, mobile, and medium rate for HD tablets—all at the same time. The broadcaster is in control and can choose what they want to target.
To illustrate this point in practice, Rich related a quick story about a demonstration in Cleveland a few weeks ago. They took an old TV transmitter that had been used during the transition to HDTV. That transmitter had been dark for years. They then got an experimental license from the FCC and implemented one of the candidate proposals for the ATSC physical layer and put it on air to use as a proof of concept. The intent was to get real world programming and start transmitting.
They conducted a one day demo and were able to watch full HD programming while driving at 60mph on the highway in Cleveland and while driving around the urban canyons downtown. They then went into a basement and were able to watch a SD TV (while an ATSC 1.0 receiver showed only noise). Any programming anywhere on any device, how cool is that!"
The North American Broadcasters Association has an excellent overview of the ATSC 3.0 transmission spec, mission and purpose (see the document link below):
The Next Generation of Terrestrial Broadcasting
Point E. Hybrid transmission network possibilities should be considered.
• The traditional “high power, high tower” single transmitter approach of
broadcasting may need to be modified. While fully cellular network models
are probably cost prohibitive, a hybrid model of a central transmitter with a
small number of lower-power macro-cells to complete the service area
deserves consideration. The “macro-cells” could be either on-channel
repeaters or utilize different frequencies. Both have advantages and
disadvantages that should be considered.
• For antenna sites, it’s encouraging to look at a hybrid model – a large-power
centralized stick to cover the broad breadth, and then fill-in where necessary.
Perhaps there could be an alpha factor to blend the amount of a central
radiator versus the number of repeater sites.
• Coverage indoors would be improved by transmit diversity. This refers not
only to the strength, but also the directionality and orientation of the antenna.
Does anyone have any idea what the DRM capabilities in ATSC 3.0 will be used for? I have seen it mentioned/listed in specs in multiple sources but have not read anything about how it would be used in the real world. My fear would be that it could be used to prevent one from recording or to charge for OTA service in some way - but I have never heard anyone even suggest that this might be the case so I hope that is just my imagination getting the better of me.
ATSC 3.0’s multi-stream distribution facilities has interesting possibilities. If the OTA feed dies, an IP based stream can take over at the point of breakup. Multiple feed types OTA means the failure of one device at home (its feed) can be instantly replaced by a different device (and its associated feed). There should be less and less points of failure. This has interesting significance for DVRs… LG has demonstrated an ATSC 3.0 OTA antenna that distributes the OTA feed through wifi streams to multiple devices (sort of like an HDHomerun built into the antenna).
The ATSC 3.0 transmission scheme has implications for the channel repack. It also allows for a wider bandwidth than the current 6 mgz channel boundary with less interference. The repack will make the frequency spectrum more efficient with less gaps when the ATSC 3.0 architecture is used. In fact the channel repack assumes an eventual ATSC 3.0 transmission structure working hand in hand with it.
The Aereo antenna was that small because they relied on the fact they were setting them up very near (or pretty much ontop) of the broadcast towers on building rooftops) so a huge antenna wasnt required.
I am very skeptical of ATSC 3.0 working with an antenna of that size say 40 or even 60 miles out thru walls connected to an indoor device.
Thanks for educating me a bit on ATSC 3. I curious about the transmission infrastructure. The GatesAir seems to be geared towards updating the big central antenna platforms. Did I interpret that correctly or is there a move to network of smaller towers like cell phone networks?
It appears that its going to be a combination of centralized broadcast antennas and distributed transmittors (a la cellphone). ATSC 3.0 as a spec is meant to address both stationary and mobile video delivery. The word “hybrid” is used continuously throughout the ATSC 3.0 specs. That’s why there will be simultaneously multiple feeds and streams geared towards different device types, sizes and locations. So its a complete reconceptualization of OTA - not only for traditional stationary television sets but the whole range of video-enabled devices (from moving cellphones to tablets).
This changes the encoding as well so that it jibes with Internet technology and complements it (and vice versa).
What is astonishing is that we just went through a revolutionary phase a few years ago with the digital cutover…and now this…
This whole new approach will assuredly impact DVRs and their capabilities.