But there is still a lot of dissatisfaction with WiFi and many of my clients tell me that most of the complaints they get about broadband connections are due to WiFi issues. These ISPs deliver fast broadband to the home only to see WiFi degrading the customer experience. But there are big changes coming with the next generation of WiFi that ought to improve the performance of home WiFi networks. The next generation of WiFi devices will be using the 802.11ax standard and we ought to start seeing devices using the standard by early 2019.
There are several significant changes in the 802.11ax standard that will improve the customer WiFi experience. First is the use of a wider spectrum channel at 160 MHz, which is four times larger than the channels used by 802.11ac. A bigger channel means that data can be delivered faster, which will solve many of the deficiencies of current WiFi home networks. This will improve the network performance using the brute strength approach of pushing more data through a connection faster.
But probably more significant is the use in 802.11ax of 4X4 MIMO (multiple input / multiple output) antennas. These new antennas will be combined with orthogonal frequency division multiple access (ODMFA). Together these new technologies will provide for multiple and separate data streams within a WiFi network. In layman’s terms think of the new technology as operating four separate WiFi networks simultaneously. By distributing the network load to separate channels the interference on any given channel will decrease.
Reducing interference is important because that’s the cause of a lot of the woes of current WiFi networks. The WiFi standard allows for unlimited access to a signal and every device within the range of a WiFi network has an equal opportunity to grab the WiFi network. It is this open sharing that lets us connect lots of different devices easily to a WiFi network.
But the sharing has a big downside. A WiFi network shares signals by shutting down when it gets more than one request for a signal. The network pauses for a short period of time and then bursts energy to the first network it notices when it reboots. In a busy WiFi environment the network stops and starts often causing the total throughput on the network to drop significantly.
But with four separate networks running at the same time there will be far fewer stops and starts and a user on any one channel should have a far better experience than today. Further, with the ODMFA technology the data from multiple devices can coexist better, meaning that a WiFi router can better handle more than one device at the same time, further reducing the negative impacts of completing signals. The technology lets the network smoothly mix signals from different devices to avoid network stops and starts.
The 802.11ax technology ought to greatly improve the home WiFi experience. It will have bigger channels, meaning it can send and receive data to WiFi connected devices faster. And it will use the MIMO antennas to make separate connections with devices to limit signal collision.
But 802.11ax is not the last WiFi improvement we will see. Japanese scientists have made recent breakthroughs in using what is called the TeraHertz range of frequency – spectrum greater than 300 GHz per second. They’ve used the 500 GHz band to create a 34 Gbps WiFi connection. Until now work in these higher frequencies have been troublesome because the transmission distances for data transmission has been limited to extremely short distances of a few centimeters.
But the scientists have created an 8-array antenna that they think can extent the practical reach of fast WiFi to as much as 30 feet – more than enough to create blazingly fast WiFi in a room. These frequencies will not pass through barriers and would require a small transmitter in each room. But the scientists believe the transmitters and receivers can be made small enough to fit on a chip – making it possible to affordably put the chips into any device including cell phones. Don’t expect multi-gigabit WiFi for a while. But it’s good to know that scientists are working a generation or two ahead on technologies that we will eventually want.