At present, Wi-Fi generally uses two frequency bands, 2.4GHz and 5GHz respectively. The low frequency corresponds to a small bandwidth, and each frequency band has fewer channels, and most of the better channels are TV, satellite, etc. The function is occupied, the number of channels reserved for Wi-Fi technology is small, and the quality is not the best.
What's different about 60GHz is that it's a band that hasn't been used by Wi-Fi and other mainstream consumer electronics devices. This band has a lot of resources available. Since its frequency is much higher than 2.4 GHz and 5 GHz, the channel is wider and the available channel width is nearly 50 times higher than IEEE 802.11n (a type of existing Wi-Fi technology). The direct result of this is a significant increase in data transfer rates.
Wi-Fi was born in 2000, when the data transmission rate was only 11 m / sec. Today, 15 years later, the theoretical value of data transmission rate for ordinary Wi-Fi has reached 1.3G/sec. This technology, known as 11ad by Qualcomm, can increase this value to 7G/sec, which is enough for a larger 4K movie to wirelessly transfer between devices and devices in a very short time.
“For example, a 10-lane highway can of course pass more vehicles than a bicycle road,†Mark Grodzinsky said.
In fact, the highway is not only because the road conditions are better, the speed of the car is faster, the design of the route is more clear, and the point-to-point mode also saves the time for the car to detour on the ordinary road. 11ad technology also has the advantage of transmitting signal beams to make signal transmissions more directional, even in dense network environments without interference from other signals.
This is different from the normal Wi-Fi technology that radiates signals in all directions. With 11ad technology, you don't have to refer to the tutorials provided in the circle of friends. You should put the router on the table in the middle of the home, and you need to meet the conditions of no books or other obstructions around to ensure the speed.
However, there is still some problem with this kind of transmission based on the 60 GHz band. The high frequency makes it not spread as widely as Wi-Fi, and there is no wall penetration like Wi-Fi, which allows wireless networks to be used in multiple rooms simultaneously. The family will encounter some difficulties.
Qualcomm's approach to Atheros is to solve this problem by using a tri-band Wi-Fi solution, which means that it can be integrated with existing Wi-Fi technology, and through the "fast scene transfer" (Fast Session) in areas not covered by 11ad. Transfer) technology enables seamless transitions between two bands without disrupting any running applications in the system.
The Wireless Gigabit Alliance (WiGig), jointly established by Microsoft, Dell, Samsung, Huawei, Intel, and Panasonic, is working to promote the industrialization of 11ad technology. This year, it will be a year of great results.
Dell has launched the ultra-thin LaTItude 6430u, which supports 11ad technology. Samsung plans to use the technology in mobile, medical and smart home products this year. Panasonic's SD card with this technology is also expected to be available this year, which enables DVD movies to be transferred in less than 1 minute without the need for cables.
In addition to 11ad technology, visible light communication technology may become another "substitute" for Wi-Fi.
As early as 2004, a professor at Keio University in Japan proposed the idea of ​​using a wide-ranging LED bulb as a base station for wireless transmission. In 2011, German physicist Harald Hass first demonstrated this technology called Li-Fi to TED Global. It transmits high-definition video signals through a single LED bulb, and when Hass blocks the light with his hand, the HD video being played on the big screen is abruptly stopped. Even in China, the School of Information Science and Engineering at Fudan University is conducting research and development of similar technologies.
Li-Fi technology is implemented by a microchip mounted on an LED lamp. The microchip controls the LED to flash millions of times per second. The light is on or the light intensity is 1, the light is off or the light is dark. In this way, the binary data is encoded into a light signal. Although the human eye cannot detect such a weak and rapid light change, it can be sensed by the photosensitive sensor and decoded by a special receiving device installed on the terminal device. Achieve signal transmission.
Some researchers said that they hope that in the next 25 years, people can use the "bulb" mobile phone to access the Internet. This low-radiation, low-cost, fast signal transmission technology may also be used in the field of car networking. For example, through the transmission of signals from the front and rear lights, the vehicle and the vehicle on the road, and between the vehicle and the signal light can be “communicated†without using other devices.
However, Li-Fi technology also has drawbacks. Since it only has a downlink channel and no uplink channel, it means that its terminal device can only receive information and cannot return information to the LED bulb. In addition, when someone passes the light, it will break the net.
Like the 11ad technology, Li-Fi does not completely replace the existing wireless communication technology, but will complement Wi-Fi technology in the future. Therefore, in the foreseeable future, the "everything" network in the home may be realized through a combination of various technologies - such as traditional Wi-Fi, and then a light.
More exciting actually in the Shenzhen Huaqiang North - WIFI / Bluetooth Technology Salon Conference on 3.21
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