【 Weak current College 】 wireless technology in the application of the intelligent home

Speaking of family information device, people first think of telephone, computer and TV, these traditional devices also have an identical characteristics, they are dragged behind a "tail": the phone behind the phone line; computer with twisted-pair cable; coaxial cable TV attached. Therefore, one must in the sofa, writing desk, and other fixed place using these devices.

Along with the living conditions and lifestyle changes, information devices use the heightened needs: indoors to move the use of terminal equipment, to be able to select different places or even the use of terminal equipment on the bed; reduce indoor all wiring, to avoid breaking the wall or cable chaos as Ma. And wireless technology in the application of the family meets the needs of the people.

This article from wireless technology, wireless terminal products and wireless application model three paper wireless technology in the application of the family. Wireless technology
Now wireless access standard, used mainly for indoor access WLAN (wireless LAN), Bluetooth (Bluetooth), indoor digital cordless technology and is studying of UWB (ultra wide band).
1.WLAN
The current popular WLAN standards include a IEEE802.11b/g/.
（1）IEEE802.11b。 Work at 2.4GHz band, the physical layer support 5.5Mbit/s and 11Mbit/s two rate. It's the transfer rate can environmental interference or transmission distance, the 11Mbit/s, 5.5Mbit/s, 2Mbit/s, 1Mbit/s conversion between that can meet the daily needs of the transport.
（2）IEEE802.11a。 Work at 5.8GHz band, at up to 54Mbit/s, fully meet the voice, data and video services. IEEE802.11a and IEEE802.11b compliant.
（3）IEEE802.11g。 Work at 2.4GHz band, at up to 54Mbit/s, and fully compatible with IEEE802.11b. However, because standard IEEE802.11g, so just came out, now the real product is relatively rare. 2.Bluetooth
Bluetooth standard by the IEEE custom, is a high-capacity short distance wireless digital communications technology standard, a maximum data transfer rate of 1Mbit/s, the effective transfer rate 721kbit/s, the maximum transmission distance of 10m. Bluetooth over WLAN more mobility and low cost, small size, can be used to more devices. 3. indoor digital cordless
Domestic implementation of indoor digital cordless technology work to 2.4GHz band, need equipment for effective radiated power of not more than 10mW. Indoor digital cordless technology low cost, easy to implement. 4.UWB
UWB original applied to United States military areas, 2002 was United States FCC (Federal Communications Commission) the lifting of the ban, allowing access to civilian areas, now users do not have to apply for. FCC rules applied to the civilian areas of UWB work in 3.1 ~ 10.6GHz band, transmitting power is smaller than 1mW, therefore its range within the 10m. UWB technology has three major characteristics:
(1) up to several hundred Mbit/s high speed communication;
(2) of the electricity consumption of existing wireless technologies below 1%;
(3) than the existing wireless technology to lower costs.
These characteristics make them particularly suitable for intensive indoor multipath places for high-speed wireless access applications. Among the many wireless access technology, some technical overlap each other, some technologies cover, then the family is what kind of technology or which technologies, according to the technical development and specific application to make a decision. Wireless Terminal products
The family of wireless terminal equipment, in addition to the common PC, cordless "e" phone home, plus, more PDA, dual mode phone together with the information home appliances and other smart devices.
1.PC
In recent years, the number of households with PC in the rapidly growing through wireless access (generally use WLAN mode), it can in the living room, den, bedroom, etc. from anywhere using a PC, for a variety of data and video services. 2.PDA
As a handheld device, PDA technologies evolve and improve, in indoor use of WLAN and Bluetooth technology to achieve products access to the Internet, email, to receive real-time information and watch video on demand, data and video services, mainly in the data service. 3. dual mode phone
Outdoor use GSM or CDMA technology, indoors valid range is automatically converted to Bluetooth or WLAN mode. Dual-mode mobile phone as a fixed telephone and mobile phone in the home, for voice and data services.

4. the information appliance
Including refrigerators, washing machines, TVs and microwave ovens and other equipment, these devices through Bluetooth or WLAN or a private agreement and family control terminal equipment connected to the control terminal will be able to surf the Internet, send and receive E-mail, but also by mobile phone or PC remote control. More have a noteworthy home appliances: TV, its set-top boxes and Internet connected for multimedia services.

5. smart device
Home smart terminal for Windows and doors, lighting and curtains, etc. The family of wireless terminal can have many kind, when the device is more and more, using the same frequency bands of different technical interference exists, then, requires unified consideration of networking between devices. This is now the industry is very concerned about a problem. Wireless at home application mode
The family tradition of wireless applications mainly in the infrared control and cordless phone, etc, but with the development of telecommunications technology, together with the communication equipment, information appliance and smart device progress, simple, flexible and reliable wireless home networking needsGrowing. At the same time, some manufacturers have also launched the network of family, digital home concept. Manufacturers to provide users of digital home products will have the people and housing interactive, family devices, people and information interchange and other features, these features and wireless together, form a wireless home network to meet the user information, entertainment, communications, home environment, allowing users to experience the high quality of life. Wireless home network topology diagram shown in Figure 1, the core of the system as a central control device, function including GATEWAY, AP, central processing; peripherals including communications equipment, recreational equipment, home appliances, household equipment and other household information in almost any device.

Therefore, the wireless technology in the application of the family is also capable of the following areas to:
1. wireless communications
Now, it's not only through mobile phones, cordless phones for traditional voice calls, but also through the PC, dialed Visual devices, video phone, there is also capable of sending text messages, E-mail and online chat, and person communications.
2. Wireless Entertainment
Consumers can watch TV with the bedroom from the living room of DVD playback of movies, enjoy with living room stereo PC Download online music, and mobile phones and PDAs are automatically and home made music storage connected to the CD. 3. wireless information
Not only in the study used information terminal equipment, bedroom, living room, or even on the balcony is also able to surf and download information. Through intelligent control device wireless control air conditioning, refrigerator, washing machine, microwave oven, and other home appliances almost any device. For example: start air conditioning at the temperature of the family mediation; refrigerator which also has the ability to eat food, which is out of warranty, what food is not enough to buy; clothing immersed for hours, a few hours, how exactly do you get up and drying can wear; microwave heating of foods to what degree the most delicious, when to start heating to just catch up with you after brushing teeth to eat ...

4. wireless home environment
In the early morning when the sun shines in your room, the music will you wake up from sleep, the curtain open, start a kitchen oven. Eat breakfast, while listening to the Internet tailored to the morning news. Central to the community service orders, provide one day needed supplies. Out the door, the home device automatically shut off, security monitoring system startup. Wireless home network almost covers any information within the family unit, users can choose according to your needs in many wireless applications.

Of course, now the wireless access technologies exist for stability, reliability, security, price, and so on, but wireless into family is the trend, as the technology development and terminal equipment prices down, people will be more choice of wireless devices, the freedom, convenience, comfort and enjoyment of life, which is in line with the concept of modern life. We look forward to, infinite (wireless) for a better tomorrow.