Bluetooth negative view of: Ruan help autumn Published: 2001/01/16
Thesis:
The Bluetooth technology has been popular in just two years in just two years. Monaco Bluetooth 2000 conference invested that equipment using Bluetooth technology within two years will reach 50 million, and the production of blue bud equipment will exceed 1.4 billion to 2005. So, is Bluetooth really perfect? Let us look at the shortcomings of Bluetooth from the reverse opinions of Bluetooth.
text:
Bluetooth technology
Today's wireless technology day is different, third-generation mobile communication technology, mobile Internet WAP technology and Bluetooth technology have gradually become the focus of the world's attention. Bluetooth technology is an open global specification for wireless data and voice communication. It is based on low-cost close-to-wireless connection that establishes a special connection for the communication environment of the mobile device. Thereby, a network around a person has enabled various information-based mobile portable devices within 10m of its standard to seamlessly implement resource sharing. The Bluetooth technology has been popular in just two years in just two years. At present, continuous 2164 companies have also accepted the SIG (Special Interest Group), engaged in the development of SIG (Special Interest Group), engaged in the development of Bluetooth technology, and launched Bluetooth chips, Bluetooth protocols, applications, test equipment, etc. product. Monaco Bluetooth 2000 conference invested that equipment using Bluetooth technology within two years will reach 50 million, and the production of blue bud equipment will exceed 1.4 billion to 2005. So, is Bluetooth really perfect? Let us look at the shortcomings of Bluetooth from the reverse opinions of Bluetooth. Technology is not the most advanced Bluetooth technology, some are not currently the most advanced technologies in this field, such as error correction coding, and blue buds use 1/3 rate repetition code, 2/3 rate Hamming code or not used Error correction coding, without using the same coding rate, Turbo code, or other more advanced encoding mode. As a user, the more advanced the techniques used by the products that have been used, and the most advanced technology will bring a broad manner in the case of the cost of the standard realizes and product producers. Market and huge benefits. The anti-interference ability is not strong Sony in the Japanese Wireless Exhibition on-site, Bluetooth and IEEE802.11b and microwave interference experiments. The results show that when using wireless LANs and microwaves, the mesh pattern (Eye Pattern) has undergone obvious confusion. The company's person in charge explained that "in the case of no interference, the data transfer speed is 500 ~ 600kb / s. Once the microwave oven is used, the data transfer speed drops to 300kb / s due to the emergence of interference, and then use the corresponding IEEE802. .11b Specific wireless LAN, due to the increase in interference, the data transfer speed will drop sharply to 100 ~ 200kb / s. "Only, the data transfer has not been completely stopped. In fact, the Bluetooth communication network is often used in a use environment. This experiment is also carried out within the normal communication range of Bluetooth (within 10 meters). It is more difficult to imagine that communication outside the 10 meters is more difficult. Ecological security suspicious security issues include information security and ecological security. Information security issues are more emphasized in the software protocol stack. OEM (Original Equipment Manufacturer) manufacturers want to know the safety requirements in special applications (such as business, defense, etc.) so as to solve it by software engineers. Ecological security issues refers to whether there is a harm when the Bluetooth device is close to the human body. The cellular phone industry has been discussing over this issue for many years, but research has not been able to prove whether it is truly harmful, and cannot give a harmful basis. Inevitably, the problem of blue buds is mainly due to the same frequency range like Bluetooth and microwave, and there is still no consequences. Some organizations believe that Bluetooth output power is small (only 1MW), which is one hundred thousand parts of the use of the microwave, which is a small part of the mobile phone. In these outputs, there is only a small portion of the object to be absorbed, which is not increased at all.
