Monday, March 29, 2010

wireless communication technology

Zigbee is a new bidirectional wireless communication technology. It is based on the IEEE 802.15.4 wireless standard with some significant advantages such as Lacoste Polo Shirts close-transmission, low-complexity, low-cost, low data rate and so on compared with other wireless standard. Zigbee is suitable for businesses with small data traffic and it can support small-scale-based wireless communications, control and automation.Compared to common wireless communication standards, Zigbee protocol is compact and simple. It is easy to achieve specific Lacoste Polo Shirts requirements. Zigbee protocol is made by both IEEE 802.15.4 and Zigbee Union, including physical layer, data link layer, network layer, application layer. The cooperation of each level can ensure the Lacoste Shirts normal transmission of informationThe biggest drawback of Zigbee is that nodes have very limited energy, storage space and computing ability. Nodes are usually randomly arranged in a complex Cheap Lacoste Polo Shirts environment and low cost may bring the possibility of energy shortage. Largescale data acquisition may bring the danger of congestion in the condition of limited hardware cheap nike shoes limits, cause large consumptions of nodes or even network paralysis. These problems make the reliability of data transmissions in Zigbee network under great restriction.
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