WLAN service method and WLAN system

摘要: BACKGROUNDFrequency diversity is one of the characteristics that should be considered in designing wireless communication systems, especially for ones that operate over a wide frequency band such as WiMAX and 3GPP LTE. In addition to spatial and temporal diversities, signals transmitted over a wide fre quency band experience independent fluctuations across fre quencies. This phenomenon is generally called “frequency selective fading. Frequency diversity is ignored in conven tional WiFi systems because these systems use a channel as a whole. However, adoption of OFDM in 802.11 WLANs trig gered recent research interests in harvesting gains from fre quency diversity. The importance of frequency diversity research becomes more important than ever as IEEE 802.11 working group (WG) is standardizing the use of wider chan nels. For example, 802.11 n can already use a 40 MHZ channel by Phased …