can coexist without mutual interference. Power limits subcarrier are also shown in Table 5.2-4. symbol symbol Extension of the data rates of 802.11b to those of 802.11 but on the 2.4 GHz band is covered in sup- plement 802.11g. The OFDM physical layer defined for the 5 GHz band is applied essentially unchanged to 2.4 GHz. Equipment complying with 802.11g must also have the lower-rate features and the CCK modulation technique of 802.11b SO that it will be downward com- patible with existing Wi-Fi systems. 16-QAM 16-QAM HIPERLAN/2 64-QAM While 802.11b was designed for compliance with regu- 64-QAM lations in the European Union and most other regions of Short-range wireless applications and technologies CHAPTER 5.2 5.2.2 Bluetooth Table 5.2-3 Channel allocations and maximum power for 802.11a in United States. There are two sources of the Bluetooth specification. Operation Channel Maximum One is the Bluetooth Special Interest Group (SIG). The channel center power with current version at this writing is Version 1.1. It is numbers frequencies up to 6 dBi arranged in two volumes-Core and Profiles. Volume 1, (MHz) antenna gain the core, describes the physical, or hardware radio characteristics of Bluetooth, as well as low-level software or firmware which serves as an interface between the U-NII lower band (5.15-5.25 GHz) radio and higher level specific user software. The profiles in Volume 2 detail protocols and procedures for several widely used applications. The other Bluetooth source U-NII middle band specification is IEEE 802.15.1. It is basically a rewriting (5.25-5.35 GHz) of the SIG core specification, made to fit the format of IEEE communications specifications in general. Bluetooth is an example of a wireless personal area U-NII upper band network (WPAN), as opposed to a wireless local area (5.725-5.825 GHz) network (WLAN). It's based on the creation of ad hoc, or temporary, on-the-fly connections between digital de- vices associated with an individual person and located in the vicinity of around ten meters from 