Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY)
specifications.
The 802.11 family define a Wireless Local Area Network [WLAN]
using the Ethernet protocol, using Carrier Sense, Multiple Access with
Collision Avoidance (CSMA_CA). The 802.11 wireless LAN standards
provide a number of channels within each frequency band, and a number of
data rates. The highest data rate is listed below. The 802.11 standard
also specified infrared [IR], but I think the IrDA standard was more widely used.
Frequency-Hopping Spread Spectrum [FHSS], or direct sequence Spread
Spectrum [DSSS] are specified. 802.11 specifies a LAN with a minimum of
two stations.
802.11a [Wi-Fi] transmit at a frequency of 5 GHz with data
rates of 54 Mbps using Orthogonal Frequency Division Multiplexing
[OFDM].
802.11b [Wi-Fi]
transmit at a frequency of 2.4 GHz with data rates of 11 Mbps using
direct sequence spread spectrum modulation [DSSS].
802.11g transmit at a
frequency of 2.4 GHz with data rates of 54Mbps {OFDM, DSSS]. IEEE 802.11b
and 802.11g are compatible, devices can coexist in the same
network.
802.11h transmit at a frequency of 5GHz with data rates of
100Mbps. IEEE 802.11b and 802.11g are compatible so devices can coexist
in the same network
802.11n transmit at a
frequency of 2.4GHz or 5 GHz with data rates of 600Mbps. IEEE 802.11b and
802.11g are compatible, devices can coexist in the same network.
802.15 [ZigBee] transmit at a
frequency of 915MHz, or 2.4GHz.
Wibree Transmit at a
frequency of 2.4GHz out to 10 meters.
ZigBee transmit at a
frequency of 915MHz, or 2.4GHz.
Z-Wave transmit at a
frequency of 915MHz [908MHz], the same bands as ZigBee.
The 2.4GHz band is part of the ISM [Industrial, Scientific, and Medical] license-free radio bands [see below]. Both 802.11 and Bluetooth operate with in the band. Additional frequencies of the ISM band include the 900MHz band, and 5.8GHz band
The 802.15 family define a Wireless Personal Area Network [WPAN] for portable and mobile computing devices.
The 802.16 family define a line-of-sight 10GHz to 66GHz
metropolitan-sized network, with data rates of 120Mbps. IEEE 802: Air
Interface for Fixed Broadband Wireless Access Systems. 802.16a defines a
non-line-of-site network to support a local mesh architecture. 802.16d
[WiMAX] cover distances of up to 30 miles being used as the wireless
backhaul. 802.16e specifies mobile air interfaces for wireless broadband
in the licensed bands ranging from 2 to 6 GHz.
The European Union has allocated WiMAX spectrum frequencies of 3.4- to
3.6-GHz. The U.S has assigned the 2.5- to 2.7-GHz range, in addition to
the 3.65- to 3.7-GHz range. In Korea, WiBro uses a 2.3- to 2.4-GHz
bandwidth, and China has assigned the 3.3- to 3.4-GHz band to the
technology.
Chart of US Frequency Allocations *.pdf {NTIA}
Companies which manufacture Wireless ICs are listed on the RF Components page
For reference the IEEE 802.xx Family of standards are listed below:
IEEE 802.1 Higher layer LAN protocols
IEEE 802.2 Logical link control
IEEE 802.3 Ethernet, listed on its own page.
IEEE 802.4 Token bus
IEEE 802.5 Token Ring, used FDDI, listed on
its own page.
IEEE 802.6 metropolitan area networks
IEEE 802.7 broadband
IEEE 802.8 fiber optic
IEEE 802.9 isochronous LAN
IEEE 802.10 Security
IEEE 802.11 Wireless LAN [ISO/IEC 8802-11]
IEEE 802.12 demand priority
IEEE 802.13 (not used)
IEEE 802.14 Cable modems (No longer active), standards for data
transport over traditional cable TV networks.
IEEE 802.15 Wireless PAN [Personal Area Networks]
IEEE 802.16 Broadband wireless access
IEEE 802.17 Resilient packet ring
IEEE 802.20 Mobile Broadband Wireless Access
listed on the Bluetooth page
listed on the IrDA page
ISM Bands, [Industrial, Scientific, and Medical], license-free
radio bands
6780 kHz ±15.0 kHz
13560 kHz ±17.0 kHz
27120 kHz ±163.0 kHz
40.68 MHz ±20.0 kHz
915 MHz ±13.0 MHz
2450 MHz ±50.0 MHz
5800 MHz ±75.0 MHz
24.125 GHz ±125.0 MHz
61.25 GHz ±250.0 MHz
122.5 GHz ±500.0 MHz
245 GHz ±1.0 GHz
Definitions:
BWA: Broadband wireless access
LOS: Line-of-Sight
NLOS: Non-Line-of-Sight
WEP: Wired Equivalent Privacy
WPA: Wi-Fi Protected Access
Engineering Design Key words: Ad hoc network, Air, Radio, Wireless Ethernet, 802.11, Wireless Local Area Networks, WEP, OFDM, AES, Wireless LANs, Wireless Personal Area Networks, Wireless PANs, WiMax, Wireless Metropolitan Area Networks, Wireless MANs, Mobile, 802.11a/b/g/h, 802.15, 802.16, Metropolitan area network, MAN, CSMA/CD, Independent Basic Service Set, Station, Mobile, Portable.
|
|
|||||||
| Home | |||||||
|
|
|||||||
|
|
|
|
|
|
|
|
|
| Distributors | Components | Equipment | Software | Standards | Buses | Design | Reference |