|
|
|
 |
 |
|
| Intel® Centrino® Wi-Fi Products |
| What are the different Wi-Fi protocols and data rates? |
|
 |
|
|
IEEE* 802.11 Wi-Fi protocol summary
|
Protocol |
Frequency |
Signal |
Maximum Data Rate |
|
Legacy 802.11 |
2.4 GHz |
FHSS or DSSS |
2 Mbps |
|
802.11a |
5 GHz |
OFDM |
54 Mbps |
|
802.11b |
2.4 GHz |
HR-DSSS |
11 Mbps |
|
802.11g |
2.4 GHz |
OFDM |
54 Mbps |
|
802.11n |
2.4 or 5 GHz |
OFDM |
600 Mbps (theoretical) | |
Legacy 802.11
- Released in 1997
- Two raw data rates of 1 and 2 Mbps
- Frequency hopping spread spectrum (FHSS) or direct-sequence spread spectrum (DSSS)
- Three non-overlapping channels in industrial, scientific, medical (ISM) frequency band at 2.4 GHz
- Originally defined carrier sense multiple access with collision avoidance (CSMA-CA)
802.11a
- Released in 1999
- Data rates with varying modulation types: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps
- Orthogonal frequency-division multiplexing (OFDM) with 52 sub-carrier channels
- 12 non-overlapping unlicensed national information infrastructure (UNII) channels in 5 GHz frequency band
802.11b
- Released in 1999
- Data rates with varying modulation types: 1, 2, 5.5 and 11 Mbps
- High-rate direct-sequence spread spectrum (HR-DSSS)
- Three non-overlapping channels in industrial, scientific, medical (ISM) frequency band at 2.4 GHz
802.11g
- Released in 2003
- Data rates with varying modulation types: 6, 9, 12, 18, 24, 36, 48 and 54 Mbps; can revert to 1, 2, 5.5, and 11 Mbps using DSSS and CCK
- Orthogonal frequency-division multiplexing (OFDM) with 52 sub-carrier channels; backwards compatible with 802.11b using DSSS and CCK
- Three non-overlapping channels in industrial, scientific, medical (ISM) frequency band at 2.4 GHz
802.11n
- Data rates with varying modulation types: 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbps; see table below
- Orthogonal frequency-division multiplexing (OFDM) using multiple-input/multiple-output (MIMO) and channel bonding (CB)
- Three non-overlapping channels in industrial, scientific, medical (ISM) frequency band at 2.4 GHz
- 12 non-overlapping unlicensed national information infrastructure (UNII) channels in 5 GHz frequency band with and without CB
| Note |
Channel bonding is recommended for the 5GHz because there are a limited number of non-overlapping channels available in the 2.4GHz band. | |
|
Mode |
Maximum Rate (Mbps) |
Antenna Transmit/Receive Arrangements |
|
Legacy a/b/g with antenna
diversity and CB |
121.5 |
1 Tx
1 Rx |
|
2x2 20MHz |
130 |
2 Tx
2 Rx |
|
2x3 20MHz |
144.44 |
2 Tx
3 Rx |
|
2x2 40MHz |
270 |
2 Tx
2 Rx |
|
2x3 40MHz |
300 |
2 Tx
3 Rx |
|
3x3 20MHz |
405 |
3 Tx
3 Rx |
|
3x3 40MHz |
450 |
3 Tx
3 Rx | |
This applies to:
|
|
|
|
Solution ID: CS-025321
Date Created: 27-Dec-2006
Last Modified: 30-Nov-2011
|
|
