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802.11 Wireless Standards - CompTIA Network+ N10-006 - 5.3
802.11 Wireless Standards - CompTIA Network+ N10-006 - 5.3
Published: 2015/05/14
Channel: Professor Messer
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[Hindi/Urdu] WiFi Explained in Detail | Wifi 802.11 a, b, g, n, ac
[Hindi/Urdu] WiFi Explained in Detail | Wifi 802.11 a, b, g, n, ac
Published: 2016/01/04
Channel: Technical Guruji
BuyTV Spotlight - Trendnet 802.11G Wireless USB 2.0 adapter TEW-424UB
BuyTV Spotlight - Trendnet 802.11G Wireless USB 2.0 adapter TEW-424UB
Published: 2009/03/18
Channel: bluedonuts06
Details on 802.11g WiFi Access points
Details on 802.11g WiFi Access points
Published: 2010/05/09
Channel: ggdm
Damned 802.11g Bluetooth Wireless
Damned 802.11g Bluetooth Wireless
Published: 2007/10/25
Channel: jambalayajon
D-Link NetDefend 802.11G Wireless VPN Firewall 8, 4-Port 10/
D-Link NetDefend 802.11G Wireless VPN Firewall 8, 4-Port 10/
Published: 2009/09/15
Channel: Rakuten.com
WiFi Speed Test 802.11n vs 802.11g (Linksys Wireless-N Router)
WiFi Speed Test 802.11n vs 802.11g (Linksys Wireless-N Router)
Published: 2009/12/02
Channel: SimplyCali
2wire 802.11g USB Wireless Adapter Driver Download 98,2000,XP & Vista | twwgusb_2.3.1.3.exe
2wire 802.11g USB Wireless Adapter Driver Download 98,2000,XP & Vista | twwgusb_2.3.1.3.exe
Published: 2010/05/25
Channel: 855h0le
CSE574-16-06A: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 1 of 3)
CSE574-16-06A: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 1 of 3)
Published: 2016/10/04
Channel: Raj Jain
Wireless N vs Wireless G (NCIX Tech Tips #18)
Wireless N vs Wireless G (NCIX Tech Tips #18)
Published: 2008/10/29
Channel: NCIX Tech Tips
802.11g connection distracted by a 802.11n 40MHz connection
802.11g connection distracted by a 802.11n 40MHz connection
Published: 2013/08/31
Channel: Imre Szvorenyi
How to FIX - Xbox 360 Wireless N Only using 802.11g FIX
How to FIX - Xbox 360 Wireless N Only using 802.11g FIX
Published: 2011/07/27
Channel: Mike Maloney
CSE 574-14-06A: Wireless LANs Part II: IEEE 802.11a/b/g/n/ac (Part 1 of 2)
CSE 574-14-06A: Wireless LANs Part II: IEEE 802.11a/b/g/n/ac (Part 1 of 2)
Published: 2014/06/05
Channel: Raj Jain
CSE574-16-06B: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 2 of 3)
CSE574-16-06B: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 2 of 3)
Published: 2016/10/04
Channel: Raj Jain
How to Secure Wifi on DLink Di524 802.11g / 2.4 Ghz Wireless Router
How to Secure Wifi on DLink Di524 802.11g / 2.4 Ghz Wireless Router
Published: 2013/05/27
Channel: PhoneRadar
My New Base Station (Apple AirPort Extreme 802.11 G) Unboxing
My New Base Station (Apple AirPort Extreme 802.11 G) Unboxing
Published: 2016/11/04
Channel: ColeTech
ZyXel 802.11G Wireless Hotspot Gateway
ZyXel 802.11G Wireless Hotspot Gateway
Published: 2009/11/02
Channel: Rakuten.com
802.11g connection while microwave oven is operating
802.11g connection while microwave oven is operating
Published: 2013/08/30
Channel: Imre Szvorenyi
54M Wireless 802.11g PCI Network LAN Card Adapter  from Dinodirect.com
54M Wireless 802.11g PCI Network LAN Card Adapter from Dinodirect.com
Published: 2010/10/11
Channel: dinovideo1api2
Presentation Gateway 802.11G
Presentation Gateway 802.11G
Published: 2016/07/13
Channel: Adelaida Woodall
Linksys WGA54G 54Mbps 802.11g Wireless Bridge
Linksys WGA54G 54Mbps 802.11g Wireless Bridge
Published: 2007/10/12
Channel: TigerDirect
802.11g/b WLAN USB(2.0) Adapter Review
802.11g/b WLAN USB(2.0) Adapter Review
Published: 2017/10/24
Channel: John Smith
CSE 574-14-06B: Wireless LANs Part II: IEEE 802.11a/b/g/n/ac (Part 2 of 2)
CSE 574-14-06B: Wireless LANs Part II: IEEE 802.11a/b/g/n/ac (Part 2 of 2)
Published: 2014/06/05
Channel: Raj Jain
High Speed IEEE 802.11g 54M Wireless USB Network Adapter
High Speed IEEE 802.11g 54M Wireless USB Network Adapter
Published: 2010/02/11
Channel: dinodirectvideo
USB 802.11G 54M Wireless LAN Adapter High Power 500MW BL-LW02-H4  from Dinodirect.com
USB 802.11G 54M Wireless LAN Adapter High Power 500MW BL-LW02-H4 from Dinodirect.com
Published: 2010/09/07
Channel: dinovideo1api2
Is WiFi G Faster than B in Windows Mobile?
Is WiFi G Faster than B in Windows Mobile?
Published: 2007/11/30
Channel: Pocketnow
D-Link N150 802.11g/n 2.4GHz Wireless Router - DealExtreme
D-Link N150 802.11g/n 2.4GHz Wireless Router - DealExtreme
Published: 2012/03/01
Channel: DealeXtreme DV
How to Find Drivers for a 2Wire 802.11g Legacy PCMCIA Card from Austin Cyber Shop
How to Find Drivers for a 2Wire 802.11g Legacy PCMCIA Card from Austin Cyber Shop
Published: 2010/10/15
Channel: AustinCyberShop
Linksys Cisco WUSB54GC Wireless USB 802.11G Adapter V3
Linksys Cisco WUSB54GC Wireless USB 802.11G Adapter V3
Published: 2013/10/08
Channel: Ravetek
Wi-Fi | Курс "Компьютерные сети"
Wi-Fi | Курс "Компьютерные сети"
Published: 2016/10/30
Channel: Andrey Sozykin
Belkin Wireless G Router
Belkin Wireless G Router
Published: 2010/01/05
Channel: Rakuten.com
Belkin ME1001-USB Wireless USB 2.0 Adapter 802.11g
Belkin ME1001-USB Wireless USB 2.0 Adapter 802.11g
Published: 2009/10/07
Channel: DailyCheckout
54M Wireless 802.11g PCI Network LAN Card Adapter
54M Wireless 802.11g PCI Network LAN Card Adapter
Published: 2010/02/11
Channel: dinodirectvideo
54M Wireless 802.11g PCI Network LAN Card Adapter
54M Wireless 802.11g PCI Network LAN Card Adapter
Published: 2010/02/11
Channel: dinodirectvideo
High Speed IEEE 802.11g 54M Wireless USB Network Adapter
High Speed IEEE 802.11g 54M Wireless USB Network Adapter
Published: 2010/02/11
Channel: dinodirectvideo
Ubiquiti AirRouter AR 802.11g/n Wireless Router
Ubiquiti AirRouter AR 802.11g/n Wireless Router
Published: 2015/07/10
Channel: Flytec Computers
Get It Done !
Get It Done !
Published: 2017/10/29
Channel: Helping Tutor
Belkin Wireless G Plus MIMO Router 802.11g 54mb 2.4GHz - $90
Belkin Wireless G Plus MIMO Router 802.11g 54mb 2.4GHz - $90
Published: 2012/08/22
Channel: DealsOnRouters
CSE574-16-06C: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 3 of 3)
CSE574-16-06C: Wireless LANs Part II: 802.11a/b/g/n/ac (Part 3 of 3)
Published: 2016/10/04
Channel: Raj Jain
TP Link TL WN725NEU 150mbps wireless N nano USB Adapter Unboxing
TP Link TL WN725NEU 150mbps wireless N nano USB Adapter Unboxing
Published: 2018/06/24
Channel: AR Maharaj
2wire 802.11g  Wireless PC Card Adapter Driver CD .ISO + User Guide XP-Vista.7 Download
2wire 802.11g Wireless PC Card Adapter Driver CD .ISO + User Guide XP-Vista.7 Download
Published: 2010/05/30
Channel: 855h0le
Major Brand WUSB54G 802.11g Wireless USB Network Adapter
Major Brand WUSB54G 802.11g Wireless USB Network Adapter
Published: 2016/07/13
Channel: Lucinda Moriarty
TeH_ShoW Episode 5
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Published: 2006/01/15
Channel: pentiumone133
Black New 300M 802.11n/b/g Network Wireless WiFi repeater Router WLAN Repeater Wi Fi
Black New 300M 802.11n/b/g Network Wireless WiFi repeater Router WLAN Repeater Wi Fi
Published: 2018/03/18
Channel: Кристина Дорофеева
Black New 300M 802.11n/b/g Network Wireless WiFi repeater Router WLAN Repeater Wi Fi
Black New 300M 802.11n/b/g Network Wireless WiFi repeater Router WLAN Repeater Wi Fi
Published: 2017/05/07
Channel: Alyona Nagaeva
Wireless Network Installation In Larger Up Scale Homes
Wireless Network Installation In Larger Up Scale Homes
Published: 2017/11/12
Channel: Sydney News 24
Belkin F5D7230-4 Wireless G Router
Belkin F5D7230-4 Wireless G Router
Published: 2007/07/19
Channel: TigerDirect
Unionvision UFO 02 Ceiling Router
Unionvision UFO 02 Ceiling Router
Published: 2018/03/13
Channel: Sylvia Lei
802.11g connection while Bluetooth scanning is in progress
802.11g connection while Bluetooth scanning is in progress
Published: 2013/08/30
Channel: Imre Szvorenyi
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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IEEE 802.11g-2003 or 802.11g is an amendment to the IEEE 802.11 specification that extended throughput to up to 54 Mbit/s using the same 2.4 GHz band as 802.11b. This specification under the marketing name of Wi-Fi has been implemented all over the world. The 802.11g protocol is now Clause 19 of the published IEEE 802.11-2007 standard, and Clause 19 of the published IEEE 802.11-2012 standard.

802.11 is a set of IEEE standards that govern wireless networking transmission methods. They are commonly used today in their 802.11a, 802.11b, 802.11g, 802.11n and 802.11ac versions to provide wireless connectivity in the home, office and some commercial establishments.

Descriptions[edit]

802.11g is the third modulation standard for wireless LANs. It works in the 2.4 GHz band (like 802.11b) but operates at a maximum raw data rate of 54 Mbit/s. Using the CSMA/CA transmission scheme, 31.4 Mbit/s[1] is the maximum net throughput possible for packets of 1500 bytes in size and a 54 Mbit/s wireless rate (identical to 802.11a core, except for some additional legacy overhead for backward compatibility). In practice, access points may not have an ideal implementation and may therefore not be able to achieve even 31.4 Mbit/s throughput with 1500 byte packets. 1500 bytes is the usual limit for packets on the Internet and therefore a relevant size to benchmark against. Smaller packets give even lower theoretical throughput, down to 3 Mbit/s using 54 Mbit/s rate and 64 byte packets.[1] Also, the available throughput is shared between all stations transmitting, including the AP so both downstream and upstream traffic is limited to a shared total of 31.4 Mbit/s using 1500 byte packets and 54 Mbit/s rate.

802.11g hardware is fully backwards compatible with 802.11b hardware. Details of making b and g work well together occupied much of the lingering technical process. In an 802.11g network, however, the presence of a legacy 802.11b participant will significantly reduce the speed of the overall 802.11g network. Some 802.11g routers employ a back-compatible mode for 802.11b clients called 54g LRS (Limited Rate Support).

The modulation scheme used in 802.11g is orthogonal frequency-division multiplexing (OFDM) copied from 802.11a with data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s, and reverts to CCK (like the 802.11b standard) for 5.5 and 11 Mbit/s and DBPSK/DQPSK+DSSS for 1 and 2 Mbit/s. Even though 802.11g operates in the same frequency band as 802.11b, it can achieve higher data rates because of its heritage to 802.11a.

Technical description[edit]

Of the 52 OFDM subcarriers, 48 are for data and 4 are pilot subcarriers with a carrier separation of 0.3125 MHz (20 MHz/64). Each of these subcarriers can be a BPSK, QPSK, 16-QAM or 64-QAM. The total bandwidth is 22 MHz with an occupied bandwidth of 16.6 MHz. Symbol duration is 4 microseconds, which includes a guard interval of 0.8 microseconds. The actual generation and decoding of orthogonal components is done in baseband using DSP which is then upconverted to 2.4 GHz at the transmitter. Each of the subcarriers could be represented as a complex number. The time domain signal is generated by taking an Inverse Fast Fourier transform (IFFT). Correspondingly the receiver downconverts, samples at 20 MHz and does an FFT to retrieve the original coefficients. The advantages of using OFDM include reduced multipath effects in reception and increased spectral efficiency.

MCS index RATE bits Modulation
type
Coding
rate
Data rate
(Mbit/s)
13 1101 BPSK 1/2 6
15 1111 BPSK 3/4 9
5 0101 QPSK 1/2 12
7 0111 QPSK 3/4 18
9 1001 16-QAM 1/2 24
11 1011 16-QAM 3/4 36
1 0001 64-QAM 2/3 48
3 0011 64-QAM 3/4 54

Adoption[edit]

The then-proposed 802.11g standard was rapidly adopted by consumers starting in January 2003, well before ratification, due to the desire for higher speeds and reductions in manufacturing costs. By mid 2003, most dual-band 802.11a/b products became dual-band/tri-mode, supporting a and b/g in a single mobile adapter card or access point.

Despite its major acceptance, 802.11g suffers from the same interference as 802.11b in the already crowded 2.4 GHz range. Devices operating in this range include microwave ovens, Bluetooth devices, baby monitors and digital cordless telephones, which can lead to interference issues. Additionally, the success of the standard has caused usage/density problems related to crowding in urban areas. To prevent interference, there are only three non-overlapping usable channels in the U.S. and other countries with similar regulations (channels 1, 6, 11, with 25 MHz separation), and four in Europe (channels 1, 5, 9, 13, with only 20 MHz separation). Even with such separation, some interference due to side lobes exists, though it is considerably weaker.

Channels and frequencies[edit]

802.11b/g channels in 2.4 GHz band
IEEE 802.11g channel to frequency map [2]
Channel Center frequency Channel width Overlapping channels
1 2.412 GHz 2.401 GHz - 2.423 GHz 2,3,4,5
2 2.417 GHz 2.406 GHz - 2.428 GHz 1,3,4,5,6
3 2.422 GHz 2.411 GHz - 2.433 GHz 1,2,4,5,6,7
4 2.427 GHz 2.416 GHz - 2.438 GHz 1,2,3,5,6,7,8
5 2.432 GHz 2.421 GHz - 2.443 GHz 1,2,3,4,6,7,8,9
6 2.437 GHz 2.426 GHz - 2.448 GHz 2,3,4,5,7,8,9,10
7 2.442 GHz 2.431 GHz - 2.453 GHz 3,4,5,6,8,9,10,11
8 2.447 GHz 2.436 GHz - 2.458 GHz 4,5,6,7,9,10,11,12
9 2.452 GHz 2.441 GHz - 2.463 GHz 5,6,7,8,10,11,12,13
10 2.457 GHz 2.446 GHz - 2.468 GHz 6,7,8,9,11,12,13
11 2.462 GHz 2.451 GHz - 2.473 GHz 7,8,9,10,12,13
12 2.467 GHz 2.456 GHz - 2.478 GHz 8,9,10,11,13,14
13 2.472 GHz 2.461 GHz - 2.483 GHz 9,10,11,12,14
14 2.484 GHz 2.473 GHz - 2.495 GHz 12,13
Note: Not all channels are legal to use in all countries.

See also[edit]

References[edit]

[1]

  1. ^ a b c Jun, Jangeun; Peddabachagari, Pushkin; Sichitiu, Mihail (2003). "Theoretical Maximum Throughput of IEEE 802.11 and its Applications" (PDF). Proceedings of the Second IEEE International Symposium on Network Computing and Applications. Archived (PDF) from the original on 2014-03-20. 
  2. ^ http://download.wcvirtual.com/reference/802%20Channel%20Freq%20Mappings.pdf[dead link]
  3. ^ "Official IEEE 802.11 working group project timelines". January 26, 2017. Retrieved 2017-02-12. 
  4. ^ "Wi-Fi CERTIFIED n: Longer-Range, Faster-Throughput, Multimedia-Grade Wi-Fi® Networks" (registration required). Wi-Fi Alliance. September 2009. 
  5. ^ "802.11n Delivers Better Range". Wi-Fi Planet. 2007-05-31. 
  6. ^ "IEEE 802.11ac: What Does it Mean for Test?" (PDF). LitePoint. October 2013. 
  7. ^ Lee, Wookbong; Kwak, Jin-Sam; Kafle, Padam; Tingleff, Jens; Yucek, Tevfik; Porat, Ron; Erceg, Vinko; Lan, Zhou; Harada, Hiroshi (2012-07-10). "TGaf PHY proposal". IEEE P802.11. Retrieved 2013-12-29. 
  8. ^ "802.11ad - WLAN at 60 GHz: A Technology Introduction" (PDF). Rohde & Schwarz GmbH. November 21, 2013. p. 14. 
  9. ^ 802.11ad Antenna Differences: Beamsteering, Gain and Range
  10. ^ Sun, Weiping; Choi, Munhwan; Choi, Sunghyun (July 2013). "IEEE 802.11ah: A Long Range 802.11 WLAN at Sub 1 GHz" (PDF). Journal of ICT Standardization. 1 (1): 83–108. doi:10.13052/jicts2245-800X.125. 
  11. ^ Sun, Rob; Xin, Yan; Aboul-Maged, Osama; Calcev, George; Wang, Lei; Au, Edward; Cariou, Laurent; Cordeiro, Carlos; Abu-Surra, Shadi; Chang, Sanghyun; Taori, Rakesh; Kim, TaeYoung; Oh, Jongho; Cho, JanGyu; Motozuka, Hiroyuki; Wee, Gaius. "P802.11 Wireless LANs". IEEE. pp. 2,3. Archived from the original on 2017-12-06. Retrieved December 6, 2017. 

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