Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [802.11]

IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specifications for implementing wireless local area network (WLAN) computer communication in the 2.4, 3.6, 5 and 60 GHz frequency bands. Most knows are IEEE 802.11b, IEEE 802.11g, IEEE 802.11n.

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Why does the 802.11 wifi spec allow for 11 channels?

The general wisdom is that it is better to only ever use channels 1, 6, and 11 as they are the only three non-overlapping channels for 2.4ghz wifi (in the US), and two adjacent networks on the same channel would perform better than two adjacent…
AndrewH
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Lowest latency out of the 802.11 Wi-Fi standards

I'm making a project using an Arduino and an ESP8266 module running the esp-link firmware - which gives me the ability to use MQTT for controlling the Arduino. I'd looked at something like an XBee module instead - but they're so damn expensive…
seanlano
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Can two 802.11n devices communicate via a coaxial cable?

Coaxial cables with RP-SMA connectors are often used as extensions for external antennas / with software defined radios. What would happen if I were to connect two access points (wifi chips, via their antenna ports) using a coaxial cable? Would they…
Geosearchef
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Adding Wifi+ Micro-controller to a device in an economical but production-able way

Is it possible to reliably and economically add Wifi+ Micro-controller(for very simple logic and GPIO) to a non-moving device? I see some wifi soc in the market too. are these a viable options? I am hoping that the wifi+logic won't cost more than 5$…
iCode
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Why 802.11g has a maximum throughput of 54mbps?

Can anyone explain why the maximum throughput of the IEEE 802.11g standard has a maximum throughput of 54mbps I can not find that. I would like to know how do you get this 54 taking into account the bandwidth (22 MHz) and the modulation scheme used.…
edgarstack
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WiFi antenna 1T1R mode

I have a question related to 802.11n wi-fi antenna. What actually do we mean by 1T1R mode for Wi-Fi? As per wiki, the same channel is used for Tx &…
Allan
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How does my 802.11 a/b/g/n wireless card determine the modulation to use?

I was thinking yesterday about how the 802.11 a/b/g/n standards all use different modulation schemes, but my wireless card manages to detect frames from networks that may use any of those modulations. So, when my card detects a signal containing a…
shwoseph
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Why does probe request signal varies significantly in the same second?

I’m doing a crowdsensing experiment and I'm capturing a handful of probe requests packets in my Raspberry Pi 3B in my vehicle. To test them, I capture a handful of packets of my own phone. Whenever I did I log the timestamp and the received strength…
Marcos Roriz Junior
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Does Bluetooth 4 or 802.11b/g/n penetrate through walls better?

I'm thinking of building a signal beacon designed to be used indoors. The transfer speed isn't critical but range and penetrative ability are. Does anyone know if Bluetooth 4 or 802.11b/g/n might be better for this application? In both cases, there…
Kar
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Does bluetooth implement the 802.11 wireless standard?

I've read that the Bluetooth standard is IEEE 802.15, but it is implemented with IEEE 802.11. Is this true? Do they interfere with each other? What standard is Bluetooth considered to use?
pensono
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What is the length of one symbol sent through WiFI?

Having a WiFi emitter sending a frame, how much time does each symbol take? And therefore, what distance do they spread over? This depends on the Modulation Coding Scheme. I would like to know which of the various 802.11 norms has the shortest…
bokan
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Time Synchronization between stations over WIFI 802.11n

I'm working on a wireless (2.4Ghz WiFi 11n) project where multiple nodes (ESP32) send very small data to the AP, something like 40 bytes every minute or so. I need to maintain an accurate coordinated clock between them, absolute accuracy doesn't…
Colas
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Development of proprietary WiFi protocol

I would like to do some customizations to IEEE 802.11 MAC layer protocol and implement it on hardware. I searched rigorously but I could not find any chipset with 802.11 PHY (RF + baseband chipset) using which I can implement custom MAC layer…
Ashutosh
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speed of 802.11n using 2 antennas

My Wifi router claims to provide bit rate upto 300Mbps and support 802.11 b/g/n. But 802.11n standard requires using 4 streams(4x4 MIMO technique) using 4 different antennas. Mine has only 2 antennas. It should have been capable of providing only…
vai
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Why does 802.11 use the same modulation for each subcarrier?

In Wireless Communications, Dr. Molisch writes that the 802.11 standard "does not foresee truly adaptive modulation in the sense that the modulation alphabet can differ from subcarrier to subcarrier." Why did the 802.11 standards committee not…
awelkie
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