Radio Signal Propagation
Wireless Propagation Problems
Radio bands
WLAN operation
100

It connects wireless clients to the wired LAN.

Wireless access point

100

They are the places where signals cannot penetrate because of obstacles on transmission paths.

Shadow zones

100

It means wide radio channel bandwidth and high transmission speed.

Broadband

100

It is the name of the network.

SSID

200

It is a digital modulation scheme where binary data is transmitted through phase modulation. A phase shift of 0 degrees represents '1', while a phase shift of 180 degrees represents '0'.

BPSK

200

It is unwanted power at the same frequency from other devices (such as microwaves and telephones).

Electromagnetic interference (EMI)

200

It refer to specific frequency ranges that are regulated by the government. Only licensed entities can transmit radio signals within that frequency range.

Licensed radio bands

200
It is the speed that the standard specifies.

Rated speed

300

Mobile phones use this type of antenna.

Omnidirectional antenna

300

These two types of propagation problem becomes more serious when radio frequency becomes higher.

Absorptive attenuation and shadow zones

300
802.11 Wi-Fi operates in this type of service band.

Unlicensed radio band

300

It is the actual speed that WLAN delivered.

Throughput

400

This type of antenna must point at receiver.

Dish antenna

400

This type of interference occurs when multiple signals traveling different paths interfere.

Multipath interference

400

It is the entire span of frequencies, from 0 Hz to infinity.

Frequency spectrum

400

This technology utilizes multiple antennas at both the transmitter and receiver.

MIMO

500

It is a digital modulation scheme using phase modulation. The signal is divided into four phase states and each phase state represents a combination of two bits.

BPSK

500

This type of attenuation describes that, with increasing distance from the source, the signal strength would fall.

Inverse Square Law Attenuation

500

This is the range of 2.4 GHz service band.

2.4 GHz to 2.485 GHz

500
It refers to the collection of access points that all have the same SSID.

Extended service set (ESS)

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