Link quality analysis
Encyclopedia
In adaptive high-frequency (HF) radio
, link quality analysis (LQA) is the overall process by which measurements of signal quality are made, assessed, and analyzed.
In LQA, signal quality is determined by measuring, assessing, and analyzing link
parameters, such as bit error ratio
(BER), and the levels of the ratio of signal-plus-noise
-plus-distortion
to noise-plus-distortion (SINAD
). Measurements are stored at—and exchanged between—stations, for use in making decisions about link establishment.
For adaptive HF radio, LQA is automatically performed and is usually based on analyses of pseudo-BERs and SINAD readings.
Radio
Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...
, link quality analysis (LQA) is the overall process by which measurements of signal quality are made, assessed, and analyzed.
In LQA, signal quality is determined by measuring, assessing, and analyzing link
Data link
In telecommunication a data link is the means of connecting one location to another for the purpose of transmitting and receiving information. It can also refer to a set of electronics assemblies, consisting of a transmitter and a receiver and the interconnecting data telecommunication circuit...
parameters, such as bit error ratio
Bit error ratio
In digital transmission, the number of bit errors is the number of received bits of a data stream over a communication channel that have been altered due to noise, interference, distortion or bit synchronization errors....
(BER), and the levels of the ratio of signal-plus-noise
Noise
In common use, the word noise means any unwanted sound. In both analog and digital electronics, noise is random unwanted perturbation to a wanted signal; it is called noise as a generalisation of the acoustic noise heard when listening to a weak radio transmission with significant electrical noise...
-plus-distortion
Distortion
A distortion is the alteration of the original shape of an object, image, sound, waveform or other form of information or representation. Distortion is usually unwanted, and often many methods are employed to minimize it in practice...
to noise-plus-distortion (SINAD
SINAD
SINAD stands for Signal-to-noise and distortion ratio. It is a measure of the quality of a signal from a communications device, often defined as:...
). Measurements are stored at—and exchanged between—stations, for use in making decisions about link establishment.
For adaptive HF radio, LQA is automatically performed and is usually based on analyses of pseudo-BERs and SINAD readings.