Received signal strength indication link like other metrics such as travel time measurement (time of arrival). Received signal strength indication In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal. RSSI is usually invisible to a user of a receiving device. However, because signal strength can vary greatly and affect functionality in wireless networking, IEEE 802.11 devices often make the measurement available to users. RSSI is often derived in the intermediate frequency (IF) stage before the IF amplifier. In zero-IF systems, it is derived in the baseband signal chain, before the baseband amplifier. RSSI output
Signal generator been embedded hardware units, but since the age of multimedia PCs, flexible, programmable software tone generators have also been available. In June 1928, the General Radio 403, was the first commercial signal generator ever marketed. It supported a frequency range of 500Hz to 1.5MHz. Also, in April 1929, the first commercial frequency standard was marketed by General Radio with a frequency of 50KHz. A function generator is a device which produces simple repetitive waveforms. Such devices contain an electronic oscillator, a circuit that is capable of creating a repetitive waveform. (Modern devices may use digital signal processing to synthesize waveforms,