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Speech Quality Index is a performance metric for voice quality in GSM. However it is to be noted that SQI (speech quality index), is not a standard performance metric for GSM, and is specific only to the TEMS family of drive testing/field testing tools.
SQI aims to provide a reasonable estimate of the voice quality, as perceived by a human ear. It aims to achieve what Mean opinion score for PESQ does, however it does so without comparing a received sample with a reference sample. Instead SQI simply takes the downlink RF measurments into account and provides a value within 0-30db, with 30 db being the best quality and 0 db being the worst.
The inputs to the SQI algorithm for calculating SQI are,
FER (Frame error rate), Number of frames lost, out of total frames. This also accounts for frames lost in GSM handovers.
BER (Bit Error Rate), Number of bits received in error, out of total received bits.
Speech Codec used: What exact speech codec is being used for the call at the moment, since the bitrate of a speech codec directly influences voice quality.
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D-amps has appreciably worse speech quality than gsm is this due to the requirement that damps be backward compatible with amps whereas gsm had no such constraint if not what is the cause?
GSM provides a better speech quality due to the fact that it is the per user bandwidth that GSM can provide. D-AMPS bandwidth is 24.96 MHz and GSM is 24.8 MHz.
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