Digital Signal Processing Reference
In-Depth Information
usually specified in dB. In the event of pure noise impairment, the MER is
equal to the S/N ratio.
The following applies:
MER[dB] <= S/N[dB];
MER
RMS
[dB] = -10 log(1/n • (|error_vector|
2
/P
signal_without_pilot
);
Fig. 24.7.
Numerical results output by an 8VSB test receiver
Many test parameters are also output as numerical results by the 8VSB
test receiver. These include the signal amplitude, bit error rate, pilot ampli-
tude, symbol rate, phase jitter, S/N ratio, and MER.
24.4 Measuring Amplitude Response and Group Delay
Response
Although the ATSC/8VSB signal carries no pilot signals that would pro-
vide information on channel quality, the amplitude, group-delay and phase
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