SMIQ
Bit Error Rate Test
1125.5555.03
2.381
E-9
reliable BLER can only be obtained when a sufficient number of errors occurs in
the observed interval. Only this ensures that the single BLER measurement result
approaches the true error rate with high probability.
Termination
criteria
To keep the measurement time short for low and high block error rates, two
termination criteria have been provided in the SMIQ for the BLER measurement.
•
Criterion 1: Total number of blocks
The measurement is terminated when the specified number of data blocks is
checked. Due to this criterion the BLER measurement is reliably terminated
after the specified number of blocks even if no error or only a few errors were
detected; the measurement result may not be statistically reliable (if few block
errors occur).
•
Criterion 2: Number of errors
The measurement is terminated when the specified number of block errors has
occurred. With this criterion, the measurement is rapidly terminated when the
block error rate is high. Since a great number of errors has been counted, the
measurement result is statistically reliable.
The two criteria are used together. The criterion which finally yields a valid result is
displayed under ("Measurement terminated by...").
Interruption of
measurement
After termination of a measurement, the restart of a new one is delayed until the
first measurement result has been queried with
:BLER:RES?
.
