The invention pertains in general to the testing of the operation of radio and
other data transmission apparatus. In particular the invention pertains to the
testing of the operation of a digital radio apparatus on the basis of error statistics.
In order to test functions relating to data transmission, a simulation system produces
a pseudorandom bit sequence or some other test sequence which is packed into downlink
frames and sent to the data transmission apparatus tested. In accordance with the
invention, a known number of errors are generated in the test sequence. As the
data transmission apparatus tested compares the received test sequence to the sequence
it has produced, it detects the errors in the received sequence and compiles various
error statistics, e.g., in the form of bit error ratio (BER) or frame erasure ratio
(FER). An uplink connection is used to send these statistical data to the simulation
system which examines whether the information produced by the data transmission
apparatus tested matches the simulation system's information about the erroneousness
of the sequence sent downlink.
