BER stands for Bit Error Rate, which means the amount of bit errors accumulated in our signal within a period of time. To make things a little clearer, bit error means that the received data becomes '1' instead of '0' (the original transmitted data) or vice versa.
For example, our handphone transmits 1111111111 (10 bits of data) but the Base Transceiver Station (BTS/RBS) instead receives 1111011111 (same 10 bits of data). Thus, the resulting BER is 1/10 and is usually stated as BER 10e-1 (or sometimes pronounced as BER minus 1). In short, the system suffers 1 corrupted bit out of 10 transmitted bits.
Usually the standard BER range used by telecommunication companies (telecos) and vendors are:_
10e-3 = 1 bit error out of 1000 bits
10e-6 = 1 bit error out of 1 million bits
10e-9 = 1/1000000000 bit error
Hence, BER minus 3 suffers worse error than BER minus 9, not the other way round! Don't get it mixed up!
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