1. Home
2. Notizie
3. Getting your BERs right

Getting your BERs right

Getting your Bit Error Ratios right

A unique feature of the digital DVB-T modulator MO-170 is the insertion of bit errors in different stages of the DVB-T modulation chain. This can help to check the accuracy of the BER estimation algorithms implemented in high-end professional receivers.

A Channel BER (CBER or BER before the Viterbi decoder) ranging between 7.6x10^-6 and 1.25x10^-1 is generated by modifying the sequence of bits at the input to the constellation mapper. Analogously, the MO-170 is able to generate a Viterbi BER (VBER or BER after Viterbi) going from 3.7x10^-9 to 6.2x10^-2 by properly processing the bits at the output of the Reed-Solomon encoder. The main advantage of this technique when compared with varying the C/N to get the desired CBER or VBER, is its high resolution and unparalleled accuracy.

QEF VBER insertion in the MO-170 and BER measured
by the TV EXPLORER field strength meter

PROMAX è un produttore leader di sistemi di test e misura, impianti di distribuzione di segnale broadcast e TV. Le nostre linee di prodotto includono strumenti di misura per TV via cavo, TV satellitare, reti ottiche broadcast, wireless e fibra, gli analizzatori di FTTH e GPON. Modulatori DVB-T, stelle filanti IP o IP convertitori (ASI, DVB-T) sono tra i più recenti sviluppi della società.