APPARATUS FOR MEASURING BIT ERROR RATIO BY USING A VITERBI DECODER

摘要

There is disclosed an apparatus for measuring a bit error ratio by using a viterbi decoder comprising: a viterbi decoding unit that decodes demodulated trellis encoded data by using a maximum likelihood decoding method; a cyclic redundancy code regenerating unit; and a trellis re-encoding unit that receives reconstructed data from said cyclic redundancy code regenerating units, and encodes said reconstructed data said cyclic redundancy code regenerating unit being disposed between said viterbi decoding unit and said trellis re-coding unit, that receives from said viterbi decoding unit decoded data that contains cyclic redundancy code bits, removes said cyclic redundancy codes, and generates and adds new cyclic redundancy code bits; said demodulated trellis encoded data being voice information, transmitted from a transmitter, to which cyclic redundancy codes bits have been added and which has been trellis encoded prior to transmission; said reconstructed data being trellis encoded in the same manner said voice information was trellis encoded prior to transmission; and said new cyclic redundancy codes bits being added to said voice information.