| 摘要 |
An iterative Turbo decoder in which soft bits of a received signal are repetitively subjected to the process of decoding by a first decoder associated with a first encoder in the transmitter, interleaving by an interleaver associated with an interleaver in the transmitter, decoding by a second decoder associated with a second encoder in the transmitter, and deinterleaving by a deinterleaver associated with the interleaver in the transmitter. The improvement is to scale the signal after each decoding by a predetermined value in the vicinity of 0.7 to 0.8. At a signal Eb/No in the vicinity of 1.0 db., an improvement of about 0.2 db. in coding gain is attained while very little complexity is added. Decoders may be according to the max Log MAP algorithm instead of the more complex Log MAP algorithm with only slight degradation of performance.
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