| 摘要 |
An apparatus and method for aligning a trellis demapped data stream with a data stream output from a rate 1/2 Viterbi decoder can be implemented at either the transmitter or the receiver. When implemented at the receiver, the present invention provides a Viterbi decoder for providing output of a Viterbi decoded signal. A reencoder reencodes the Viterbi decoded signal to provide output of a reencoded signal. A trellis demapper demaps the reencoded signal to provide output of a trellis demapped signal. A delay unit receives and delays output of the Viterbi decoded signal so that the delayed Viterbi decoded signal exhibits a predetermined temporal alignment with respect to the trellis demapped signal. In this manner, efficient, synchronized system operation is achieved.
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