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A method and apparatus for protecting a first group of data bits using a second group of data bits within digital data transmissions is disclosed. First and second groups of data bits are encoded for transmission in a communication network. The second group of encoded data bits are scrambled using a

A method and apparatus for protecting a first group of data bits using a second group of data bits within digital data transmissions is disclosed. First and second groups of data bits are encoded for transmission in a communication network. The second group of encoded data bits are scrambled using a scrambling mask generated from the first group of data bits. The first group of encoded data bits and the second group of encoded and scrambled data bits are then interleaved and transmitted to a receiver. The first group of data bits are decoded and used to regenerate the scrambling mask to descramble the second group of encoded and scrambled data bits. The second group of data bits may then be decoded. The results of the decoding of the second group of data bits are used to determine whether or not the first group of data bits were properly decoded.

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[ What is claimed is:] [1.] An apparatus for coding information bits for transmission, comprising:a separator for sorting the information bits into a first group of information bits and a second group of information bits;a first convolutional encoder for coding the first group of information bits to

[ What is claimed is:] [1.] An apparatus for coding information bits for transmission, comprising:a separator for sorting the information bits into a first group of information bits and a second group of information bits;a first convolutional encoder for coding the first group of information bits to produce a third group of coded information bits;a second convolution encoder for coding the second group of information bits to produce a fourth group of coded information bits, wherein a ratio of the third group of information bits to the first group of information bits is greater than a ratio of the fourth group of information bits to the second group of information bits;scrambling circuitry for scrambling the fourth group of coded information bits in dependence on the first group of information bits to produce a fifth group of scrambled, coded information bits; anda transmitter for transmitting each of the fifth group of scrambled, coded information bits and each of the third group of coded information bits in a predetermined transmission sequence.