| 摘要 |
A stream of recursive systematic convolutional codes P<SUB>n </SUB>is generated by XORing each bit of an input bit stream I<SUB>n </SUB>with a predetermined bit of the content of a cyclic shift element ( 22 ). The content of the shift element ( 22 ) is updated by adder ( 24 ) under the control of the input bit stream I<SUB>n</SUB>.
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