Digital data decoder with improved unreliable frame detection performance
AssigneeNEC Corporation
InventorMark Burton
Life of this patent
Estimating the term…
Abstract
A received frame is provided to a first decoder and a first time reverse unit. The first decoder decodes the provided frame and outputs the decoded frame. The first time reverse unit reverses bits of the provided frame in time direction and outputs the time reversed frame. The time reversed frame is provided to a second decoder. The second decoder decodes the time reversed frame. This decoded frame is then provided to a second time reverse unit. The second time reverse unit reverses bits of the decoded frame in time direction and outputs the frame. The frame is outputted from the first decoder is compared with the frame is outputted from the second time reverse unit by comparator. If any difference exist between the two frames then the received frame is judged as unreliable.
Claims6
A digital data decoder comprising:
- an equalizer for equalizing, de-interleaving and de-puncturing a received frame and outputting the frame;
- a first decoder for decoding the frame outputted from said equalizer and outputting the decoded frame;
- a first time reverse unit for reversing bits of the frame outputted from said equalizer in a time reversed direction and outputting the time reversed frame;
- a second decoder for decoding the frame outputted from said first time reverse unit and outputting the decoded frame;
- a second time reverse unit for reversing bits of the frame outputted from said second decoder in a time reversed direction and outputting the time reversed frame;
- a comparator for comparing the frame outputted from said first decoder with the frame outputted from said second time reverse unit and outputting the result of the comparison;
- and
- a judgment unit for judging the received frame as either reliable or unreliable in accordance with the result of the comparison outputted from said comparator.
A digital data decoder comprising:
- an equalizer for equalizing, de-interleaving and de-puncturing a received frame and outputting the frame as strings of n bits;
- a first decoder for decoding the strings outputted from said equalizer and outputting the decoded strings as a first sequence;
- a first time reverse unit for reversing bits of the strings outputted from said equalizer in a time reversed direction and outputting the time reversed strings;
- a second decoder for decoding the strings outputted from said first time reverse unit and outputting the decoded strings;
- a second time reverse unit for reversing bits of the strings outputted from said second decoder in a time reversed direction and deleting offset bits caused by the reversing process and the decoding process from the time reversed strings and outputting the strings as a second sequence;
- a comparator for comparing said first sequence with said second sequence and outputting the result of the comparison;
- and
- a judgment unit for judging the received frame as either reliable or unreliable in accordance with the result of the comparison outputted from said comparator.
Dependencies are inferred from the claim text.