METHOD AND APPARATUS FOR MAP DECODING AND TURBO DECODER USING THE SAME
First Claim
1. A Maximum A Posteriori (MAP) decoder comprising:
- a first metric operation unit outputting a first metric data using an input data;
a first bit-width control unit controlling a bit-width of the first metric data according to a modulation scheme of the input data;
a second metric operation unit outputting a second metric data using the first metric data having the controlled bit-width;
a Log Likelihood Ratio (LLR) operation unit outputting LLR data using the second metric data; and
a second bit-width control unit outputting decoding data by controlling the bit-width of the LLR data.
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Abstract
A Maximum A Posteriori (MAP) decoder and a MAP decoding method are provided. The MAP decoder includes a first metric operation unit, a first bit-width control unit, a second metric operation unit, a Log Likelihood Ratio (LLR) operation unit, and a second bit-width control unit. The first metric operation unit outputs a first metric data using an input data. The first bit-width control unit controls a bit-width of the first metric data according to a modulation scheme of the input data. The second metric operation unit outputs a second metric data using the first metric data having the controlled bit-width. The LLR operation unit outputs LLR data using the second metric data. The second bit-width control unit outputs decoding data by re-controlling the bit-width of the LLR data.
76 Citations
20 Claims
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1. A Maximum A Posteriori (MAP) decoder comprising:
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a first metric operation unit outputting a first metric data using an input data; a first bit-width control unit controlling a bit-width of the first metric data according to a modulation scheme of the input data; a second metric operation unit outputting a second metric data using the first metric data having the controlled bit-width; a Log Likelihood Ratio (LLR) operation unit outputting LLR data using the second metric data; and a second bit-width control unit outputting decoding data by controlling the bit-width of the LLR data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A MAP decoding method comprising:
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outputting a first metric data using an input data; controlling a bit-width of the first metric data according to a modulation scheme of the input data; outputting a second metric data using the first metric data having the controlled bit-width; outputting LLR data using the second metric data; and controlling a bit-width of the LLR data. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A turbo decoder comprising:
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a first MAP decoder outputting a first LLR using a deinterleaved LLR and a first input data from a demodulator; an interleaver interleaving data acquired by subtracting the deinterleaved LLR from the first LLR; a second MAP decoder outputting a second LLR using a second input data received from the demodulator and the interleaved data ; and a first deinterleaver deinterleaving data acquired by subtracting the data outputted from the interleaver from the second LLR to transmit to the first MAP decoder, wherein each of the first and the second MAP decoders comprise; a first metric operation unit outputting a first metric data using the input data; a first bit-width control unit controlling a bit-width of the first metric data according to a modulation scheme of the input data; a second metric operation unit outputting a second metric data using the first metric data having the controlled bit-width; an LLR operation unit outputting LLR data using the second metric data; and a second bit-width control unit outputting decoding data by controlling the bit-width of the LLR data. - View Dependent Claims (18, 19, 20)
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Specification