Device, system and method of decoding wireless transmissions
Some demonstrative embodiments include devices, systems and/or methods of turbo decoding. For example, a device may include a turbo decoder to decode a turbo-encoded input according to a turbo code, the turbo-encoded input including a plurality of soft-decision information-bit values and a plurality of soft-decision parity-bit values corresponding to the soft-decision information bit values, wherein the turbo decoder is to output a plurality of extrinsic soft-decision parity-bit values corresponding to the plurality soft-decision parity-bit values. Other embodiments are described and claimed.
1. A device comprising:
a turbo decoder to decode a turbo-encoded input according to a turbo code, the turbo-encoded input including a plurality of soft-decision information-bit values and first and second pluralities of soft-decision parity-bit values corresponding to the soft-decision information bit values,
wherein the turbo decoder is to output first and second pluralities of extrinsic soft-decision parity-bit values corresponding to the first and second pluralities of soft-decision parity-bit values,
wherein said turbo decoder comprises first and second soft-input-soft-output (SISO) decoders to decode the turbo-encoded input using the first and second pluralities of soft-decision parity-bit values,
wherein the first SISO decoder is configured to generate the first plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, said first plurality of soft-decision parity-bit values and a plurality of extrinsic soft-decision information-bit values corresponding to the plurality of soft-decision information-bit values,
and wherein the second SISO decoder is configured to generate the second plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, and said second plurality of soft-decision parity-bit values.
2. The device of claim 1 , wherein the turbo-encoded input corresponds to an output of a receiver module, and wherein the turbo decoder is to provide at least one of the first and second pluralities of extrinsic parity-bit values as feedback to the receiver module.
3. The device of claim 2 , wherein the turbo decoder is to feedback to the receiver module the plurality of extrinsic soft-decision information-bit values.
4. The device of claim 1 , wherein the second SISO decoder is to determine a plurality of branch-metrics based at least on the plurality of soft-decision information-bit values and the second plurality of soft-decision parity-bit values, and wherein the second SISO decoder is to determine the second plurality of extrinsic soft-decision parity-bit values based on the branch metrics.
5. The device of claim 4 , wherein the second SISO decoder is to update one or more of the branch-metrics based on the second plurality of extrinsic soft-decision parity-bit values.
6. The device of claim 1 , wherein the first SISO decoder is to determine a plurality of branch-metrics based on the plurality of soft-decision information-bit values, the first plurality of soft-decision parity-bit values, and the extrinsic soft-decision information-bit values, and wherein the first SISO decoder is to determine the first plurality of extrinsic soft-decision parity-bit values based on the branch metrics.
7. The device of claim 6 , wherein the first SISO decoder is to update one or more of the branch-metrics based on the first plurality of extrinsic soft-decision parity-bit values.
8. The device of claim 1 , wherein an extrinsic soft-decision parity-bit value of the first and second pluralities of extrinsic soft-decision parity-bit values is proportional to a probability that a respective soft-decision parity-bit value of the first and second pluralities of soft-decision parity-bit values has a predefined value.
9. The device of claim 8 , wherein the extrinsic soft-decision parity-bit value is based on a log-likelihood-ratio value corresponding to the respective soft-decision parity-bit value.
10. A wireless communication system comprising:
one or more antennas; and
a receiver to receive a wireless communication transmission encoded according to a turbo code, the receiver comprising:
an equalizer to generate an equalized output based on the received transmission; and
a turbo decoder to decode a turbo-encoded input corresponding to the equalized output, and to provide the equalizer with a feedback including extrinsic values corresponding to the turbo-encoded input,
wherein the turbo-encoded input includes a plurality of soft-decision information-bit values and first and second pluralities of soft-decision parity-bit values corresponding to the soft-decision information bit values, and the feedback includes first and second pluralities of extrinsic soft-decision parity-bit values corresponding to the first and second pluralities of soft-decision parity-bit values,
and wherein said turbo decoder comprises first and second soft-input-soft-output (SISO) decoders to decode the turbo-encoded input using the first and second pluralities of soft-decision parity-bit values, the first SISO decoder is configured to generate the first plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, said first plurality of soft-decision parity-bit values and a plurality of extrinsic soft-decision information-bit values corresponding to the plurality of soft-decision information-bit values, and the second SISO decoder is configured to generate the second plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, and said second plurality of soft-decision parity-bit values.
11. The system of claim 10 , wherein the equalizer is to adjust one or more equalizer parameters based on the feedback.
12. The system of claim 10 , wherein the first SISO decoder is to determine a plurality of branch-metrics based on the plurality of soft-decision information-bit values, the first plurality of soft-decision parity-bit values, and the extrinsic soft-decision information-bit values, and wherein the first SISO decoder is to determine the first plurality of extrinsic soft-decision parity-bit values based on the branch metrics.
13. The system of claim 10 , wherein the second SISO decoder is to determine a plurality of branch-metrics based at least on the plurality of soft-decision information-bit values and the second plurality of soft-decision parity-bit values, and wherein the second SISO decoder is to determine the second plurality of extrinsic soft-decision parity-bit values based on the branch metrics.
14. The system of claim 10 , wherein an extrinsic soft-decision parity-bit value of the first and second pluralities of extrinsic soft-decision parity-bit values is proportional to a probability that a respective soft-decision parity-bit value of the first and second pluralities of soft-decision parity-bit values has a predefined value.
15. A method comprising:
decoding a turbo-encoded input received from a receiver module, the turbo-encoded input includes a plurality of soft-decision information-bit values and first and second pluralities of soft-decision parity-bit values corresponding to the soft-decision information bit values; and
feeding back to the receiver module a plurality of extrinsic soft-decision bit values corresponding to the turbo-encoded input, the feedback includes first and second pluralities of extrinsic soft-decision parity-bit values corresponding to the first and second pluralities of soft-decision parity-bit values,
wherein the decoding includes using first and second soft-input-soft-output (SISO) decoders to decode the turbo-encoded input using the first and second pluralities of soft-decision parity-bit values, the first SISO decoder is configured to generate the first plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, said first plurality of soft-decision parity-bit values and a plurality of extrinsic soft-decision information-bit values corresponding to the plurality of soft-decision information-bit values, and the second SISO decoder is configured to generate the second plurality of extrinsic soft-decision parity-bit values based at least on said plurality of soft-decision information-bit values, and said second plurality of soft-decision parity-bit values.
16. The method of claim 15 , wherein the decoding includes using the first SISO decoder to determine a plurality of branch-metrics based on the plurality of soft-decision information-bit values, the first plurality of soft-decision parity-bit values, and the extrinsic soft-decision information-bit values, and to determine the first plurality of extrinsic soft-decision parity-bit values based on the branch metric.
17. The method of claim 16 , comprising updating one or more of the branch-metrics based on the first plurality of extrinsic soft-decision parity-bit values.
18. The method of claim 15 , wherein the decoding includes using the second SISO decoder to determine a plurality of branch-metrics based at least on the plurality of soft-decision information-bit values and the second plurality of soft-decision parity-bit values, and to determine the second plurality of extrinsic soft-decision parity-bit values based on the branch metrics.