Decoder and receiver using the same
OwnerToshihiro Hattori, Hideyuki Morita +1inventors
InventorsToshihiro Hattori, Hideyuki Morita, Tsukie Uegaki
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Abstract
A turbo decoder has a control portion, a decoding portion and the like. The control portion determines the repeating number of times of the calculation for the second likelihood Ra to obtain the repeating number of times in association with the condition of the communication environment. The decoding portion decodes the error-correction code by using the repeating number of times determined at the control portion so that the decoded data is obtained efficiently by performing the decode so as to correspond to the condition of the communication environment.
Claims6
A decoder for being adopted to a receiver receiving a signal having an error-correction code and a known code of an information code comprising:
- a decoding portion for decoding the received error-correction code using a parameter;
- an error calculating portion for calculating an error level of the known code;
- and
- a determining portion for determining said parameter based on the error level calculated at the error calculating portion.
A decoder for being adopted to a receiver receiving a signal having an error-correction code and a known code of an information code, and converting the error-correction code to an N-bit digital signal, comprising:
- an error calculating portion for calculating an error level of the known code;
- a determining means for determining whether or not the calculated error level is equal to or higher than a reference value;
- a data setting means for obtaining the data having a constant value in the L-bit portion of the N-bit digital signal data from a LSB side of the N-bit digital signal, wherein a value of the L in the L-bit is smaller than that of the N in the N-bit;
- and
- a decoding portion for decoding the N-bit digital signal when it is determined that the error level is equal to or higher than the reference value, and decoding the data obtained at the data setting means when it is determined that the error level is lower than the reference value.
A decoder for being adopted to a receiver receiving a signal having an error-correction code and a known code of an information code, and converting the error-correction code to an N-bit digital signal, comprising:
- an error calculating portion for calculating an error level of the known code;
- a determining means for determining whether or not the calculated error level is equal to or higher than a reference value;
- a data modifying means for modifying the N-bit digital data to a M-bit digital data, wherein the value of the M in the M-bit is smaller than the value of the N in the N-bit;
- and
- a decoding portion for decoding the N-bit digital signal when it is determined that the error level is equal to or higher than the reference value, and decoding the M-bit digital signal when it is determined that the error level is lower than the reference value.
Dependencies are inferred from the claim text.