Patent ID: 7957492

Claim:
A decoder, comprising: a codeword receiving unit configured to: receive a first codeword information and at least second codeword information; send the first codeword information; and subsequently send the second codeword information; a codeword decision unit configured to: receive the first codeword information and subsequently receive the at least second codeword information sent by the codeword receiving unit; decide and output a first codeword decision on the basis of said first codeword information received from said codeword receiving unit; and decide and output a second codeword decision on the basis of said at least second codeword information and said preceding first codeword information; a memory configured to store a list of allowable codewords; and a list reduction unit configured to reduce the list of allowable codewords, wherein when a new transmission time interval begins, the list of allowable codewords is reset to a list of available codewords and the list reduction unit is configured to reduce the list of allowable codewords for a next codeword decision on a basis of a previous codeword information, wherein the list of allowable codewords is reduced on the basis of a latest codeword decision, and wherein codewords of the list of allowable codewords for which a transmission frame indicator of a respective transmission channel is not equal to a transmission frame indicator given by the latest codeword decision are temporarily canceled if a transmission time interval of that transmission channel passes over from a latest frame to a next frame.