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Abstract

A method for creating cyclic permutation matrices P (810), with an arbitrary size Z×Z set by a parameter Z5 and which are used to create one or more LDPC related matrices in OFDMA systems, comprising: defining an integer value Z; creating an initial matrix (810); creating a matrix (810) by using cyclic shifts to each row; repeating stage 3, up to Z−2 times as required, thus creating up to Z−2 matrices: P(o) . . . P(Z−I); creating an additional stairs matrix P(st). A method for using cyclic per-mutation matrixes P (840), with a fixed size Z×Z set by a parameter Z, and which are used to create one or more LDPC related matrices (820) in OFDMA systems, comprising: defining an integer value Z; storing in memory means an initial matrix (810) and its cyclic shifts permutations (840), thus keeping memory means matrices: P(o) . . . P(Z−I); storing an additional stairs matrix P(st) (840); using these matrices (810) to create LDPC related matrices (840) or LDPC operations.

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