Patent ID: 8953703
Filing Date: 2015-02-10
Classification: H03M,H04B,H04L

Abstract:
1. An interleaving method performed by a transmitter for a communication system with spatial multiplexing over T transmit antennas employing quasi-cyclic low-density parity-check codes, T being an integer greater than 1, the interleaving method being used for applying bit permutation to bits of a codeword of a quasi-cyclic low-density parity-check code in order to generate a plurality of constellation words of at least one spatial-multiplexing block from the codeword, the codeword consisting of N cyclic blocks, and each cyclic block consisting of Q bits, the spatial-multiplexing block consisting of B bits and consisting of T constellation words, each constellation word indicating one of a plurality of constellation points of a predefined constellation used for constellation mapping of the constellation word, the bits of each constellation word being divisible into pairs of bits having the same robustness, wherein the interleaving method comprises the step of applying the bit permutation to the bits of the codeword such that: at least one spatial-multiplexing block is made up of bits from B/2 different cyclic-blocks; each constellation word of the at least one spatial-multiplexing block is made up of bits from B each of the bit pairs of the constellation word is made up of bits from a common one of the B