Apparatus and method for orthogonal cover code (OCC) generation, and apparatus and method for OCC mapping

An orthogonal cover code generation method, comprising:

• a first orthogonal cover code sequence group generation step of generating, by a processor, a first group of orthogonal cover code sequences C1 represented by a matrix of [Cn,1(1), Cn,1(2), . . . Cn,1(M)], which satisfy that any adjacent truncated sub cover code sequences [C2j-1,1(2m−1), C2j-1,1(2m)] and [C2j,1(2m−1), C2j,1(2m)] are also mutually orthogonal, wherein n is an index of N orthogonal cover code sequences included in the first group of orthogonal cover code sequences, M is a spreading factor of the orthogonal cover code sequence as a spreading sequence, N≦M, j is an integer satisfying 1≦j≦N/2, and m is an integer satisfying 1≦m≦M/2;
• a second orthogonal cover code sequence group generation step of performing, by the processor, column mirroring on the first group of orthogonal cover code sequences, so as to generate a second group of orthogonal cover code sequences C2;
• a third orthogonal cover code sequence group generation step of performing, by the processor, cyclic shift processing of column vectors on the first group of orthogonal cover code sequences, so as to generate a third group of orthogonal cover code sequences C3;
• a fourth orthogonal cover code sequence group generation step of performing, by the processor, column mirroring on the third group of orthogonal cover code sequences, so as to generate a fourth group of orthogonal cover code sequences C4;
• and
• a transmit step of transmitting, by a transmitter, each of the first group, second group, third group, and fourth group of orthogonal cover code sequences.

A wireless communication system comprising:

• a transmission apparatus and a reception apparatus,
• wherein the transmission apparatus includes:
• a processor configured to:
• generate a first group of orthogonal cover code sequences C1 represented by a matrix of [Cn,1(1), Cn,1(2), . . . Cn,1(M)], which satisfy that any adjacent truncated sub cover code sequences [C2j-1,1(2m−1), C2j-1,1(2m)] and [C2j,1(2m−1), C2j,1(2m)] are also mutually orthogonal, wherein n is an index of N orthogonal cover code sequences included in the first group of orthogonal cover code sequences, M is a spreading factor of the orthogonal cover code sequence as a spreading sequence, N≦M, j is an integer satisfying 1≦j≦N/2, and m is an integer satisfying 1≦m≦M/2;
• perform column mirroring on the first group of orthogonal cover code sequences, so as to generate a second group of orthogonal cover code sequences C2;
• perform cyclic shift processing of column vectors on the first group of orthogonal cover code sequences, so as to generate a third group of orthogonal cover code sequences C3;
• perform column mirroring on the third group of orthogonal cover code sequences, so as to generate a fourth group of orthogonal cover code sequences C4;
• and
• a transmitter configured to:
• transmit each of the first group, second group, third group, and fourth group of orthogonal cover code sequences;
• and
• wherein the reception apparatus includes a processor and a receiver configured to:
• receive each of the first group, second group, third group, and fourth group of orthogonal cover code sequences from the transmission apparatus.

A method in a wireless communication system including a transmission apparatus and a reception apparatus, the method comprising:

• generating, by a processor in the transmission apparatus, a first group of orthogonal cover code sequences C1 represented by a matrix of [Cn,1(1), Cn,1(2), . . . Cn,1(M)], which satisfy that any adjacent truncated sub cover code sequences [C2j-1(2m−1), C2j-1,1(2m)] and [C2j,1(2m−1), C2j,1(2m)] are also mutually orthogonal, wherein n is an index of N orthogonal cover code sequences included in the first group of orthogonal cover code sequences, M is a spreading factor of the orthogonal cover code sequence as a spreading sequence, N≦M, j is an integer satisfying 1≦j≦N/2, and m is an integer satisfying 1≦m≦M/2;
• performing, by the processor in the transmission apparatus, column mirroring on the first group of orthogonal cover code sequences, so as to generate a second group of orthogonal cover code sequences C2;
• performing, by the processor in the transmission apparatus, cyclic shift processing of column vectors on the first group of orthogonal cover code sequences, so as to generate a third group of orthogonal cover code sequences C3;
• and
• performing, by the processor in the transmission apparatus, column mirroring on the third group of orthogonal cover code sequences, so as to generate a fourth group of orthogonal cover code sequences C4;
• transmitting, by a transmitter in the transmission apparatus, each of the first, second, third, and fourth orthogonal cover code sequences;
• and
• receiving, by a processor and a receiver in the reception apparatus, each of the first group, second group, third group, and fourth group of orthogonal cover code sequences from the transmission apparatus.