Abstract
A transmission apparatus a transmission method a wireless communication system and method. Generate a first group of orthogonal cover code sequences C 1 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; 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.
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