Patent ID: 7590045

Claim:
An apparatus for transmitting uplink fast feedback information in a wireless communication system, the apparatus comprising: a channel encoder for inputting uplink fast feedback information to transmit, and outputting 3-bit codewords being set according to the fast feedback information; a noncoherent modulator for modulating transmission symbols corresponding to the codewords using a noncoherent modulation scheme; and an inverse fast Fourier transform (IFFT) unit for generating a transmission signal comprised of subcarrier bundles by IFFT-processing the modulated transmission symbols before transmission, wherein the 3-bit codewords are represented as 3-bit payloads as follows: Fast Feedback Vector Index per Tile Even = {tile (0), tile (2), tile (4)}, 3 bit payload Odd = {tile (1), tile (3), tile (5)} 0b000 0, 0, 0 0b001 1, 1, 1 0b010 2, 2, 2 0b011 3, 3, 3 0b100 4, 4, 4 0b101 5, 5, 5 0b110 6, 6, 6 0b111 7, 7, 7 wherein the fast feedback vector index is represented as a vector index as follows: Subcarrier modulation per codeword VECTOR INDEX subcarrier 0, subcarrier 1, . . . , subcarrier 7 0 P0, P1, P2, P3, P0, P1, P2, P3 1 P0, P3, P2, P1, P0, P3, P2, P1 2 P0, P0, P1, P1, P2, P2, P3, P3 3 P0, P0, P3, P3, P2, P2, P1, P1 4 P0, P0, P0, P0, P0, P0, P0, P0 5 P0, P2, P0, P2, P0, P2, P0, P2 6 P0, P2, P0, P2, P2, P0, P2, P0 7 P0, P2, P2, P0, P2, P0, P0, P2 and wherein orthogonal vectors P0, P1, P2 and P3, each of which indicates a Quadrature Phase Shift Keying (QPSK) modulation symbol, can be expressed by: P ⁢ ⁢ 0 = exp ⁡ ( j · π 4 ) P ⁢ ⁢ 1 = exp ⁡ ( j · 3 ⁢ ⁢ π 4 ) P ⁢ ⁢ 2 = exp ⁡ ( - j · 3 ⁢ ⁢ π 4 ) P ⁢ ⁢ 3 = exp ⁡ ( - j · π 4 ) .