Patent ID: 7508751
Filing Date: 2009-03-24
Classification: H04L

Abstract:
1. A method for transmitting uplink fast feedback information using a fast feedback channel in a communication system utilizing an orthogonal frequency division multiple access (OFDMA) scheme, the method comprising the steps of: selecting information data for the uplink fast feedback information; determining a codeword from a pre-determined codeword set corresponding to the selected information data; choosing transmission symbols by performing orthogonal modulation according to the determined codeword based on a predetermined modulation pattern; mapping the chosen transmission symbols into sub-carriers; performing an inverse fast Fourier transform (IFFT) on the mapped symbols; and transmitting the IFFT processed mapped symbols, wherein the determined codeword indicates a set of orthogonal vectors to be used for the orthogonal modulation, and the predetermined modulation pattern is represented by P wherein the set of orthogonal vectors includes 6 orthogonal vectors from among a predetermined orthogonal vector set, the predetermined orthogonal vector set is represented by: where each of the P wherein the pre-determined codeword set is defined by: where a total number of the codewords is 64 expressed by 6 bits, the codewords being designed such that a minimum Hamming distance between the codewords is at least equal to 5, and each of the A