Patent ID: 7729234
Filing Date: 2010-06-01
Classification: H04L

Abstract:
1. A method for transmitting uplink control information using an ACK channel in a communication system based on an orthogonal frequency division multiple access scheme, the method comprising the steps of: receiving data bits of the uplink control information; outputting transmit symbols of sub-carriers by performing orthogonal modulation with respect to symbols for codewords of the received data bits; and inverse fast fourier transforming and transmitting a transmit signal including bundles of sub-carriers being allocated the modulated transmit symbols, wherein performing the orthogonal modulation includes: performing orthogonal modulation with respect to symbols to be allocated to a bundle of some sub-carriers of the ACK channel according to preset transmit symbol values; performing orthogonal modulation with respect to symbols to be allocated to a bundle of remaining sub-carriers of the ACK channel by sign-inverting preset transmit symbol values; and allocating modulated symbols to the bundles of the sub-carriers to be transmitted, wherein the codewords are preset in such a manner that a Hamming distance becomes maximized with respect to each bundle of the sub-carriers through M-ary channel encoding, wherein the sign inversion is omitted and is used for transmitting random patterns, and wherein the orthogonal modulation includes: performing orthogonal modulation with respect to symbols to be allocated to a bundle of some subcarriers of the ACK channel according to preset transmit symbol values; performing orthogonal modulation with respect to symbols to be allocated to a bundle of remaining subcarriers of the ACK channel by performing phase change with respect to present transit symbol values; and allocating the modulated symbols to the bundles of the subcarriers to be transmitted.