Patent ID: 8400978

Claim:
A method of transmitting an uplink signal, the method comprising: mapping information symbols on resource elements in a subframe, wherein the subframe includes two slots and each slot includes a plurality of Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols; mapping reference signal symbols on the resource elements such that the reference signal symbols are present on only one SC-FDMA symbol in each slot; and transmitting the information symbols and the reference signal symbols via the plurality of SC-FDMA symbols at the subframe, wherein rank information symbols of the information symbols are present on a first set of four SC-FDMA symbols and each of the first set of four SC-FDMA symbols is separated from the SC-FDMA symbols for the reference signal symbols by one SC-FDMA symbol, and wherein Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) information symbols of the information symbols are present on a second set of four SC-FDMA symbols and each of the second set of four SC-FDMA symbols is contiguous with the SC-FDMA symbols for the reference signal symbols.