Patent ID: 8300582

Claim:
An apparatus for wireless communication, comprising: at least one processor configured to: receive at a user equipment (UE) a data transmission sent to multiple UEs with spatial division multiple access (SDMA); process the data transmission to recover data sent to the UE; determine acknowledgement (ACK) information for the recovered data; determine ACK resources for the data transmission, the ACK resources including a plurality of subframes, wherein each subframe includes a plurality of slots, and wherein each slot is divided into a plurality of subcarriers with multiple symbol periods; map the ACK information to a portion of the ACK resources allocated to the UE, wherein the multiple UEs are multiplexed on the ACK resources over both the plurality of subcarriers and multiple symbol periods in the plurality of slots; and perform modulation on the mapped ACK information based on single-carrier frequency division multiplexing (SC-FDM), wherein the multiple UEs are multiplexed on the ACK resources; and a memory coupled to the at least one processor.