Uplink demodulation reference signal design for MIMO transmission

摘要

A base station capable of communicating with a plurality of subscriber stations is provided. The base station transmits control information and data to at least one of the plurality of subscriber stations in a subframe using a subset of antenna ports corresponding to a subset of antenna port numbers. The base station maps reference signals corresponding to the subset of antenna ports according to a transmission rank R. The base station indicates, via a cyclic shift indicator (CSI) field in an uplink grant, an assigned resource index corresponding to the mapped reference signal. The CSI field includes a cyclic shift and an orthogonal cover code (OCC) index. The subscriber station uses a resource mapping table to identify the assigned resource index based on the transmission rank, cyclic shift and OCC index.

主权项

1. A method by a subscriber station, comprising:
receiving a control message from a base station for scheduling an uplink data transmission, the control message comprising a cyclic shift indicator (CSI) field indicating a cyclic shift (CS) and an orthogonal cover code (OCC); and transmitting data and reference signals in response to the control message, the reference signal being acquired based on the indicated cyclic shift and the OCC, wherein in response to the CSI field having a first value among a first subset, an OCC for a first transmission layer is same as an OCC for a second transmission layer, and is different from an OCC for third and fourth transmission layers, and in response to the CSI field having a second value among a second subset, OCCs for all transmission layers are the same, all elements of the second subset being different from all elements of the first subset.