Patent ID: 8804686
Filing Date: 2014-08-12
Classification: H04B,H04L

Abstract:
1. A method, implemented in a wireless device, for transmitting reference signals, wherein each of a plurality of available reference signals is defined by a cyclic shift and a corresponding orthogonal cover code, the method comprising: receiving a signal including a pattern index of B bits for identifying at least one reference signal for use by the wireless device in transmissions; and using the pattern index to identify the cyclic shift and orthogonal cover code to be used in transmitting each of one or more spatially multiplexed data streams, according to one or more pre-determined tables that map each value of the pattern index to a pattern of cyclic shift and orthogonal cover code combinations for a first multi-layer transmission scenario, wherein the patterns define mappings of orthogonal cover codes and cyclic shifts to transmission layers as a function of the pattern index and wherein the patterns for the first multi-layer transmission scenario include a first pattern based on a set of cyclic shifts and a second pattern based on the same set of cyclic shifts, wherein each cyclic shift in the set is associated with a corresponding orthogonal cover code in the first pattern and wherein some, but not all, of the cyclic shifts in the set are associated with the same corresponding orthogonal cover codes in the second pattern; and transmitting each of the one or more spatially multiplexed data streams using the identified reference signal corresponding to each data stream.