Patent ID: 8909156

Claim:
A method for operating a user equipment (UE) device, the method comprising: transmitting a first sequence of precoding matrix indicators (PMIs) to a first base station, wherein each of the PMIs of the first sequence indicates a respective selection of a row from a first subset of a codebook, wherein the codebook includes both constant modulus codewords and antenna selection codewords, wherein the first subset includes only the constant modulus codewords; receiving first signals from the first base station, wherein the first signals have been precoded by the first base station using at least a first codeword selected from the first subset; transmitting a second sequence of PMIs to a second base station, wherein each of the PMIs of the second sequence indicates a respective row from a second subset of the codebook, wherein the second subset includes only the antenna selection codewords; receiving second signals from the second base station, wherein the second signals have been precoded by the second base station using at least a second codeword selected from the second subset.