Patent ID: 8254486
Filing Date: 2012-08-28
Classification: H04B,H04L

Abstract:
1. A method comprising: at a base station supporting both multi-user multiple input multiple output (MU-MIMO) and single user multiple input multiple output (SU-MIMO) using a multi-resolution codebook comprising a first codebook and a second codebook, receiving first channel feedback from a first wireless device implementing said MU-MIMO, said first channel feedback describing a downlink channel from said base station to said first wireless device, wherein said first channel feedback is quantized using said first codebook; pre-coding first data for transmission to said first wireless device, using said first channel feedback; receiving second channel feedback at said base station from a second wireless device implementing said SU-MIMO, said second channel feedback describing a downlink channel from said base station to said second wireless device, wherein said second channel feedback is quantized using said second codebook, and said second codebook is smaller than, and a subset of, said first codebook; and pre-coding second data for transmission to said second wireless device, using said second channel feedback.