公开(公告)号：US09667458B1

公开(公告)日：2017-05-30

申请号：US14729308

申请日：2015-06-03

Applicant: QUALCOMM Incorporated

Inventor： Georg Frank ,  Nicola Varanese

IPC: H04K1/10 ,  H04L27/28 ,  H04L27/22 ,  H04L27/26

CPC classification number: H04L27/22 ,  H04L27/0014 ,  H04L27/2653 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2679 ,  H04L27/2688 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0046 ,  H04L2027/0067

Abstract: A device may demodulate a set of OFDM data-pilot symbols and select a subset of based at least in part on the position of each data pilot on a constellation map (e.g., how close the data pilot symbol is to an actual constellation point). The device may then perform a data-pilot-based phase estimation based at least in part on the selected subset. The device may also reduce the number of data pilots by partitioning a set of subcarriers into groups and selecting a representative subcarrier from each group. The phase estimation may then be based on the data pilots received on the selected subcarriers. In some cases, the device may also generate a smooth phase signal based on a linear regression algorithm including a phase averaging and a phase offset estimation and perform the phase estimation using the smooth phase signal.