公开(公告)号：AT418195T

公开(公告)日：2009-01-15

申请号：AT03729592

申请日：2003-01-07

Applicant: QUALCOMM INC

Inventor： JAYARAMAN SRIKANT ,  CORBATON IVAN ,  SMEE JOHN

IPC: H03M13/01 ,  H04L1/00 ,  H04B1/7105 ,  H04B1/712 ,  H04L1/02

Abstract: Methods and apparatus are presented herein for determining log likelihood ratios (LLRs) for code symbols. Pilot and code symbols are transmitted over diversity channels, which can be modeled as a slowly time varying system. A formulation for a multipath gain vector is derived herein based on the slowly time varying model. The multipath gain vector is then solved using iterative procedures. Using the solved multipath gain vector, the LLRs for code symbols are computed.