Patent ID: 6760374
Filing Date: 2004-07-06
Classification: H04H,H04L

Abstract:
A method of receiving data transmitted via a dispersive media, comprising the steps of:receiving, by a receiver apparatus, a signal communicated through a dispersive media, the signal comprising an unknown data segment that is preceded by a first known data segment and followed by a second known data segment; generating a replica of the first known data segment and the second known data segment; estimating channel characteristics existing at the time of transmission of the first known data segment by comparing the received first known data segment with its generated replica; estimating channel characteristics existing at the time of transmission of the second known data segment by comparing the received second known data segment with its generated replica; and performing a QR factorization, using the estimation of the channel characteristics existing at the time of transmission of the first known data segment and the estimation of the channel characteristics existing at the time of transmission of the second known data segment and the received signal, to determine the symbols of the unknown data segment, wherein said performing step comprises the steps of, computing the Q and R matrices for determining M1, wherein Q is a unitary matrix, R is an upper triangular matrix, and QÂ·R=M1; extracting the R1 matrix from the R matrix, wherein R1 is the top M rows of R, and wherein M represents the number of unknown data symbols in the unknown data segment; determining the c matrix, wherein c is the top M rows of Q*TC, wherein C is the received signal related to the unknown data segment with intersymbol interference induced by the known data segments removed; and solving R1{circumflex over (B)}=c, for {circumflex over (B)}, using back substitution, wherein {circumflex over (B)} is a vector representing the symbols of the unknown data segment.