Patent ID: 6757339
Filing Date: 2004-06-29
Classification: H04L

Abstract:
A method of estimating a transmitted sequence of symbols s from a received sequence of signal samples x, each symbol in the transmitted sequence of symbols being one of a set of discrete possible symbol values, the received sequence of signal samples being a combination of noise having a covariance matrix represented as Rnn and of the transmitted sequence of symbols propagating along a plurality of paths, the plurality of paths having a matrix of channel impulse response coefficients represented as A, the method comprising the steps of:determining a lower triangular matrix L from the relationship LLH=AHRnnâˆ’1A+I where LH is the Hermitian of L, AH is the Hermitian of A, and I is an identity matrix; calculating a vector z=Lâˆ’1AHRnnâˆ’1x; and determining an estimated sequence of symbols {circumflex over (s)} belonging to the set of discrete possible symbol values such that the square of the magnitude of a difference vector LH{circumflex over (s)}âˆ’z is minimized.