Patent ID: 6952444
Filing Date: 2005-10-04
Classification: H04L

Abstract:
1. A communication receiver, comprising: an input for receiving a modulated analog signal containing digital information; a front end unit operable for performing analog-to-digital conversion, for performing demodulation and for performing timing control, and further operable for producing a demodulated complex-valued digital signal from the modulated analog signal; a digital equalizer connected for receiving the demodulated complex-valued digital signal, comprising: a symbol-to-bit converter connected to the second filter; wherein the second filter further comprises an M-tap FIR filter whose taps are adjusted according to the following formula: where c n [m] is the m-th tap of the second filter after calculation of n outputs, s 3 [n] is the input sequence to the second filter, s 5 [n] is the sum of the output of the second filter and a decision feedback filter, and φ n ) is a complex-valued function, whose parameters may depend upon a symbol index n; and the decision feedback filter is an N-tap backward FIR filter whose taps are adjusted according to the following formula: where d n [i] is the i-th tap of the decision feedback filter after calculation of n outputs, â[n] is a sequence of detected data, and Ψ n (.) is a complex-valued function, whose parameters may depend on the symbol index n.