Achilleas Anastasopoulos

US Patent:

7092457, Aug 15, 2006

Filed:

Jan 18, 2001

Appl. No.:

09/765516

Inventors:

Keith M. Chugg - Burbank CA, US
Achilleas Anastasopoulos - Ann Arbor MI, US

Assignee:

University of Southern California - Los Angeles CA

International Classification:

H04L 27/14
H03D 1/00

US Classification:

375324, 375340, 375341

Abstract:

A system for estimating inputs and outputs of a digital transmission system is disclosed. The system includes a receiver front-end configured to receive an observed digital signal in the digital transmission system. The system further includes forward and backward recursion elements, at least one forward channel estimator, at least one backward channel estimator, and a combiner. The forward recursion element is adapted to receive the observed digital signal, and generate a first sequence of soft information by performing a forward recursion. The forward channel estimator is adapted to receive the observed digital signal and the first sequence of soft information, and to estimate channel parameters using the first sequence of soft information. The backward recursion element is adapted to receive the observed digital signal, and generate a second sequence of soft information by performing a backward recursion. The backward channel estimator is adapted to receive the observed digital signal and the second sequence of soft information, and to estimate channel parameters using the second sequence of soft information.