Method for decoding and of joint equalization of a digital signal protected by a code defined by a trellis
US7012976B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Mar 14, 2006 |
| Priority date | — |
| Expiry date | Oct 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0054
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention concerns a method for jointly decoding and equalizing a digital signal protected by a trellis-defined code and transmitted though a channel. The method consists in carrying out a maximum likelihood estimate of each current bit xn by minimizing the quadratic error between the observed symbol Vn and the current symbol in the channel output zn, the quadratic error being calculated (1002) from the set of observed symbols based on the branch metric of the last transition en1(X)→en(X) according to the relationship (I); wherein k represents the rank of the coefficients of transverse filtering introduced by the radioelectric channel. The branch metric is calculated by backtracking through the successive states and the error propagating process is inhibited (1003) while backtracking through the successive states by storing at each node S survivors and by updating each survivor at the next time. The final survivor of the least metric is determined (1004) and the sequence of bits is read by backtracking through the successive nodes. The invention is applicable to ATM radio transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.