Method and apparatus for fast determination of initial transversal equalizer coefficient values
US4047013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for determining the initial values of the coefficients of a transversal equalizer for a synchronous data transmission system, wherein a training sequence is transmitted to allow the equalizer coefficients to be adjusted to optimum initial values. According to the method, a sequence (v.sub.i) of L elements v.sub.i, having a periodic autocorrelation function, only the first coefficient of which is not zero, is derived from a periodic binary pseudo-random sequence (u.sub.i) of L binary elements u.sub.i having a periodic autocorrelation function, the first coefficient of which is equal to L and each of the other coefficients are equal to -1. Then, the sequence (v.sub.i) is transmitted through the transmission channel and the initial values of the equalizer coefficients are derived from the received sequence. In a preferred embodiment of the invention the initial values of the equalizer coefficients are derived from the received sequence through a direct method which involves the calculation of the autocorrelation matrix of samples of the transmission channel impulse responses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.