System and method for joint coding and decision feedback equalization
US6012161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1997 |
| Grant date | Jan 4, 2000 |
| Priority date | — |
| Expiry date | Nov 26, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/41
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to joint decision feedback equalization and error correction decoding. To minimize error propagation, the invention uses a combination of enhanced soft decisions and delayed tentative hard decisions from the error correction (Viterbi) decoder to cancel intersymbol interference. Soft decisions are obtained by passing the DFE output through a hyperbolic arc tangent (soft) nonlinear device. These are used to suppress intersymbol interference (ISI) due to multipath with small delays. Tentative hard decisions from a Viterbi decoder are used to cancel ISI due to multipath with large delays, thus remedying the increasing effect of error propagation in channels with large delay spreads. When further combined with antenna diversity and a reduced-complexity DFE concept with adaptive feedforward tap assignment, the invention provides high packet throughput against Rayleigh fading, severe delay spreads, and high Doppler rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.