Approach for processing data received from a communications channel to reduce noise power and optimize impulse response length to reduce inter-symbol interference and inter-channel interference
US6996199B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2002 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Mar 28, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03414
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An approach for processing data received from a communications channel that minimizes noise power and optimizes impulse response length to reduce interference, such as from inter-symbol interference (ISI) and inter-channel interference (ICI), is disclosed. For example, finite impulse response (FIR) filtering may be used with FIR coefficients that are determined by optimizing a function of the impulse response length and the noise power. The impulse response length is optimized based on the communications channel transfer function to reduce interference. The noise power is minimized based on the noise covariance as determined using the total noise power density. The approach accounts for noise from a variety of interference sources besides ISI and ICI. The result is a superior equalizer for use in communications receivers employing orthogonal frequency division multiplexing or discrete multitone modulation in communications protocols employing Asymmetric Digital Subscriber Line, G.Lite and Very High Bit Rate DSL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.