Modified Tomlinson-Harashima precoding method circuit for infinite impulse response (IIR) channels
US7133465B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 2000 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Jun 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03343
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A precoding circuit for minimizing distortion of an input signal in a communication channel having a compound transfer function in the Z-Domain: H(z)=(1+a1.z−1+a2.z−2+a3.z31 3+ . . . +an.z−n)/(1+b1.z−+b2.z−2+b−3.z−3+ . . . +bp.z−p). A feedback circuit comprises a first FIR filter and a transfer function corresponding to the inverse of a feedforward part of a transfer function of the communication channel. A feedforward circuit comprises a second FIR filter and a transfer function corresponding to the inverse of a feedback part of a transfer function of the communication channel. A first subtracting circuit subtracts a feedback signal of the feedback circuit from a feedforward signal of the feedforward circuit and outputs a difference signal which is added to a transmit end signal by a first adding circuit. The difference signal is also added to the input signal by a second adding circuit, the output from the second adding circuit is fed to a quantizing circuit which outputs a value kM which is subtracted from the input signal by a second subtracting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.