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Apparatus for, and method of, reducing noise in a communications system
| Details |
Inventors: Agazzi, Oscar E.;
Assignee: Broadcom Corporation (Irvine, CA)
Primary Examiner: Patel; Ajit
Assistant Examiner:
Attorney, Agent or Firm: Christie, Parker & Hale, LLP
A communication line having a plurality of twisted wire pairs connects a plurality of transmitters, one transmitter at each end of each twisted wire pair, with a plurality of receivers, one receiver at each end of each twisted wire pair. Each receiver receives a combination signal including a direct signal from the transmitter at the opposite end of the twisted wire pair with which the receiver is associated and a plurality of far-end crosstalk (FEXT) impairment signals, one from each of the remaining transmitters at the opposite end of the communications line. A plurality of FEXT cancellation systems, one associated with each receiver, provides a replica FEXT impairment signal. A device associated with each receiver is responsive to the combination signal received by the receiver and the replica FEXT impairment signal provided by the FEXT cancellation system associated with the receiver for substantially removing the FEXT impairment signals from the combination signal. If necessary, a skew adjuster delays the arrival of the combination signal at the device so that the combination signal and the FEXT impairment signal arrive at the device at substantially the same time. A sequential decoder operates on signals from each of the plurality of wire pairs simultaneously to produce receiver outputs. A plurality of near-end crosstalk (NEXT) cancellation systems and echo cancellers remove NEXT and echo impairment signals from the combination signal. |
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DETAILED DESCRIPTION Briefly, and in general terms, the invention relates to systems for, and methods of, reducing the noise present in the signals received and processed by devices within a communications system and to systems for, and methods of, reducing such noise in communications systems having high throughputs.
In one embodiment, the invention is a communications system including a communication line having a plurality of twisted wire pairs and a plurality of transmitters, one transmitter at each end of each twisted wire pair.
The system also includes a plurality of receivers, one receiver at each end of each twisted wire pair.
Each receiver receives a combination signal including a direct signal from the transmitter at the opposite end of the twisted wire pair with which the receiver is associated and a plurality of far-end crosstalk (FEXT) impairment signals, one from each of the remaining transmitters at the opposite end of the communications line.
Further included in the system are a plurality of FEXT cancellation systems, one associated with each receiver; each FEXT cancellation system provides a replica FEXT impairment signal.
The system also includes a plurality of devices, one associated with each receiver; each device is responsive to the combination signal received by the receiver and the replica FEXT impairment signal provided by the FEXT cancellation system associated with the receiver for substantially removing the FEXT impairment signals from the combination signal.
By providing a plurality of FEXT cancellation devices which generate replica FEXT impairment signals and a plurality of device which combine the replica FEXT impairment signals with the combination signals, the invention substantially cancels the FEXT impairment signals from the combination signal.
Thus signal degradation due to noise in the communications system is reduced and the transmitted information may be more reliably recovered.
In another embodiment, the invention is a method for reducing noise in a communications system
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