Linear-equivalent echo and next cancellers for Tomlinson-Harashima Precoding (THP) systems

• US 8,279,783 B1
• Filed: 08/09/2006
• Issued: 10/02/2012
• Est. Priority Date: 08/12/2005
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Aquantia Corporation (Marvell Technology Group Limited)
• Inventors: Sederat, Hossein, Bates, Stephen
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Cattungal, Ajay
• Application Number:
  US11/501,324
• Time in Patent Office: 2,246 Days
• Field of Search: 370/286, 370/289, 370/352, 370/465, 370/466, 370/522, 375/220, 375/222, 375/229, 375/233, 375/232, 375/267, 375/289, 375/296, 375/317, 375/346, 375/355
• US Class Current: 370/286
• CPC Class Codes: H04B 3/04 Control of transmission; Equalising
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04B 3/487 Testing crosstalk effects

Abstract

In one implementation, a transceiver is provided that includes a precoder to pre-equalize a data signal transmitted from the transceiver. The transceiver further includes an interference cancellation system to substantially cancel interference from a data signal received by the transceiver. The precoder and the interference cancellation system share at least one common input signal.

Claims

1. A transceiver comprising:

a non-linear precoder that implements Tomlinson-Harashima Precoding (THP) to pre-equalize a data signal transmitted from the transceiver; and

an interference cancellation system including an echo canceller to substantially cancel interference from a data signal received by the transceiver;

wherein the non-linear precoder and the interference cancellation system share at least one common input signal, and where inputs to the echo canceller are given by inputs to the nonlinear precoder and modulo wrap values.

2. The transceiver of claim 1, wherein the interference cancellation system further comprises a Near-End Cross Talk (NEXT) canceller.

3. The transceiver of claim 1, wherein the echo canceller comprises one or more adaptive filters for generating a signal to mimic echo within a data signal received by the transceiver.

4. The transceiver of claim 3, further comprising a subtractor to subtract the signal generated by the one or more adaptive filters from the data signal received by the transceiver to substantially remove echo from the received data signal.

5. A method comprising:

pre-equalizing a data signal transmitted from a transceiver using a non-linear precoder in accordance with Tomlinson-Harashima Precoding (THP); and

substantially cancelling interference from a data signal received by the transceiver using an interference cancellation system including an echo canceller,

wherein the non-linear precoder and the interference cancellation system share at least one common input signal, and where inputs to the echo canceller are given by inputs to the nonlinear precoder and modulo wrap values.

6. The method of claim 5, wherein the interference cancellation system further comprises a Near-End Cross Talk (NEXT) canceller.

7. The method of claim 5, wherein substantially cancelling interference from a data signal comprises generating a signal to mimic echo within a data signal received by the transceiver using one or more adaptive filters associated with the echo canceller.

8. The method of claim 7, further comprising subtracting the signal generated by the one or more adaptive filters from the data signal received by the transceiver to substantially remove echo from the received data signal.