US 2010/0260245 A1 · System and method for low-power echo and next cancellers

Abstract

A method to design low complexity and low power echo and NEXT cancellers based on wordlength reduction technique is presented. A circuit architecture to implement echo and cancellers is also presented. The low complexity and low power design relies on the fact that a TH precoder can be viewed as an IIR filter with an input equal to the sum of the original input to the TH precoder and a compensation signal. The proposed design also relies on the fact that sum of the original input to the TH precoder and the compensation signal has finite levels, which can be represented in less bits than the original input of the echo and NEXT cancellers. An improved design by exploiting the statistics of the compensation signal is also proposed to further bring down the complexity and power consumption of these cancellers.

Claims22

Dependent claims

A communications transceiver comprising:

i). N transmitters, wherein each transmitter contains a precoder,
ii). N receivers, with each receiver comprising:
A plurality of FIR digital filters used for Echo and Near End Crosstalk (NEXT) cancellation, with each FIR digital filter comprising:
(a) Computing the sum of the input to the precoder of a transmitter and the compensation signal generated by the said precoder;
(b) A first encoder coupled to the said sum;
(c) A first FIR digital filter coupled to the output of the said first encoder;
and
(d) A first decoder coupled to the output of the said first FIR filter.

5 more elements

Dependencies are inferred from the claim text.

System and method for low-power echo and next cancellers

Life of this patent

System and method for low-power echo and next cancellers

Life of this patent

Abstract

Claims22