Method and apparatus for discrete multitone transmission
AssigneesGlobal Unichip Corporation, Taiwan Semiconductor Manufacturing Company, Ltd.
InventorsWen-Juh Kang, Yu-Chu Chen
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Abstract
A method for discrete multitone (DMT) transmission is disclosed. In the method, a DMT signal is received from a transmission channel. The DMT signal is passed through a time-domain equalizer (TEQ) to obtain an equalized DMT signal. The DMT signal is passed through a target impulse response (TIR) filter to obtain a TIR signal. A mean square error (MSE) of an error signal is obtained from the equalized DMT signal and the TIR signal. A TEQ coefficient vector of the TEQ is iteratively updated based on the MSE of the error signal, a frequency kernel matrix corresponding to the TEQ and a frequency kernel matrix corresponding to the TIR filter.
Claims18
A method for discrete multitone (DMT) transmission, the method comprising:
- receiving a DMT signal from a transmission channel;
- passing the DMT signal through a time-domain equalizer (TEQ) to obtain an equalized DMT signal;
- passing the DMT signal through a target impulse response (TIR) filter to obtain a TIR signal;
- obtaining a mean square error (MSE) of an error signal from the equalized DMT signal and the TIR signal;
- and
- iteratively updating a TEQ coefficient vector of the TEQ based on the MSE of the error signal, a frequency kernel matrix corresponding to the TEQ and a frequency kernel matrix corresponding to the TIR filter;
- wherein the frequency kernel matrix Ωw corresponding to the TEQ is determined as
- Ωw=wlΩwl+whΩwh,
- where Ωwl is a low-frequency kernel matrix corresponding to the TEQ, Ωwh is a high-frequency kernel matrix corresponding to the TEQ, and wl and wh are weighting factors of the low-frequency kernel matrix Ωwl and the high-frequency kernel matrix Ωwh, respectively.
An apparatus for discrete multitone (DMT) transmission, the apparatus comprising:
- a time-domain equalizer (TEQ) configured to pass a DMT signal therethrough to obtain an equalized DMT signal;
- a target impulse response (TIR) filter configured to pass the DMT signal therethrough to obtain a TIR signal;
- an adder configured to generate an error signal from the equalized DMT signal and the TIR signal;
- and
- a processor configured to perform operations comprising:
- obtaining a mean square error (MSE) of an error signal from the equalized DMT signal and the TIR signal;
- determining a frequency kernel matrix Ωw corresponding to the TEQ from the following equation:
- Ωw=wlΩwl+whΩwh,
- where Ωwl is a low-frequency kernel matrix corresponding to the TEQ, Ωwh is a high-frequency kernel matrix corresponding to the TEQ, and wl and wh are weighting factors of the low-frequency kernel matrix Ωwl and the high-frequency kernel matrix Ωwh, respectively;
- and
- iteratively updating a TEQ coefficient vector of the TEQ based on the MSE of the error signal, the frequency kernel matrix corresponding to the TEQ and a frequency kernel matrix corresponding to the TIR filter.
Dependencies are inferred from the claim text.