System and method for high-speed decoding and ISI compensation in a multi-pair transceiver system
First Claim
1. A receiver for demodulating an analog signal transmitted by a remote transmitter over a transmission channel, the analog signal including a first ISI component induced by a characteristic of a pulse shaping filter included in the remote transmitter and a second ISI component induced by a characteristic of the transmission channel, the receiver comprising:
- an analog front end, including an analog-to-digital converter, the analog front end receiving and converting the analog signal to a first digital signal;
an equalizer block coupled to the analog front end to receive the first digital signal, the equalizer block compensating the first ISI component in the first digital signal and outputting a second digital signal; and
a decision feedback sequence estimation block, including an ISI compensation circuit, the ISI compensation circuit receiving the second digital signal outputted by the equalizer bock and compensating the second ISI component in the second digital signal.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and a system for providing ISI compensation to an input signal in a bifurcated manner. ISI compensation is provided in two stages, a first stage compensates ISI components induced by characteristics of a transmitter'"'"'s partial response pulse shaping filter, a second stage compensates ISI components induced by characteristics of a multi-pair transmission channel. First stage ISI compensation is performed in an inverse response filter having a characteristic feedback gain factor K, during system start-up. Second stage ISI compensation is performed by a single DFE in combination with a MDFE operating on tentative decisions output from a Viterbi decoder. As the DFE of the second stage reaches convergence, the feedback gain factor K of the first stage is ramped to zero.
38 Citations
20 Claims
-
1. A receiver for demodulating an analog signal transmitted by a remote transmitter over a transmission channel, the analog signal including a first ISI component induced by a characteristic of a pulse shaping filter included in the remote transmitter and a second ISI component induced by a characteristic of the transmission channel, the receiver comprising:
-
an analog front end, including an analog-to-digital converter, the analog front end receiving and converting the analog signal to a first digital signal;
an equalizer block coupled to the analog front end to receive the first digital signal, the equalizer block compensating the first ISI component in the first digital signal and outputting a second digital signal; and
a decision feedback sequence estimation block, including an ISI compensation circuit, the ISI compensation circuit receiving the second digital signal outputted by the equalizer bock and compensating the second ISI component in the second digital signal. - View Dependent Claims (2, 5, 6, 7, 8, 9)
-
-
3. (canceled)
-
4. (canceled)
-
10. A method for demodulating an analog signal transmitted by a remote transmitter over a transmission channel, the analog signal including a first ISI component induced by a characteristic of a pulse shaping filter included in the remote transmitter and a second ISI component induced by a characteristic of the transmission channel, the method comprising the operations of:
-
(a) receiving the analog signal in an analog front end;
(b) converting the analog signal to a first digital signal;
(c) compensating the first ISI component included in the first digital signal using an equalizer block;
(d) producing a second digital signal, the second digital signal being substantially equal to the first digital signal with the first ISI component substantially compensated;
(e) compensating the second ISI component included in the second digital signal;
(f) producing a third digital signal, the third digital signal being substantially equal to the second digital signal with the second ISI component substantially compensated; and
(g) decoding the third digital signal. - View Dependent Claims (11, 14, 15, 16, 17, 18)
-
-
12. (canceled)
-
13. (canceled)
-
19. A receiver for demodulating an analog signal transmitted by a remote transmitter over a transmission channel, the analog signal including a first ISI component induced by a characteristic of a pulse shaping filter included in the remote transmitter and a second ISI component induced by a characteristic of the transmission channel, the receiver comprising:
-
an analog front end including an analog-to-digital converter, the analog front end receiving the analog signal and outputting a first digital signal;
a first ISI compensation circuit receiving the first digital signal from the analog front end and outputting a second digital signal, the second digital signal being substantially compensated for the first ISI component; and
a second ISI compensation circuit, the second ISI compensation circuit receiving the second digital signal and generating a third digital signal, the third digital signal being substantially compensated for the second ISI component.
-
-
20-28. -28. (canceled)
Specification