Training assisted joint equalization
First Claim
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1. A method of optical communication, implemented at a receiver in an optical communication network, comprising:
- enabling data communication with a transmitter using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage, whereinthe pre-equalization stage includes;
receiving, over an optical channel, an optical signal carrying a first training sequence of symbols, wherein the first training sequence is known a priori to the receiver;
processing the optical signal to estimate an inverse channel response;
communicating the inverse channel response to a transmitter;
the pre-distortion stage includes;
further receiving a second training sequence that is pre-equalized using the inverse channel response;
generating pre-distortion information from the received second training sequence;
transmitting the pre-distortion information to the transmitter; and
the joint equalization stage includes;
receiving a third training sequence that is pre-equalized using the inverse channel response and pre-distorted using the pre-distortion information;
selectively updating, based on an improvement of bit error level, the inverse channel response and the pre-distortion information from the received third training sequence; and
communicating, when updated, the inverse channel response and the pre-distortion information to the transmitter.
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Abstract
Throughput between a transmitter and a receiver is increased by performing a three-stage joint channel optimization in which training sequences are used for calculating a pre-equalization estimate in the first stage, a look up table for pre-distortion in the second stage and a further updating the pre-equalization estimate and the look up table based on a third stage in which the training sequence used for the updating is pre-equalized and pre-distorted using previously calculated values prior to transmitting from the transmitter to the receiver.
73 Citations
29 Claims
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1. A method of optical communication, implemented at a receiver in an optical communication network, comprising:
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enabling data communication with a transmitter using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage, wherein the pre-equalization stage includes; receiving, over an optical channel, an optical signal carrying a first training sequence of symbols, wherein the first training sequence is known a priori to the receiver; processing the optical signal to estimate an inverse channel response; communicating the inverse channel response to a transmitter; the pre-distortion stage includes; further receiving a second training sequence that is pre-equalized using the inverse channel response; generating pre-distortion information from the received second training sequence; transmitting the pre-distortion information to the transmitter; and the joint equalization stage includes; receiving a third training sequence that is pre-equalized using the inverse channel response and pre-distorted using the pre-distortion information; selectively updating, based on an improvement of bit error level, the inverse channel response and the pre-distortion information from the received third training sequence; and communicating, when updated, the inverse channel response and the pre-distortion information to the transmitter. - View Dependent Claims (2, 3, 4, 5)
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6. An optical communication receiver apparatus, comprising:
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one or more memories holding data and instructions; a processor that reads the instructions and implements a receiver-side method of enabling data communication with a transmitter using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage;
the instructions comprising;instructions for executing the pre-equalization stage by; receiving, over an optical channel, an optical signal carrying a first training sequence of symbols, wherein the first training sequence is known a priori to the receiver; processing the optical signal to estimate an inverse channel response; communicating the inverse channel response to a transmitter; instructions for executing the pre-distortion stage by; further receiving a second training sequence that is pre-equalized using the inverse channel response; generating pre-distortion information from the received second training sequence; transmitting the pre-distortion information to the transmitter; and instructions for executing the joint equalization stage by; receiving a third training sequence that is pre-equalized using the inverse channel response and pre-distorted using the pre-distortion information; selectively updating, based on an improvement of bit error level, the inverse channel response and the pre-distortion information from the received third training sequence; and communicating, when updated, the inverse channel response and the pre-distortion information to the transmitter. - View Dependent Claims (7, 8, 9, 10)
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11. A method of optical communication, implemented at a transmitter in an optical communication network, comprising:
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enabling data communication with a receiver using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage, wherein the pre-equalization stage includes; transmitting, over an optical channel, an optical signal carrying a first training sequence of symbols; receiving an estimate of an inverse channel response; storing the estimate of the inverse channel response at the transmitter; the pre-distortion stage includes; pre-equalizing and transmitting a second training sequence using the estimate of the inverse channel response; receiving pre-distortion information generated based on the second training sequence; and storing the pre-distortion information at the transmitter; and the joint equalization stage includes; jointly performing pre-distortion and pre-equalization of a third training sequence using the estimate of the inverse channel response and the pre-distortion information to generate a pre-distorted and pre-equalized third training sequence; transmitting the pre-distorted and pre-equalized third training sequence over the optical channel; and receiving, based on the pre-distorted and pre-equalized third training sequence, updating information for updating the estimate of the inverse channel response and the pre-distortion information stored at the transmitter. - View Dependent Claims (12, 13, 14, 15)
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16. An optical communication transmission apparatus, comprising:
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one or more memories holding data and instructions; a processor that reads the instructions and implements a method of enabling data communication using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage; the instructions comprising; instructions for implementing the pre-equalization stage includes; transmitting, over an optical channel, an optical signal carrying a first training sequence of symbols; receiving an estimate of an inverse channel response; storing the estimate of the inverse channel response at the transmitter; instructions for implementing the pre-distortion stage by; pre-equalizing and transmitting a second training sequence using the estimate of the inverse channel response; receiving pre-distortion information generated based on the second training sequence; and storing the pre-distortion information at the transmitter; and instructions for implementing the joint equalization stage by; jointly performing pre-distortion and pre-equalization of a third training sequence using the estimate of the inverse channel response and the pre-distortion information to generate a pre-distorted and pre-equalized third training sequence; transmitting the pre-distorted and pre-equalized third training sequence over the optical channel; and receiving, based on the pre-distorted and pre-equalized third training sequence, updating information for updating the estimate of the inverse channel response and the pre-distortion information stored at the transmitter. - View Dependent Claims (17, 18, 19, 20)
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21. An optical communication system comprising a transmission apparatus and a receiver apparatus communicatively coupled to each other through an optical communication channel, wherein the transmission apparatus implements a method comprising:
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enabling data communication with the receiver apparatus using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage, wherein the pre-equalization stage includes; transmitting, over an optical channel, an optical signal carrying a first training sequence of symbols; receiving an estimate of an inverse channel response; storing the estimate of the inverse channel response at the transmitter; the pre-distortion stage includes; pre-equalizing and transmitting a second training sequence using the estimate of the inverse channel response; receiving pre-distortion information generated based on the second training sequence; and storing the pre-distortion information at the transmitter; and the joint equalization stage includes; jointly performing pre-distortion and pre-equalization of a third training sequence using the estimate of the inverse channel response and the pre-distortion information to generate a pre-distorted and pre-equalized third training sequence; transmitting the pre-distorted and pre-equalized third training sequence over the optical channel; and receiving, based on the pre-distorted and pre-equalized third training sequence, updating information for updating the estimate of the inverse channel response and the pre-distortion information stored at the transmitter; and the receiver apparatus implements a method comprising; enabling data communication with the transmitter apparatus using a jointly equalized signal using three stages of optimization comprising a pre-equalization stage followed by a pre-distortion stage followed by a joint equalization stage, wherein the pre-equalization stage includes; receiving, over an optical channel, an optical signal carrying a first training sequence of symbols, wherein the first training sequence is known a priori to the receiver; processing the optical signal to estimate an inverse channel response; communicating the inverse channel response to the transmitter apparatus; the pre-distortion stage includes; further receiving a second training sequence that is pre-equalized using the inverse channel response; generating pre-distortion information from the received second training sequence; transmitting the pre-distortion information to the transmitter; and the joint equalization stage includes; receiving a third training sequence that is pre-equalized using the inverse channel response and pre-distorted using the pre-distortion information; selectively updating, based on an improvement of bit error level, the inverse channel response and the pre-distortion information from the received third training sequence; and communicating, when updated, the inverse channel response and the pre-distortion information to the transmitter apparatus. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification