US 10,998,932 B2Granted

Use of vectoring and time- and/or frequency—division multiple access in a multi-user connection

AssigneeNokia Solutions and Networks Oy

InventorsPaschalis Tsiaflakis, Carl Nuzman

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Abstract

A multi-line digital transceiver configured to use digital signal vectoring in a manner that causes effects of crosstalk between distinct groups of subscriber lines to be effectively mitigated, without directly attempting to mitigate effects of crosstalk within any one of those distinct groups. In an example embodiment, effects of crosstalk within each of the distinct groups can be mitigated indirectly using an appropriate T/FDMA schedule, according to which, during a given symbol period, a given resource block of any of the distinct groups can carry data corresponding to a single respective subscriber. A precoder (postcoder) matrix for the digital signal vectoring can be generated using block-diagonalization techniques appropriately constrained, e.g., using the groups' definitions, aggregate-transmit-power restrictions, etc. In various embodiments, the disclosed digital signal vectoring can be used on the downlink or on the uplink, or both.

Claims18

Dependent claims

An apparatus comprising a data transmitter that comprises an analog front end connectable to proximal ends of a plurality of subscriber lines and a digital signal processor configured to process digital samples corresponding to a plurality of distinct groups of output signals and to drive the analog front end to cause the plurality of distinct groups of output signals to be transmitted on the subscriber lines using frequency-division multiplexing, with each of the distinct groups of the output signals being transmitted on a corresponding distinct group of the subscriber lines, at least one of the distinct groups of the subscriber lines including at least two of the subscriber lines;

wherein the digital signal processor comprises a vector processor configured to precode the digital samples in a manner that causes effects of crosstalk between the distinct groups of the subscriber lines to be substantially mitigated at distal ends of the plurality of subscriber lines;
wherein the vector processor is further configured to precode the digital samples in a manner that causes each of the distinct groups of the output signals to convey a different respective data block to the distal ends of the corresponding distinct group of the subscriber lines, said different respective data block being conveyed to each of the distal ends of the corresponding distinct group of the subscriber lines;
and
wherein the apparatus further comprises a scheduler configured to control flows of data through the digital signal processor such that, during a given symbol period, a given resource block of any of the distinct groups of the output signals carries data corresponding to a single respective subscriber.

1 more element

An apparatus comprising a data receiver that comprises an analog front end and a digital signal processor configured to process digital samples corresponding to a plurality of input signals received by the analog front end at input ports connectable to proximal ends of a corresponding plurality of subscriber lines, the input signals being received in response to data signals applied to distal ends of the subscriber lines, the data signals having been encoded with data using frequency-division multiplexing;

wherein the digital signal processor comprises a vector processor configured to postcode the digital samples in a manner that causes effects of crosstalk between distinct groups of the subscriber lines to be substantially mitigated, at least one of said distinct groups including at least two of the subscriber lines;
wherein the vector processor is further configured to postcode the digital samples in a manner that causes each distinct group of the data signals to convey the data thereof to a different respective data block formed by the vector processor, each of said distinct groups of the data signals being applied to the distal ends of a corresponding one of said distinct groups of the subscriber lines;
and
wherein the apparatus further comprises a scheduler configured to control flows of data through the digital signal processor such that, during a given symbol period, a given resource block of any of the distinct groups of the data signals carries data corresponding to a single respective subscriber.

1 more element

Dependencies are inferred from the claim text.