FEXT estimation and signaling in vector transmission
View Patent ↗Embodiments related to FEXT estimation and signaling in vectored systems are described and depicted herein.
1. A device comprising:
an input to receive from a first transmitter via a channel of a vectored system signals representing a plurality of synchronization symbols, the plurality of synchronization symbols being based on a modulation with an orthogonal sequence;
a first entity to detect a modification of at least a part of the synchronization symbols compared to an expected synchronization symbol sequence; and
a second entity to determine a slicer error information of the received plurality of synchronization symbols by comparing the received signals to a reference, the second entity being configured to modify the reference, when the modification of at least a part of the synchronization symbols is detected;
a third entity to determine that a flag has been transmitted based on the detection of a modification of at least part of the synchronization symbols.
2. The device according to claim 1 , wherein the second entity is configured to change from a predetermined first reference sequence to a modified second reference sequence when the modification of at least a part of the synchronization symbols is detected, wherein the first and second reference sequences are based on an orthogonal sequence.
3. The device according to claim 1 , wherein the second entity is configured to reverse the constellation points of the first reference sequence when the modification of at least a part of the synchronization symbols is detected.
4. The device according to claim 1 , wherein the second entity is configured to shift the constellation points of the first reference sequence when the modification of at least a part of the synchronization symbols is detected.
5. A vectored communication system, the vectored communication system comprising:
a first device, the first device comprising:
a first entity configured to generate a plurality of synchronization symbols to be transmitted to a receiver via a channel of a plurality of channels of a vectored system, the plurality of synchronization symbols being based on a multiplication with an orthogonal sequence; and
a second entity configured to modify at least a part of the plurality of synchronization symbols in order to signal a flag to the receiver; and
a second device, the second device comprising:
an input configured to receive from the first device signals representing the plurality of synchronization symbols,
a third entity configured to detect a modification of at least a part of the synchronization symbols compared to an expected synchronization symbol sequence; and
a fourth entity to determine a slicer error information of the received plurality of synchronization symbols by comparing the received signals to a reference, the fourth entity being configured to modify the reference, when the modification of at least a part of the synchronization symbols is detected; and
a fifth entity to determine that a flag has been received based on the detection of a modification of at least part of the synchronization symbols.