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1.发明授权公开(公告)号：US10998932B2
公开(公告)日：2021-05-04
申请号：US16246989
申请日：2019-01-14
Applicant: Nokia Solutions and Networks OY
Inventor： Paschalis Tsiaflakis , Carl Nuzman
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.
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Patent Agency Ranking
公开(公告)号：US11963111B2
公开(公告)日：2024-04-16
申请号：US18237025
申请日：2023-08-23
Applicant: Nokia Solutions and Networks Oy
Inventor： Hong Yang , Carl Nuzman , Paschalis Tsiaflakis
IPC: H04W52/42 , H04B7/0456 , H04W52/34
CPC classification number: H04W52/42 , H04B7/0456 , H04W52/34
Abstract: An apparatus is disclosed, which may include: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving downlink channel estimates between a plurality of access point (AP) antennas of one or more APs and a plurality of user equipment (UE) antennas of one or more UEs; iteratively updating a set of power allocation weights for the AP antennas using weights extracted from a precoder; computing the precoder based on the received channel estimates and a previous set of power allocation weights; performing the iterative updates until a stopping criterion is reached; and outputting data representative of a precoder computed from the received channel estimates and the updated set of power allocation weights.
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公开(公告)号：US10992341B2
公开(公告)日：2021-04-27
申请号：US16442952
申请日：2019-06-17
Applicant: Nokia Solutions and Networks OY
Inventor： Paschalis Tsiaflakis , Jochen Maes , Werner Coomans , Carl Nuzman
Abstract: A multi-line digital transceiver configured to use low-complexity beamforming on at least some tones to boost effective SNR values for selected subscriber lines. In an example embodiment, the beamforming coefficients can be restricted to one-bit values or two-bit values, e.g., such that the corresponding beamforming computations can be implemented using only sign changes, swaps of the real and imaginary parts, and/or zeroing of some values, and without invoking any full-precision hardware multiplication operations. At least some embodiments can be run on a significantly simpler and/or less powerful vectoring engine than conventional beamforming solutions while still being able to provide nearly optimal beamforming SNR gains. In some embodiments, additional scaling by powers of two may be applied to at least some signals contributing to the beamforming, e.g., to satisfy power constraints for some or all of the subscriber lines.
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4.发明申请公开(公告)号：US20200228161A1
公开(公告)日：2020-07-16
申请号：US16246989
申请日：2019-01-14
Applicant: Nokia Solutions and Networks OY
Inventor： Paschalis Tsiaflakis , Carl Nuzman
IPC: H04B3/32
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.
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公开(公告)号：US10826559B2
公开(公告)日：2020-11-03
申请号：US15980865
申请日：2018-05-16
Applicant: Nokia Solutions and Networks OY
Inventor： Carl Nuzman
Abstract: A multiport FDX data transceiver having (i) digital transmit and receive chains shared by the multiple ports thereof and (ii) a multi-stage echo-cancellation circuit capable of canceling the echo of the transmitted signal that is coupled back into the receive chain through the analog front end of the transceiver. In an example embodiment, the echo-cancellation circuit comprises two stages. The first stage operates to remove a dominant echo signal corresponding to the output signal that is being broadcast on the multiple ports of the transceiver. The second stage operates to remove a residual echo signal typically caused by differences in the pertinent characteristics of the circuits associated with the different ports of the transceiver. In some embodiments, the multi-stage echo-cancellation circuit can be used for training a single-stage echo-cancellation circuit that may be unable to sufficiently quickly converge on an optimal set of filter coefficients on its own.
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公开(公告)号：US20190356353A1
公开(公告)日：2019-11-21
申请号：US15980865
申请日：2018-05-16
Applicant: Nokia Solutions and Networks OY
Inventor： Carl Nuzman
Abstract: A multiport FDX data transceiver having (i) digital transmit and receive chains shared by the multiple ports thereof and (ii) a multi-stage echo-cancellation circuit capable of canceling the echo of the transmitted signal that is coupled back into the receive chain through the analog front end of the transceiver. In an example embodiment, the echo-cancellation circuit comprises two stages. The first stage operates to remove a dominant echo signal corresponding to the output signal that is being broadcast on the multiple ports of the transceiver. The second stage operates to remove a residual echo signal typically caused by differences in the pertinent characteristics of the circuits associated with the different ports of the transceiver. In some embodiments, the multi-stage echo-cancellation circuit can be used for training a single-stage echo-cancellation circuit that may be unable to sufficiently quickly converge on an optimal set of filter coefficients on its own.
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