Nokia Solutions and Networks Oy

Nokia Technologies Oy

Wouter Lanneer

Werner Coomans

Paschalis Tsiaflakis

Yannick Lefevre

Apparatus, methods and computer programs are provided for reducing echo in microphone signals. The apparatus can be configured to obtain an echo path delay estimate and obtain information indicative of a number of future frames used by an acoustic echo cancellation filter. The apparatus can also be configured to obtain information indicative of a time shift between consecutive frames processed by the acoustic echo cancellation filter. The apparatus can also be configured to determine at least a first delay to be added to a loudspeaker signal and determine at least a second delay to be added to a microphone signal. The determination of the first delay and the second delay is based on the echo path delay estimate, the number of future frames and the time shift between consecutive frames processed by the acoustic echo cancellation filter.

Apparatus, methods and computer programs for reducing echo

The method includes sending a first frame of a first modulation format that is suitable for a first group of receivers before sending a second frame of a second modulation format that is suitable for a second group of receivers, wherein the first modulation format is a higher modulation format than the second modulation format, and wherein the method further includes inserting into the first frame at least one symbol of the second modulation format at at least one outer edge of the first frame.

Apparatus and a method for transmitting and receiving in a passive optical network

Example embodiments describe means () for performing i) pre-compensating (, N sets of Ktone data values () for crosstalk between N communication lines; the N sets of Ktone data values pertaining to respective N terminal nodes of a digital communication system; ii) calculating () from the pre-compensated N sets of Ktone data values () N sets of first time domain symbols (); iii) calculating () a second time domain symbol () from a set of Ktones values (); the Ktone data values pertaining to a selected one of the N terminal nodes; and iv) adding () the second time domain symbol in a weighted manner to the first time domain symbols such that the second time domain symbol is added to the first time domain symbol for the selected terminal node and to at least one other of the first time domain symbols for the respective other terminal nodes.

Discontinuous time-frequency operation

The present disclosure relates to an equalizer training unit for deriving equalization parameters for compensating data-dependent distortion in received samples by use of a training sequence including a sequence p&#x3e;1 times and cyclically comprising N sub-sequences of respective combinations of L time-domain symbols of a modulation scheme, wherein the N sub-sequences are cyclically arranged in a selected order and such that L&#x2212;1 symbols of a respective sub-sequence overlap with symbols in the preceding and following sub-sequences. The present disclosure further relates to a training sequence generator unit for generative the training sequence and an equalizer employing the equalizer training unit.

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Antwerp, Belgium

Wouter Lanneer