Abstract:
Techniques are disclosed that efficiently obtain channel crosstalk estimates in DSL systems and other communication systems that may include unsynchronized channels. For example, a method includes obtaining a first set of estimated measures of crosstalk for a first portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to a plurality of receivers, and interpolating a second set of estimated measures of crosstalk for a second portion of the plurality of communication channels based on the first set of estimated measures of crosstalk. The first portion of the plurality of communication channels may be a subset of the plurality of communication channels and the second portion of the plurality of communication channels is a remainder of the plurality of communication channels. Each estimated measure of crosstalk may relate to at least one tone associated with at least one of the plurality of communication channels.
Abstract:
Se describen técnicas que obtienen eficazmente estimados de diafonía de canales en sistemas DSL y otros sistemas de comunicación que pueden incluir canales no sincronizados. Por ejemplo, un método incluye obtener un primer conjunto de medidas estimadas de diafonía para una primera porción de una pluralidad de canales de comunicación sobre los cuales se van a transmitir señales de datos desde un transmisor a una pluralidad de receptores; e interpolar un segundo conjunto de medidas estimadas de diafonía para una segunda porción de la pluralidad de canales de comunicación, basada en el primer conjunto de medidas estimadas de diafonía. La primera porción de la pluralidad de canales de comunicación pueden ser un subconjunto de la pluralidad de canales de comunicación y la segunda porción de la pluralidad de canales de comunicación es el resto de la pluralidad de canales de comunicación. Cada medida estimada de diafonía puede relacionarse con al menos un tono asociado con al menos uno de la pluralidad de canales de comunicación.
Abstract:
A method involves performing a plurality of acts. The acts include transmitting a first signal stream to a first channel of a multi-channel communications medium while transmitting a second signal stream to a different second channel of the medium. The second signal stream is substantially temporally correlated to the first signal stream. The method includes receiving an SINR measured at a receiver configured to receive signals from the first channel. The SINR is measured while the receiver received the first signal stream. The method includes determining a channel matrix element between the first and second channels or a ratio of said channel matrix element to a diagonal element of the channel matrix. The act of determining is based on the received SINR.