摘要:
The present invention relates to a method for configuring communication parameters for communication through a first multi-carrier data communication path (DPx) established over a first subscriber line (Lx), and comprising the steps of: detecting a request (init_req, join_req(y)) whereby a second multi-carrier data communication path (DPy) is to be initialized over a second subscriber line (Ly), A method according to the invention further comprises the steps of: postponing initialization of the second data communication path, acquiring crosstalk characteristics (XT_char_xy(k)) from the second subscriber line towards the first subscriber line, deriving from the crosstalk characteristics a parameter value (VN_x(k)) characterizing a virtual noise model used for communication over the first data communication path, and applying the parameter value for further communication over the first data communication path, and resuming initialization of the second data communication path. The present invention also relates to an access node.
摘要:
The present invention relates to a method for configuring communication parameters for communication through a first multi-carrier data communication path (DPx) established over a first subscriber line (Lx), and comprising the steps of: detecting a request (init_req, join_req(y)) whereby a second multi-carrier data communication path (DPy) is to be initialized over a second subscriber line (Ly), A method according to the invention further comprises the steps of: postponing initialization of the second data communication path, acquiring crosstalk characteristics (XT_char_xy(k)) from the second subscriber line towards the first subscriber line, deriving from the crosstalk characteristics a parameter value (VN_x(k)) characterizing a virtual noise model used for communication over the first data communication path, and applying the parameter value for further communication over the first data communication path, and resuming initialization of the second data communication path. The present invention also relates to an access node.
摘要:
The present invention relates to a method for estimating a first parameter (|H12(f)|, arg(H12(f))) that characterizes a first crosstalk channel (XCHDS12) from a first transmission medium (12b) towards a second transmission medium (12a) in a first direction of communication (DS).A method according to the invention further comprises the steps of: estimating a second alike parameter (|G21(f)|, arg(G21(f))) that similarly characterizes a second crosstalk channel (XCHUS21) from the second transmission medium towards the first transmission medium in a second opposite direction of communication (US) and at a first frequency index (f1), thereby yielding a first parameter value (|G21(f1)|, arg(G21(f1))), estimating the second parameter at a second distinct frequency index (f2), thereby yielding a second parameter value (|G21(f2)|, arg(G21(f2))), deriving a value (|H12(f3)|, arg(H12(f3))) for the first parameter at a third distinct frequency index (f3) from the first parameter value and the second parameter value. The present invention also relates to a crosstalk estimation unit, and to an access multiplexer or a network analyzer including such a crosstalk estimation unit.
摘要:
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.
摘要:
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.
摘要:
A network includes an access link and a local area link. The access link and the local area link are interferingly coupled. A method for performing spectrum management in view of a constraint in the network includes quantifying interference between the access link and the local area link, determining a first spectral configuration for a first transmitter operating over the access link, and determining a second spectral configuration for a second transmitter operating over the local area link. The determining of the first spectral configuration and the determining of the second spectral configuration are performed such that the respective achievable channel capacities of the access link and the local area link meet the constraint.
摘要:
The present invention relates to a device (108, 109, 110) comprising an interface to at least one active subscriber line (112) and an interface to at least one inactive subscriber line (111). The device (108, 109, 110) comprises means for transmitting a first signal on the inactive subscriber line (111) and means for synchronously measuring crosstalk (130; 201, 203, 205, 207) induced into the active subscriber line (112) by transmitting the first signal on the inactive subscriber line (111).
摘要:
The present invention relates to a crosstalk estimation device for estimating crosstalk between disturber communication lines and victim communication lines. The crosstalk estimation device is able to change the power spectral density PSD on the victim communication lines and/or the disturber communication lines. The crosstalk estimation device further receives measured changes in operational parameters on the victim communication lines and/or disturber communication lines in order to estimate the crosstalk induced in the victim communication lines and/or disturber communication lines.
摘要:
The present invention relates to a device (108, 109, 110) comprising an interface to at least one active subscriber line (112) and an interface to at least one inactive subscriber line (111). The device (108, 109, 110) comprises means for transmitting a first signal on the inactive subscriber line (111) and means for synchronously measuring crosstalk (130; 201, 203, 205, 207) induced into the active subscriber line (112) by transmitting the first signal on the inactive subscriber line (111).