Line initialization method and device

Abstract

The invention provides a line initialization method and a device. The method includes: firstly, acquiring, at a downlink direction, a first precoding matrix which is needed by a first part of subcarriers and then sending a plurality of data signals in all the data signals which are needed to be sent in an initialization process through use of only the first part of subcarriers; then acquiring a second precoding matrix which is needed by at least a second part of subcarriers in all the available subcarriers and sending the remaining data signals, excluding the plurality of data signals, in all the data signals through use of at least the second part of subcarriers so that line initialization can be completed. Through the above-mentioned method, crosstalk interference between lines can be eliminated while line initialization can be completed and sending power is less liable to exceed the standard.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a line initialization method and equipment. Background technique [0002] Digital Subscriber Line (DSL) technology is a broadband access technology based on ordinary telephone twisted pair (Unshielded Twist Pair, UTP) as the transmission medium for high-speed data service transmission. Digital subscriber line technology mainly uses frequency division multiplexing technology to enable digital subscriber line services and POTS (Plain Old Telephone Service) to coexist on the same ordinary telephone twisted pair without replacing the existing basic transmission medium. High-speed downlink / uplink transmission rates can be obtained when data transmission is performed through existing common telephone twisted-pair lines. Among them, in the entire transmission frequency band, the POTS service occupies the baseband part below 4KHz, while the digital subscriber line occupies the fr...

AI Technical Summary

Problems solved by technology

[0006] In the long-term research and development process, the inventors of the present application found that when using the above-mentioned Vectoring technology, there are the following technical problems: at the initial stage of line initialization, the non-linear precoding technology cannot be used to precode the signal, and when using linear coding It is easy to cause a significant increase in transmission power

The use of Vectoring technology needs to obtain the crosstalk channel and / or crosstalk cancellation coefficient to precode the signal. The precoding methods mainly include linear precoding and nonlinear precoding. When using the low frequency band to send signals, the linear precoding method can make FEXT is better offset, but as the frequency band increases, the linear precoder will increase the transmission power of the Showtime (transmitting line) port significantly when a new line is added

In general equipment and systems, the transmit power of all ports has an upper limit, so the use of linear precoding may cause the transmit power of the Showtime port to exceed the standard

In order to avoid excessive transmission power while completing crosstalk cancellation, non-linear precoding technology can be used to precode the signal, but this method needs to know all crosstalk channels. At the initial stage of the initialization of the new line, Before the feedback channel of the initialization line is established, it is difficult for the initialization line to feed back the error signal of the downlink channel through the uplink channel, and the crosstalk channel between the Showtime line and the initialization line and the crosstalk channel between the initialization line and the initialization line cannot be known. In the initial stage of initialization, it is impossible to use nonlinear precoding technology to precode the signal to counteract crosstalk interference, while using linear precoding will easily lead to a significant increase in transmission power

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