A signal processing method, device and system

Abstract

Provided is a signal processing method, comprising: dividing a frequency band for sending a downlink synchronization symbol into at least two parts of non-overlapping frequency bands, the two parts of frequency bands being a first frequency band and a second frequency band; allocating frequency points on the first frequency band and the second frequency band to a sounding sub-carrier and a markup sub-carrier, so that the sounding sub-carrier and the markup sub-carrier distributed on the second frequency band are respectively symmetric with the sounding sub-carrier and the markup sub-carrier distributed on the first frequency band based on a symmetry point, the symmetry point being the lowest frequency point of the second frequency band, the highest frequency point of the first frequency band or one frequency point between the lowest frequency point of the second frequency band and the highest frequency point of the first frequency band; and modulating a downlink pilot frequency sequence onto the sounding sub-carrier on the first frequency band and the second frequency band and then sending same to an opposite-end device. Also provided are a signal processing apparatus and a network system.

Description

technical field [0001] The present invention relates to the field of data communication, in particular to a signal processing method, device and system. Background technique [0002] Digital Subscriber Line (DSL, Digital Subscriber Line) technology is a high-speed data transmission technology transmitted on a telephone twisted pair, such as an unshielded twisted pair (UTP, Unshielded Twist Pair). DSL technologies include Asymmetrical Digital Subscriber Line (ADSL), Very-high-bit-rate Digital Subscriber Line (VDSL), Very-high-bit-rate Digital Subscriber Line 2 (Very-high-bit- rate Digital Subscriber Line 2, VDSL2) and single-pair High-bit-rate Digital Subscriber Line (Single-pair High-bit-rate Digital Subscriber Line, SHDSL), etc. The device that provides multiple DSL access for Customer Premises Equipment (CPE) is called DSL Access Multiplexer (DSL Access Multiplexer, DSLAM), and its system connection relationship is as follows: figure 1 shown. [0003] At present, the in...

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Problems solved by technology

[0003] At present, the industry has also begun to discuss the definition and technology of the next-generation VDSL. The original VDSL2 spectrum with a maximum of 17.664MHz has been extended to more than 30MHz. However, the high frequency spectrum will naturally lead to high crosstalk on the line, and the crosstalk in the high frequency band will also increase. It cannot be eliminated directly by the VDSL2 crosstalk elimination method, which will seriously affect the signal transmission on the line

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