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System, apparatus and method for multi-carrier transmission

A transmission device and multi-carrier technology, which can be used in transmission systems, digital transmission systems, and transmission path separation devices, etc., can solve the problems of complicated device structure and increased device cost.

Inactive Publication Date: 2004-06-16
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0039] However, there is a problem that using an echo canceller complicates the structure of the device and makes the cost of the device high

Method used

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  • System, apparatus and method for multi-carrier transmission
  • System, apparatus and method for multi-carrier transmission
  • System, apparatus and method for multi-carrier transmission

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Embodiment Construction

[0156] Referring now to the accompanying drawings, the embodiments of the multi-carrier transmission system, device and method of the present invention will be described in detail. exist Figures 9 to 33 Embodiments of the present invention are described.

[0157] Figure 9 is a block diagram showing an embodiment of the present invention. exist Figure 9 Among them, the multi-carrier transmission system and method of the present invention are applied as an ADSL system. Such as Figure 9 As shown, this embodiment provides an ATU-C (ADSL Transceiver Unit, Central Office) 1, as the Central Office, and an ATU-R (ADSL Transceiver Unit, Remote Terminal) 2, as the Remote Terminal.

[0158] ATU-C1 provides the transmission part 3 and the reception part 5, and ATU-R2 provides the transmission part 6 and the reception part 4, and these parts have important functions respectively. Behind the transmission part 3 of ATU-C1, a high-pass filter 7 is provided to eliminate the side lobe...

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Abstract

A system for multi-carrier transmission which can secure the transmission capacity under the noise environment whose noise changes cyclically is provided. A mapping section in an ATU-C (ADSL transceiver unit, central office end) memorizes the bit allocation allocating to each carrier and transmission power allocation using for each carrier at the period that the noise generated at the data transmission to a downstream direction is large and the bit allocation allocating to each carrier and transmission power allocation using for each carrier at the period that the noise generated at the data transmission to an upstream direction is large. And a demapping section in an ATU-R (ADSL transceiver unit, remote terminal end) also memorizes the memorized bit allocation and transmission power allocation. At the time of the data transmission to the downstream direction, the bit allocation and transmission power allocation is allocated to each carrier of the high frequency band, by making the bit rate at the period that the noise generated at the data transmission to the downstream direction is small higher than the bit rate at the period that the noise is large. With this, the transmission capacity to the downstream direction can be secured.

Description

technical field [0001] The present invention relates to a multi-carrier transmission system, device and method, specifically, it uses a bit allocation switching system and an FDM (Frequency Division Multiplexing) system, and uses multiple The carrier realizes the data transmission. Background technique [0002] Recently, xDSL (Digital Subscriber Line) technology has been the focus of attention, with which high-speed transmission of several Mbit / s is possible via metal cables, such as a loop. Here, the x in xDSL means any of the different types of DSL, and x is denoted by letters such as A, S, V, and H according to its technology. In this technology, the focus of great attention is ADSL (Asymmetric Digital Subscriber Line) technology. This kind of ADSL has different transmission speeds in the uplink and downlink directions, and this asymmetric nature is suitable for Internet access. [0003] This ADSL device functions as a DMT (Discrete Multi-Tone) system as a MODEM (Modul...

Claims

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Application Information

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IPC IPC(8): H04B1/50H04J1/12H04J11/00H04L5/02H04L5/14H04L27/26H04L29/08H04M3/00H04M11/00
CPCH04L5/0007H04L5/006H04L5/0046H04L5/143H04B1/50
Inventor 冈村勇作
Owner NEC CORP