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Discrete multi-audio frequency modulation data transmitting method and system

A data transmission method and technology of a data transmission system are applied in the field of communication, which can solve the problems of constant initial line rate and high transmission bit error rate, and achieve the effects of solving the waste of power resources, reducing the transmission bit error rate, and saving power resources.

Inactive Publication Date: 2007-03-21
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] The present invention provides a method and system for discrete multi-tone modulation data transmission, which is used to solve the problem in the prior art that the initial line rate remains unchanged in the data transmission of discrete multi-tone modulation, resulting in a high transmission bit error rate

Method used

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  • Discrete multi-audio frequency modulation data transmitting method and system
  • Discrete multi-audio frequency modulation data transmitting method and system
  • Discrete multi-audio frequency modulation data transmitting method and system

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Embodiment Construction

[0059] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0060] The core idea of ​​the present invention is to generate a dynamic BIT table at the sending end according to the amount of data to be sent, which is used to carry data on the line. The amount of information, which can save power resources.

[0061] The BIT table is a bit allocation table. DMT (OFDM (Orthogonal frequency division multiplexing)) divides the entire frequency band of the line into several sub-bands (also called TONE), and each sub-band is orthogonal to each other. These sub-frequency bands are used to convey information through existing digital modulation techniques (specifically QAM modulation techniques for xDSL). The modulation technology requires that the amount of information carried by each tone (specifically several bits) be determined according to the noise of each tone and the power to be sent, and a BIT table...

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Abstract

A method for transmitting discrete multiaudio modulated data includes generating the first bit table by sending end according to data to be sent as the first bit table item containing data load information on each line at this time of data sending, modulating data according to the first bit table and sending modulated data to receiving end by sending end, carrying out demodulation according to the first bit table and obtaining relevant data by receiving end.

Description

technical field [0001] The present invention relates to the communication field, in particular to a discrete multi-tone modulation data transmission method and system. Background technique [0002] xDSL is a high-speed data transmission technology transmitted on telephone twisted pair (UTP Unshielded Twist Pair). The xDSL with transmission uses frequency division multiplexing technology to make xDSL and traditional telephone service (POTS) coexist on the same pair of twisted pairs, where xDSL occupies the high frequency band, POTS occupies the baseband part below 4KHz, and the POTS signal and xDSL signal are separated by a splitter . xDSL for passband transmission uses discrete multitone modulation (DMT). The system that provides multiplexDSL access is called DSL access multiplexer (DSLAM), and its system reference model is shown in Figure 1. [0003] When xDSL is turned on, a rate is determined, such as the downlink 2M line rate; or the xDSL transceiver determines a line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M11/06H04Q11/00
CPCH04L5/0007H04L5/006H04L5/0046
Inventor 石清泉
Owner HUAWEI TECH CO LTD
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