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Discrete multi-audio frequency modulating system optimal power distributing comprehensive bit position loading method

A technology for discrete multi-tone and modulation systems, which is applied in the field of comprehensive bit loading for optimal power distribution of discrete multi-tone modulation systems, and can solve the problem of reduced computing efficiency, increased computing load, and no optimal power allocation bit loading method, etc. question

Inactive Publication Date: 2007-01-03
TSINGHUA UNIV +1
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AI Technical Summary

Problems solved by technology

This loading method is suitable for systems that do not require a high target bit rate. When the target bit rate is high, the amount of calculation increases significantly, and the calculation efficiency decreases.
For DMT systems with high target bit rate requirements, there is currently no efficient optimal power allocation bit loading method

Method used

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  • Discrete multi-audio frequency modulating system optimal power distributing comprehensive bit position loading method
  • Discrete multi-audio frequency modulating system optimal power distributing comprehensive bit position loading method
  • Discrete multi-audio frequency modulating system optimal power distributing comprehensive bit position loading method

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Embodiment Construction

[0048] The comprehensive bit loading method for optimal power allocation of DMT system is implemented on the digital integrated circuit chip as the bit allocation circuit at the sending end of the DMT system. attached Figure 1 is Schematic block diagram of DMT system sending and receiving. attached Figure 2 is Schematic diagram of the functional modules of the sending end of the DMT system. After buffering and serial-to-parallel conversion of the input bit stream at the sending end, the channel characteristic parameter information returned by the low-speed reverse channel is used to complete the subcarrier bit allocation, and then after encoding mapping, convolution and IFFT transformation, a cyclic prefix (CP) is added , the bit stream after the parallel-to-serial conversion is sent to the line after digital-to-analog conversion. The receiving end recovers the data bit rate with the reverse process of the sending end. Channel characteristic parameters can be obtained th...

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Abstract

A resource distribution technique of discrete multiaudio modulation system includes carrying out maximum bit-loading for system and ending bit-loading course if maximum bit rate is not over object bit rate or otherwise deriving out loading parameter value, utilizing greedy bit erasure method to finalize bit distribution if parameter value is zero, applying parallel bit erasure method to speed up bit distribution rate and updating system bit rate and loading parameter if loading parameter value is not zero, using addition method to converge it to be object bit rate if system current bit rate is lower than object bit rate then using bit fine regulation to realize minimum power bit distribution.

Description

technical field [0001] A comprehensive bit loading method for optimal power allocation of a DMT (discrete multi-tone modulation system) belongs to the resource allocation technology of a discrete multi-tone modulation communication system. Background technique [0002] With the development of the Internet and the increasing demand of users for multimedia broadband digital services, it is required that the next generation broadband communication system not only can reliably perform high-speed data transmission, but also can flexibly allocate system resources to meet the different needs of different types of services. [0003] Discrete Multitone Modulation (DMT) is a special form of multicarrier modulation technique. DMT divides the communication channel into a sufficient number of narrowband sub-channels, each sub-carrier is independently QAM modulated, and IDFT and DFT are used to modulate and demodulate the signal. It is especially suitable for high-speed data transmission...

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Application Information

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IPC IPC(8): H04L27/00H04L27/26
Inventor 朱丽平姚彦周世东朱义胜
Owner TSINGHUA UNIV