Self-adaptive transmission method and system based on bit division multiplexing

A bit division multiplexing and adaptive transmission technology, applied in the field of digital information transmission, can solve the problems of low flexibility of channel resource allocation, constellation diagram change, low average transmission rate, etc., to optimize the average transmission rate, improve flexibility, Avoid the effects of constellation changes

Active Publication Date: 2014-07-02
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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Problems solved by technology

[0006] In addition, it is also necessary to provide an adaptive transmission system based on BDM to make up for the problems of low average transmission rate, low flexibility of channel resource allocation and constellation diagram changes in traditional adaptive coding and modulation technology

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  • Self-adaptive transmission method and system based on bit division multiplexing
  • Self-adaptive transmission method and system based on bit division multiplexing
  • Self-adaptive transmission method and system based on bit division multiplexing

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Embodiment Construction

[0028] Bit Division Multiplexing (BDM) is a bit-level channel division multiplexing method across one or more symbols. When using BDM to transmit information of multiple services, channel resources are divided into multiple bit-level physical layer sub-channels at the bit level, and each bit-level physical layer sub-channel is used to transmit a kind of service information. Using the BDM multi-service transmission method, the resource scheduling is very flexible, and any constellation mapping can be used, and the spectrum utilization rate is higher than that of the traditional physical layer sub-channel based on the symbol level.

[0029] see figure 1 , a BDM-based adaptive transmission system 100 according to a preferred embodiment of the present invention includes a sending end 10 and a receiving end 30 . The sending end 10 includes a transmission mode determination module 11 , an encoding module 13 , a constellation mapping module 15 and a processing module 17 . Combine b...

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Abstract

The invention relates to a self-adaptive transmission method based on bit division multiplexing. The method comprises the steps that (a), a transmission mode is selected according to a predicted value of the current channel state; (b), channel encoding and bit interleaving are independently conducted on input information bit in each bit pipeline, and an encoded bit is obtained; (c) constellation labeling is conducted on encoded bits output by the bit pipelines at the same time, and a sending symbol is obtained and output; (d) the sending symbol is received; (e) the current channel state information and a transmission mode are combined to conduct demodulation decoding on the received sending symbol, and demodulation decoding results of all the bit pipelines are obtained, wherein the steps (a), (b) and (c) are executed by a sending end, and the steps (d) and (e) are executed by a receiving end. The invention further relates to a self-adaptive transmission system based on bit division multiplexing. Compared with a traditional self-adaptive encoding modulation method, the average transmission rate of users is effectively improved, and the problems that channel resource allocation flexibility is low and a constellation diagram changes are solved.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to an adaptive transmission method and system based on Bit Division Multiplexing (BDM). Background technique [0002] In wireless digital communication systems, wireless channels often have time-varying fading characteristics during data transmission, that is, when the transmitted signal power is constant, the channel capacity changes with time. Even if the feedback channel feeds back the channel state at the previous moment, the channel state at the current moment deviates from the channel state at the previous moment with a certain probability distribution. [0003] In the adaptive coding and modulation system, the transmitting end determines the corresponding coding and modulation mode according to the predicted value of the channel state at the current moment. In the traditional adaptive coding and modulation method, two typical methods are: 1. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 宋健彭克武金黄平黄嘉晨
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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