Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method

A technology of superposition coding and orthogonal multiplexing, which is applied in the field of digital information transmission and can solve the problems of limited number of unequal error protection degrees and performance limit loss.

Inactive Publication Date: 2015-04-01
TSINGHUA UNIV
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Problems solved by technology

However, when BDM technology is used, the number of unequal error protection levels for multiple bits in the actual constellation mapping is limited. Therefore, when there are many users in the coverage area and the number exceeds the number of unequal error protection levels, there will be a loss of performance limit

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  • Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method
  • Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method
  • Superposition coding and orthogonal multiplexing combined downlink multiuser transmission method

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Embodiment Construction

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0035] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicat...

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Abstract

The invention discloses a superposition coding and orthogonal multiplexing combined downlink multiuser transmission method which comprises the following steps: S1, acquiring channel quality and requirement parameters of a plurality of users in a coverage range; S2, according to the channel quality and the requirement parameters of the plurality of users, carrying out grouping on the plurality of users to obtain a plurality of user groups, and determining a ratio of channel resources distributed to each user group; S3, according to the ratio of the channel resources distributed to each user group, carrying out symbolic level division on the physical layer channel resources on an orthogonal domain to obtain a plurality of symbolic level physical layer sub-channels; S4, according to the channel quality and the requirement parameters of users in each user group, in the symbolic level physical layer sub-channel corresponding to each user group, transmitting information of the users in each user group by adopting a superposition coding technology. Relative to the optimal SC (superposition coding) technology, the superposition coding and orthogonal multiplexing combined downlink multiuser transmission method has the advantage of greatly reducing implementation complexity of a terminal and time delay of the user information; relative to a conventional orthogonal multiplexing technology, the superposition coding and orthogonal multiplexing combined downlink multiuser transmission method has the advantage that the total system transmission rate is obviously promoted.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a downlink multi-user transmission method of joint superposition coding and orthogonal multiplexing. Background technique [0002] In a wireless digital communication system, the sending end needs to communicate with multiple users within the coverage area, therefore, it is necessary to solve the downlink multiple access problem of the broadcast channel. [0003] In general, there are differences in the channel quality of multiple users within the coverage area. In order to maximize the transmission rate of the system, it is optimal to use SC (Superposition Coding, superposition coding) technology for downlink multi-user transmission, but after using the SC technology, all users need to be considered comprehensively, so the implementation complexity is the highest. In addition, in order to achieve optimal transmission performance, the receiving terminal ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L5/00
Inventor 宋健金黄平彭克武陈霜
Owner TSINGHUA UNIV
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