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Superimposed coding and demodulation method and device for multi-user information transmission

A technology of superposition coding and information transmission, which is applied in the field of superposition coding of demodulation and multi-user information transmission, and can solve the problems of lack of Gray mapping properties and so on.

Active Publication Date: 2016-06-01
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To sum up, in the related art, multiple user signals are directly added and the final combined constellation points lack the Gray mapping property.

Method used

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  • Superimposed coding and demodulation method and device for multi-user information transmission
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  • Superimposed coding and demodulation method and device for multi-user information transmission

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Embodiment 1

[0110] Image 6 It is a schematic diagram of a wireless broadcast communication system implemented by using a superposition coding method of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Such as Image 6 As shown, the base station can transmit multi-user information to two user equipments (ie, UE1 and UE2).

[0111]In the base station, the dual information streams can be modulated into complex symbol sequences S1 and S2 with a certain power, and the complex symbol sequence S3 is obtained after image superposition processing.

[0112] First, the dual information streams are obtained by turbo encoding the dual information bit streams to be sent to the user respectively, wherein the protection priority of C1 is greater than that of C2. C1 and C2 are modulated into complex symbol sequences S1 and S2 with a certain power, wherein the modulation order of S1 is lower than or equal to the modulation order of S2. ...

Embodiment 2

[0118] Figure 7 It is a schematic diagram of a typical receiver structure of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Such as Figure 7 As shown, the receiver may include but not limited to: a receiving module, a demodulation module and a decoding module.

[0119] The dual information flow is transmitted on the "whole channel", the edge user receiver 1 demodulates the required information with other interference information, and the center user receiver 2 demodulates the interference information after demodulating the interference information and removes the interference information, mirror demodulation output the required information.

[0120] In receiver 1, the edge user first receives the complex symbol sequence R1, and then demodulates the strong signal (information sent to the edge user) S1' with the interference of the weak signal (information sent to the center user), and finally decodes the e...

Embodiment 3

[0123] Figure 8 A schematic structural diagram of a superposition coding device of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Figure 9 It is a structural schematic diagram of the transmitter module of the superposition coding device of the downlink multi-user information transmission system according to the preferred embodiment of the present invention. Such as Figure 8 with Figure 9 As shown, the superposition coding apparatus may include but not limited to: a transmitter BS, a channel, and a receiver. The transmitted signal reaches receiver 1 via channel 1 and receiver 2 via channel 2. The BS stores wireless channel related information with each receiver, and there is a large difference in the quality of the wireless channel from the BS to receiver 1 and from the BS to receiver 2, for example, a difference of 20 dB. The transmitter can be a base station, a relay node or a network coding node. T...

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Abstract

The invention discloses a superimposed coding and demodulation method and a device for multi-user information transmission. In the method, a dual information stream is respectively modulated into a first complex symbol sequence and a second complex symbol sequence. The first complex symbol sequence and the second complex symbol sequence are superposed to be subjected to the encoding treatment so as to generate a third complex symbol sequence. The third complex symbol sequence has the Gray mapping property. Emission signals is formed based on the third complex symbol sequence, and then the mission signals are sent to a plurality of receivers. According to the technical scheme of the invention, not only the symbol-level SIC demodulation is realized at receiving terminals, but also SIC receivers are greatly simplified. Moreover, superposed and coded signals have the Gray property. In addition, different powers are flexibly distributed to different data streams, and the multi-address access performance is improved.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a superposition coding and demodulation method and device for multi-user information transmission. Background technique [0002] The multi-user information transmission technology or multiple access multiplexing technology can be divided into Orthogonal Multiple Access (OMA for short) and Non-Orthogonal Multiple Access (None Orthogonal Multiple Access, NOMA for short). Traditional TDMA, orthogonal CDMA, and OFDMA all belong to the category of orthogonal multiple access multiplexing technology. In the orthogonal multiple access multiplexing technology, each user uses strictly orthogonal "sub-channels" to communicate, so there is no mutual interference between user information during demodulation, and it is easier to separate user information. In contrast, in non-orthogonal multiple access multiplexing technology, the information of each user is transmitted on the "whole channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/00H04L5/0037H04L27/3488H04L27/38H04L27/04H04L27/2604
Inventor 袁志锋戴建强
Owner ZTE CORP