Multi-user information co-channel sending method and device, and multi-user information co-channel receiving method and device

A technology of user information and sending method, which is applied in the field of communication and can solve problems such as access performance degradation

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

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Problems solved by technology

[0005] The present invention provides a multi-user co-channel to at least solve the problem of a large risk of error propagation when performing symbol-level SIC when the terminal demodulates in an actual fading channel during NOMA downlink transmission, resulting in a decrease in access performance. question

Method used

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  • Multi-user information co-channel sending method and device, and multi-user information co-channel receiving method and device
  • Multi-user information co-channel sending method and device, and multi-user information co-channel receiving method and device
  • Multi-user information co-channel sending method and device, and multi-user information co-channel receiving method and device

Examples

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Embodiment 1

[0149] In order to emphasize the characteristics of the present invention, the following preferred typical examples further illustrate the embodiments of the present invention.

[0150] There are 16 users in the cell, and the base station divides these 16 users into 8 groups, and each group has two users, one edge user and one central user. The channels between edge users and central users and the base station are differentiated.

[0151] The modulation symbols of all user information in each group are superimposed and coded to generate superimposed symbols. Different sequences in the 8×8 orthogonal sequence set are used to perform spread spectrum extension processing on each group of superimposed symbols to generate an extended symbol sequence, and 8 sets of extended symbol sequences are combined to obtain a combined symbol sequence. The base station forms a transmission signal from the combined symbol sequence and sends it to 16 user terminals. Such as Figure 11 Shown is...

Embodiment 2

[0160] Figure 17 A schematic diagram showing a typical receiver structure of the multi-user information co-channel broadcasting system according to the preferred embodiment 2 of the present invention. Such as Figure 17 As shown, the first group of user 1 receives the transmission signal from the transmitter, where the transmission signal is the base station using the spreading sequence C1 to perform spread spectrum processing on the symbols after the modulation symbols of the first group of user information are superimposed and coded, and generate the expanded The symbol sequence is the merged symbol sequence obtained by merging the symbol sequences after all group extensions.

[0161] User 1 performs channel equalization, and then uses spreading sequence C1 to despread to obtain the information corresponding to the superimposed symbols of the first group of users, and then demodulates the user information according to the corresponding method. If user 1 is a weaker user, ...

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Abstract

The invention discloses a multi-user information co-channel sending method and device, and a multi-user information co-channel receiving method and device. The multi-user information co-channel sending method comprises following steps: dividing N users into K groups; generating L superposition symbols according to the modulation symbols of each piece of user information in each group, wherein the K, N and L are integers, the L is more than or equal to K, the K is more than or equal to 1, the N is more than or equal to 2, and the L is not equal to 1; separately carrying out spread spectrum extension on the L superposition symbols by using different sequences in L orthogonal sequences with lengths of L, thus obtaining L symbol sequences; combining the L symbol sequences, thus obtaining combined symbol sequences; and sending transmitting signals formed by the combined symbol sequences. Through the methods and the devices of the invention, the problem that during NOMA downlink sending, in an actual fading channel, the risk of error propagation is great if symbol-level SIC is performed in the demodulation process of the terminal, which causes performance degradation, is solved; and the access performance is improved.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method and device for co-channel sending and receiving of multi-user information. Background technique [0002] Multi-user information transmission can be divided into Orthogonal Multiple Access (OMA) and Non-Orthogonal Multiple Access (Non-Orthogonal Multiple Access, NOMA) according to the access mode. In the OMA mode, each user uses strictly orthogonal "sub-channels" to transmit, so there is no mutual interference between user information during demodulation. In contrast, in the NOMA mode, the information of each user is transmitted on the "whole channel", so the information of each user interferes with each other during demodulation. There are two cases of multi-user information transmission, downlink transmission and uplink transmission. Downlink is also called broadcasting, which means that the transmitter sends information to multiple receivers at the same time. R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L27/26
Inventor 袁志锋戴建强胡留军
Owner ZTE CORP
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