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A multiple access method and device, and terminal

An access method and one-way technology, applied in the direction of digital transmission system, forward error control, error prevention, etc., can solve the problems of high complexity, incompatibility, low reliability, etc., to reduce the signal processing delay, simplify the Design, randomize the effects of interference

Active Publication Date: 2022-04-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 2-element sequence limits the number of low cross-correlation sequences, so it is difficult to support a large number of user access
When signals are combined, their post-combination reliability is not high, which reduces system performance in some cases
[0010] SCMA has better performance, but generally needs to use MPA receiver, which is more complex
Using EPA receivers can reduce the complexity, but it is generally not compatible with MMSE-SIC receivers and ESE receivers, resulting in low flexibility
In addition, its spread spectrum length cannot be adjusted flexibly, and it is not very good for multi-user support under low spectral efficiency

Method used

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  • A multiple access method and device, and terminal
  • A multiple access method and device, and terminal
  • A multiple access method and device, and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The bit randomization of each signal is realized by bit cyclic shift. The bit cyclic shift value of the multi-channel signal satisfies a certain relationship to ensure that some bits mapped to high-reliability positions are mapped to low-reliability positions on another channel of data when high-order modulation is used. In this way, system performance can be improved when multi-channel signals are combined.

[0093] Taking 16QAM as an example, when using the bit-to-symbol mapping defined by 5G NR, 4 bits are mapped to one symbol. Among the 4 bits, the first two are high reliability bits, and the last two are low reliability bits. When K=2, the number of cyclic shifts of the two signals can be shown in the following table (A and B are integers):

[0094]

[0095] Table 1 Number of cyclic shifts of the two signals

[0096] The relative bit displacement value of the two signals satisfies 4X+2 (X is an integer).

[0097] Taking 64QAM as an example, when using the bi...

Embodiment 2

[0106] The bit randomization of each channel signal is first performed block interleaving, and then the position interleaving of every X bits in the block (X bits are mapped to a symbol);

[0107] The positional interleaving principle of X bits of multiple signals (X bits are mapped to a symbol) is to minimize the block error rate;

[0108] In a method with the smallest block error rate after merging, this bit is located in a high-reliability position on some signals, and it is in a low-reliability position on other signals;

[0109] Bit positions in bit-high reliable positions are interchangeable, and bit positions in bit-low reliable positions are interchangeable;

[0110] Block interleave the coded bits. Assume here X bits are mapped to a symbol. The relationship between the modulation mode and X is shown in Table 4:

[0111] modulation X BPSK 1 QPSK 2 16QAM 4 64QAM 6 256QAM 8

[0112] Table 4 The relationship between modulat...

Embodiment 3

[0121] The user cyclic shift value can be uniquely bound to the UE ID. The cyclic shift of the first channel of data of each user has a corresponding relationship with the UE ID, and the i-th channel of data has a fixed relationship with the cyclic shift of the first channel of data. In this way, when the UE ID is known, the cyclic shift value of each signal of all users can be uniquely obtained, which is convenient for the receiver to perform cyclic detection.

[0122] In this way, different users can be distinguished through a disguised interleaver such as a shift sequence.

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Abstract

The present invention provides a multiple access method and device, as well as a terminal. The method includes: an input signal undergoes a multi-channel signal processing process to obtain a corresponding multi-channel signal; wherein, the multi-channel signal processing process includes: The signal adopts a bit randomization process; multiple signal resources are mapped into one output signal; and the output signal is sent. Through the scheme of the present invention, for bit randomization of multi-channel signals, when high-order modulation is used, due to the adjustment of bit positions, when these bits are mapped to modulation symbols, they are in the high reliability positions of some signals, and in the low reliability positions of other signals. When combining signals, the modulation gain can be obtained; in addition, in order to simplify the design of the interleaver, the interleaver function can be realized by using the bit cyclic shift, which not only randomizes the interference, but also reduces the signal processing delay .

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multiple access method and device, and a terminal. Background technique [0002] Multiple access technology is one of the key technologies of wireless communication. In the 5G era, the Internet of Things will develop greatly, and there will be 10 billion things connected in the future. In order to support such a large number of object links, a new multi-access scheme is required. After research, the industry has reached a consensus that non-orthogonal multiple access will be used to increase the number of users that can be accessed at the same time. [0003] At present, the non-orthogonal multiple access technologies proposed by domestic companies mainly include the MUSA (Multi-user shared access, MUSA) multi-user shared multiple access method, the sparse code-based multiple access (Sparse code multiple access, SCMA) access method, A pattern division multiple access (PD...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04B1/707
CPCH04L1/0071H04L1/0043H04L1/0052H04L1/0041H04L1/0045H04L1/0061H04B1/707H04L1/00
Inventor 严春林袁志锋
Owner ZTE CORP
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