Non-Orthogonal Data Transmission via Code-Domain Superposition
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Solution Overview
Problem
Current communication systems, such as 4G and NTT DoCoMo's non-orthogonal multi-address access, face limitations in system capacity and data transmission capability due to restricted energy distribution and resource utilization, leading to inefficient data transmission.
Innovation Solution
A data transmission method that maps multiple pieces of data to fewer physical resources, allowing each piece to be superposed and transmitted on identical resources, with varying numbers of resources per data piece to maximize pattern and minimize interference, thereby improving system capacity and reducing resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal physical resources are allocated to each piece of data, then interference among data is eliminated, but system capacity and data transmission capability are limited
Solution Approach 1:
Multiple pieces of data are merged and transmitted on the same physical resource through superposition. The base station superposes multiple data streams in the code domain, allowing them to share the same time-frequency resource, thereby increasing system capacity while maintaining transmission reliability through advanced detection techniques at the receiver.
Solution Approach 2:
The patent transitions from orthogonal resource allocation (time-frequency domain) to code-domain multiplexing. By introducing a code dimension for superposition, multiple data streams can coexist on the same physical resource, effectively adding another dimension to resource utilization and breaking the limitation of orthogonal systems.
2Productivity
If non-orthogonal multi-address access with energy distribution is used, then system capacity improves compared to orthogonal systems, but degree of freedom for energy distribution is restricted and system capacity remains insufficient
Solution Approach 1:
The patent changes the fundamental parameter from energy distribution to code-domain superposition. Instead of allocating energy proportions to different users, the system uses code sequences to enable multiple data streams to occupy the same physical resource, providing greater flexibility and degree of freedom in resource allocation while achieving higher system capacity.
3Productivity
If multiple pieces of data are transmitted on the same physical resource, then resource utilization efficiency improves, but interference management complexity increases
Solution Approach 1:
The patent segments data in the code domain by assigning different code sequences to different data streams. This segmentation allows the receiver to separate and detect individual data streams from the superposed signal, managing interference through code orthogonality or near-orthogonality rather than requiring complex interference cancellation algorithms.
Solution Approach 2:
Code sequences serve as an intermediary that enables multiple data streams to share the same physical resource. The code domain acts as a mediator that structures the superposed signal, allowing the receiver to identify and separate individual data streams through correlation detection, thereby simplifying interference management compared to direct signal separation.
Data Source
Figure 1~3a
Figure 3b
Figure 3c~5
AI summary
The present disclosure relates to the field of communication technology, and provides a data transmission method, a data reception and detection method, a base station and a UE on the basis of a non-orthogonal mode. Before the transmission of pieces of data on physical resources by the base station, a plurality of pieces of data is firstly mapped to the physical resources at an amount not greater than the number of the pieces of data, each piece of data in the plurality of pieces of data is mapped to at least one physical resource, and the number of the physical resources to which each piece of data is mapped is not completely the same. Then, the pieces of data on the physical resources are transmitted by the base station. According to the present disclosure, it is able to transmit more pieces of data through fewer physical resources, thereby to improve the data transmission capability for the communication system.