Non-Orthogonal Code Multiple Access Uplink Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in accommodating explosive data traffic, increasing transfer rates, supporting a large number of connected devices, achieving low end-to-end latency, and ensuring high energy efficiency, particularly in managing multi-user interference in non-orthogonal coded multiple access schemes.
Innovation Solution
The proposed method employs a non-orthogonal coded multiple access (NoMA) scheme that allocates multi-layers to user equipment (UE) using a precoding matrix, with a processor and transceiver system that transmits and receives signals through superposition in the same time-frequency resource, minimizing multi-user interference by using UE-specific non-orthogonal codebooks and optimizing codebook indices based on channel state and modulation order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-orthogonal coded multiple access scheme is used to increase user capacity and spectral efficiency, then the number of connected devices and data traffic capacity increase, but multi-user interference increases
Solution Approach 1:
The patent applies local quality by assigning UE-specific non-orthogonal codebooks to different user equipments. Each UE receives a customized codebook tailored to its channel conditions and service requirements, rather than using a uniform codebook for all users. This localized optimization allows the system to achieve high spectral efficiency while controlling interference through differentiated codebook designs for different UEs.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting codebook indices based on channel state information and modulation orders. The base station selects appropriate codebooks from codebook sets by changing parameters such as codebook index, spreading factor, and code rate according to real-time channel conditions. This adaptive parameter adjustment enables the system to maintain high spectral efficiency while managing multi-user interference through optimized codebook selection.
2Speed
If multi-layer transmission is implemented to increase data rate, then transfer rate per user increases, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the transmission into multiple layers, where each layer carries a portion of the data stream. The base station performs layer separation at the receiver by utilizing the UE-specific codebooks to distinguish and separate signals from different layers. This segmentation approach enables high transfer rates through multi-layer transmission while managing complexity through structured codebook-based signal separation.
Solution Approach 2:
The patent introduces codebook-based spreading sequences as an intermediary mechanism that facilitates multi-layer transmission. Each layer is spread with a unique codebook sequence, acting as an intermediary that allows the receiver to separate and identify different layers through correlation processing. This intermediary approach enables high-speed multi-layer transmission while keeping the system manageable through standardized codebook operations.
3Object-affected harmful factors
If non-orthogonal codebooks are used to minimize multi-user interference, then interference levels are controlled, but codebook management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple codebook sets with different properties before actual transmission. The base station prepares codebook sets with various spreading factors, code rates, and orthogonality characteristics in advance. When a UE needs to transmit or receive data, the base station selects an appropriate pre-prepared codebook from the sets based on channel conditions and service requirements. This preliminary preparation reduces real-time computation complexity while maintaining effective interference control through carefully designed codebook properties.
Data Source
AI summary
Provided is a method and device for transmitting uplink data by using a non-orthogonal code multiple access scheme in a wireless communication system. Specifically, a terminal supporting multiple layers receives an NoMA MCS index from a base station. The NoMA MCS index is selected from an NoMA MCS table on the basis of the quality of an uplink channel. The NoMA MCS table is defined in advance as a table including the NoMA MCS index, the number of multiple layers, and a modulation order. The number of multiple layers is determined according to the NoMA MCS index. The terminal transmits the uplink data configured on the basis of the NoMA MCS index, via the multiple layers.