NOMA Radio Base Station Power Dimension Multiplexing
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Solution Overview
Problem
The throughput and system capacity of radio communication systems using MIMO transmission are limited by the complexity of the system structure as the number of antennas increases, and existing methods like precoding and power control face challenges in accurately determining channel state and interference cancellation.
Innovation Solution
A radio communication system employing non-orthogonal multiplexing (NOMA) with opportunistic beamforming, where a radio base station generates multiple transmission beams with specific downlink reference signals, and user terminals feed back channel state information to determine optimal user terminal selection and power allocation for non-orthogonal multiplexing, allowing for improved throughput and system capacity without increasing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antennas is increased to transmit more information data sequences in parallel, then throughput and system capacity are improved, but system structure complexity increases
Solution Approach 1:
The patent transitions from spatial dimension multiplexing (MIMO with multiple antennas) to power dimension multiplexing (NOMA with multiple power levels). Instead of adding more antennas to increase parallel data sequences, the invention superimposes multiple user signals with different power levels on the same time-frequency resources, achieving multiple access through power domain separation rather than spatial separation.
Solution Approach 2:
The invention changes the multiplexing parameter from spatial (number of antennas) to power (transmission power levels). By adjusting power allocation parameters and using successive interference cancellation based on power differences, the system can support multiple users on the same resources without increasing antenna count, thus improving throughput while maintaining simpler system structure.
2Productivity
If the number of antennas is increased to transmit more information data sequences in parallel, then system capacity is improved, but ease of operation deteriorates
Solution Approach 1:
The patent moves from spatial dimension operations (complex MIMO processing with multiple antennas) to power dimension operations (simpler power allocation and successive interference cancellation). This dimensional shift reduces the operational complexity of managing multiple data sequences while maintaining high system capacity.
3Productivity
If conventional MIMO transmission is used to achieve high throughput, then throughput is improved, but device complexity increases
Solution Approach 1:
The patent applies non-orthogonal multiplexing in the power dimension instead of orthogonal multiplexing in the spatial dimension. Multiple users share the same time-frequency resources with different power levels, and the receiver uses successive interference cancellation to separate signals. This approach achieves high throughput without requiring complex MIMO processing at the device level.
Solution Approach 2:
The invention replaces the mechanical/spatial system of multiple antennas and complex MIMO processing with a power-based system using superposition coding and successive interference cancellation. This substitution simplifies the device structure while maintaining the capability to serve multiple users in parallel.
Data Source
AI summary
A user terminal includes a receiving section that receives a signal subjected to multiplexing in a power dimension in a given layer and that receives information about the multiplexing in the power dimension; and a signal processing section that demodulates a signal for the user terminal from the multiplexed signal based on the information about the multiplexing in the power dimension.