Multiuser Superposition Transmitter with Differential Code Rates
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Solution Overview
Problem
Current multiuser superposition transmission systems in LTE standards face suboptimal performance due to uniform code rates across all levels in a transmission symbol, leading to inefficient resource allocation and reduced overall system performance.
Innovation Solution
The proposed method involves determining unique encoding rates for each binary level of a transmission symbol and attaching redundancy bits based on these rates, allowing for differential code rate allocation and improved resource utilization through the use of Symbol-Level Redundancy Bits-Attached (S-RBA) and Codeword-Level Redundancy Bits-Attached (C-RBA) MUST transmitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform code rates are used across all levels in a transmission symbol, then the system implementation is simple, but the throughput and resource allocation efficiency deteriorate
Solution Approach 1:
The transmission symbol is segmented into multiple binary levels, and each level is assigned a different code rate. This segmentation allows the system to optimize the code rate for each specific level based on its requirements, thereby improving overall throughput while maintaining manageable complexity through structured division of the transmission process.
Solution Approach 2:
Different code rates are applied to different binary levels within the transmission symbol based on their specific quality requirements. This local quality approach ensures that each level receives the appropriate level of redundancy and protection tailored to its characteristics, optimizing resource allocation efficiency and system performance.
2Productivity
If non-orthogonal transmission technology is used to improve user throughput, then cell coverage and throughput for cell edge users are improved, but interference cancellation capability and receiver complexity must be enhanced
Solution Approach 1:
The system performs preliminary power allocation and code rate assignment at the transmitter before transmission. By pre-configuring the transmission parameters and allocating resources optimally at the source, the receiver complexity is reduced as it receives signals that are already optimized for the given channel conditions, eliminating the need for complex real-time interference cancellation.
Solution Approach 2:
The invention changes the transmission parameters by assigning different code rates to different binary levels and optimizing power allocation across users. This parameter optimization improves throughput by ensuring each level is transmitted with appropriate redundancy and power, reducing the burden on receivers to handle uniformly complex decoding scenarios.
3Productivity
If joint constellation mapping is used for multiple users, then resource utilization is improved, but the complexity of wireless demodulator and decoder increases
Solution Approach 1:
The joint constellation is segmented into multiple binary levels, each with its own code rate. This segmentation allows the demodulator and decoder to process each level independently with tailored decoding strategies, improving resource utilization while managing complexity through hierarchical processing rather than monolithic joint decoding.
Solution Approach 2:
The system dynamically assigns different code rates to different binary levels based on channel conditions and user requirements. This dynamic approach optimizes resource utilization by adapting to varying conditions, while the structured dynamic nature of the assignment maintains manageable complexity through predictable patterns and rules rather than arbitrary complexity.
Data Source
AI summary
The disclosure is directed to a method of multiuser superposition transmission (MUST) method and a transmitter using the same method. In one of the exemplary embodiments, the disclosure is directed to a method of multiuser superposition transmission (MUST) method used by a base station. The method would include not limited to: determining a first bit stream to be transmitted; encoding the first bit stream to generate an encoded first bit stream which has a plurality of binary levels per symbol; determining a first encoding rate for each of the binary levels of the encoded first bit stream, wherein at least two of the levels of the encoded first bit stream have a different code rate; and attaching a first plurality of redundancy bits based on the first encoding rate.