Constellation Expansion Modulation for Multi-User Interference
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Solution Overview
Problem
In the constellation expansion multiple access manner, the existing technologies face issues such as mismatched antenna gain and significant interference between data streams, leading to unreliable signal transmission in multi-user environments.
Innovation Solution
A data transmission method and device that utilize channel quality feedback from user terminals to determine the appropriate constellation expansion modulation scheme, intra-stream power allocation factor, and initial phase rotation coefficient for each user terminal, ensuring proper antenna configuration and minimizing interference by grouping user terminals served by the same transmit antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constellation expansion multiple access is used for multi-user transmission, then the system capacity and spectral efficiency are improved, but antenna gain mismatch and inter-stream interference occur
Solution Approach 1:
The patent applies local quality by configuring different constellation expansion parameters (modulation orders, power allocation factors, phase rotation coefficients) for different user terminals based on their specific channel conditions. Each user terminal receives customized transmission parameters tailored to its channel quality, thereby resolving the antenna gain mismatch and inter-stream interference problems while maintaining high system capacity
Solution Approach 2:
The patent dynamically adjusts transmission parameters including modulation order, power allocation factor, and phase rotation coefficient based on channel quality feedback from user terminals. By changing these parameters adaptively, the system achieves both high productivity through efficient multi-user transmission and high reliability through optimized signal quality for each user
2Productivity
If multiple user terminals are served by the same transmit antenna, then resource utilization is improved, but intra-stream interference increases
Solution Approach 1:
The patent changes transmission parameters dynamically based on channel conditions. When multiple user terminals are served by the same transmit antenna, the system adjusts power allocation factors and modulation orders for each user to minimize intra-stream interference while maximizing resource utilization
Solution Approach 2:
The patent implements a feedback mechanism where user terminals report channel quality information to the base station. The base station uses this feedback to determine appropriate user terminal groups for each transmit antenna and configures transmission parameters that balance resource utilization with interference mitigation
Data Source
AI summary
The present invention discloses a solution including: receiving channel quality fed back by at least two user terminals; determining, according to the received channel quality fed back by the at least two user terminals, a user terminal that needs to be served by each transmit antenna of a base station device; for user terminals served by a same transmit antenna, configuring, according to channel quality fed back by the user terminals served by the same transmit antenna, a constellation expansion modulation scheme for each user terminal served by the same transmit antenna, and determining an intra-stream power allocation factor and an initial phase rotation coefficient of the transmit antenna; and processing, by using the modulation scheme, a signal to be sent to the user terminal, and transmitting the processed signal to the user terminal according to the intra-stream power allocation factor and the initial phase rotation coefficient.