Power Domain Multi-User Multiplexing Interference Cancellation
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, effectively multiplexing data from multiple users using power domain is challenging due to interference issues, where signals from users with lower transmission power are often processed as noise, leading to reduced spectrum efficiency and decoding performance.
Innovation Solution
A method and device for multi-user multiplexing transmission that involves acquiring control information for decoding interfering UEs, restoring their signals, and deleting them from received data to isolate data from target UEs, using techniques such as jointly coding modulation and coding schemes, power ratios, and dynamic resource element mapping to distinguish users based on different power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data from multiple users are multiplexed in the same time, frequency and spatial resources using power domain, then spectrum efficiency is improved, but decoding performance deteriorates due to interference from users with different power levels
Solution Approach 1:
The patent segments the received signal into multiple user signals by estimating and subtracting interference from users with different power levels. The base station separates the superimposed signals of multiple users in the power domain into individual user signals through iterative interference cancellation, allowing each user's data to be decoded independently.
Solution Approach 2:
The patent converts the harmful interference caused by power domain multiplexing into a beneficial structure by using the known power differences between users. The interference from higher-power users becomes predictable and removable through estimation and subtraction, transforming what was previously noise into structured information that can be eliminated.
2Reliability
If control information for interfering UEs is acquired and processed to restore and delete their signals, then decoding performance of target UEs is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-acquiring control information about interfering users before decoding the target user's data. The base station estimates interference signals and subtracts them in advance, creating a cleaner received signal that simplifies subsequent decoding operations. This preliminary interference removal reduces the complexity of the main decoding task.
Data Source
AI summary
The present application discloses a method for multi-user multiplexing transmission, for decoding data of a plurality of user equipments (UEs) multiplexed by power domain, comprising: acquiring control information for decoding an interfering UE; decoding received data according to said control information to obtain data of the interfering UE, coding said data to restore a signal of the interfering UE, and deleting the signal of the interfering UE from the received data; and decoding the received data from which the signal of the interfering UE has been deleted, to obtain data of a target UE. The present application further discloses a device for multi-user multiplexing transmission. With the present application, the multi-user multiplexing based on power domain can be effectively supported.