User-Specific Reference Signal Power Control via Modulus Elimination
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Solution Overview
Problem
In wireless communication systems using nonlinear precoding, the modulus operation on user-specific reference signals can lead to power increase and offset issues, degrading channel estimation accuracy and communication system performance due to limited transmitting power and interference elimination processing.
Innovation Solution
The method eliminates the need for modulus operation on user-specific reference signals by determining whether to perform power control through a preset power factor, avoiding modulus offset and enhancing channel estimation accuracy without increasing control signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If modulus operation is performed on user-specific reference signal to control power, then transmitting power is controlled, but modulus offset is introduced causing large error in channel estimation
Solution Approach 1:
The patent extracts the power control function from the modulus operation by introducing a separate power control mechanism. The modulus operation is removed entirely, and power control is achieved through other means (such as power scaling factors or amplitude modulation) that do not introduce offset errors. This separation allows power control to be maintained while eliminating the source of channel estimation errors.
Solution Approach 2:
The patent introduces an intermediary mechanism between the power control requirement and the reference signal transmission. Instead of directly applying modulus operation to the reference signal, an intermediary power control module is inserted that adjusts the signal power through methods that preserve the original signal's statistical properties, thereby avoiding offset introduction while still achieving power control.
2Object-affected harmful factors
If interference elimination processing is performed on user-specific reference signal, then mutual interference is reduced, but power of reference signal increases requiring modulus operation
Solution Approach 1:
The patent changes the parameter used for power control from modulus operation to alternative methods such as power scaling, amplitude modulation, or gain control. These parameter changes allow the reference signal power to be controlled without the harmful effects of modulus operation, while still benefiting from the interference elimination processing that reduces mutual interference among users.
3Power
If modulus operation is performed on reference signal, then power is controlled, but control signaling overhead increases
Solution Approach 1:
The patent implements self-service power control where the reference signal mechanism itself handles power control without requiring additional external control signaling. The power control is integrated into the signal processing chain through methods that automatically adjust power levels based on system conditions, eliminating the need for separate control signals and reducing overhead.
Data Source
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AI summary
Disclosed are a method and device for sending a user-specific reference signal, which relate to the field of communications and are used for solving the problem of poor performance of a communication system due to the fact that the user-specific reference signal is sent in the communication system using nonlinear precoding. The method includes: determining a modulus identification, and performing interference elimination processing on a user-specific reference signal according to the modulus identification to obtain the user-specific reference signal after the interference elimination processing; performing beamforming processing on the user-specific reference signal after the interference elimination processing to obtain a beamforming reference signal; and performing inverse fast fourier transform (IFFT) and digital-analogue conversion on the beamforming reference signal to obtain an analogue signal of the user-specific reference signal, and sending the analogue reference signal to a user terminal.