Transceiver Pre-coding with Hardware Disturbance Estimation
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Solution Overview
Problem
Advanced antenna systems face challenges in properly selecting beam-forming at transmitter nodes and filtering at receiver nodes, as well as controlling transmission power, especially when hardware impairments like non-linear distortions and noise are present, which existing iterative approaches do not adequately address.
Innovation Solution
A method and apparatus for transceiver pre-coding settings that involve estimating and accounting for signal distortions in both forward and reverse channels by using signal-to-interference-plus-noise-plus-distortion ratio (SINDR) instead of signal-to-interference-plus-noise ratio (SINR), updating pre-coding settings based on estimated disturbance components, and iteratively optimizing transmission power to minimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If iterative approaches for transceiver pre-coding setting and power control are applied, then transmission power for each user can be minimized to achieve reliable transmission, but communication performance deteriorates when hardware impairments like non-linear distortions and noise are present
Solution Approach 1:
The patent applies preliminary action by estimating hardware-induced disturbance components (non-linear distortions and noise) before performing pre-coding optimization. The transmitter and receiver nodes预先 estimate these distortion components and incorporate them into the pre-coding design, allowing the system to compensate for hardware impairments in advance rather than dealing with their effects afterward. This enables reliable communication performance even when minimizing transmission power.
2Adaptability or versatility
If existing iterative approaches are used for pre-coding setting, then transmission power can be controlled, but the approaches fail to adequately address hardware-induced distortions
Solution Approach 1:
The patent introduces an intermediary approach by using estimated disturbance components as a mediator between the transmitted signals and the received signals. Instead of directly modeling complex non-linear hardware distortions, the system estimates equivalent disturbance components that capture the net effect of hardware impairments. These disturbance estimates serve as intermediaries that simplify the pre-coding optimization while still accounting for hardware effects, improving adaptability without sacrificing measurement precision.
3Productivity
If beam-forming and filtering are optimized for spatial multiplexing, then overall throughput is improved, but the system becomes sensitive to hardware impairments
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful effect of hardware impairments into beneficial information. Instead of treating non-linear distortions and noise merely as degradation factors, the system estimates these distortion components and uses them to adapt the pre-coding settings. By doing so, the hardware impairments that initially reduce throughput become the basis for optimizing beam-forming and filtering, ultimately improving overall throughput while maintaining robustness against hardware effects.
Data Source
AI summary
Pre-coding methods are disclosed for a transmitter node and for a receiver node, respectively. The transmitter node and/or the receiver node comprises at least one hardware component causing signal distortion for a forward channel and/or a reverse channel Transmitter node reference signals are transmitted by the transmitter node and received by the receiver node, wherein the transmitter node reference signals result from use of a transmitter node transmission pre-coding setting and an allocated transmission power. The receiver node estimates a forward channel disturbance component (including the signal distortion for the forward channel), selects a receiver node reception pre-coding setting based on the estimated forward channel disturbance component, and updates a receiver node transmission pre-coding setting by using the selected receiver node reception pre-coding setting as receiver node transmission pre-coding setting. Receiver node reference signals are transmitted by the receiver node and received by the transmitter node, wherein the receiver node reference signals result from use of the updated receiver node transmission pre-coding setting. The transmitter node estimates a reverse channel disturbance component (including the signal distortion for the reverse channel), selects a transmitter node reception pre-coding setting based on the estimated reverse channel disturbance component, and updates the transmitter node transmission pre-coding setting by using the selected transmitter node reception pre-coding setting as transmitter node transmission pre-coding setting. Corresponding pre-coding apparatuses, transmitter/receiver nodes, and computer program product are also disclosed.