Local Oscillator Leakage Reporting for Sub-THz Throughput
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively managing local oscillator (LO) leakage, which affects signal quality and throughput, particularly in high-frequency bands like sub-THz communications, due to imperfect cancellation techniques leading to power amplifier input power issues, noise on adjacent LO subcarriers, and clipping.
Innovation Solution
Implementing LO leakage reporting mechanisms that allow network entities to estimate and transmit LO leakage indicators, enabling gradient descent correction and improving signal processing to account for LO leakage, thereby enhancing communication performance in bands like sub-THz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mixer-based signal generation is used in high-frequency bands, then spectral efficiency and throughput are improved, but local oscillator leakage causes harmful effects including power amplifier input power issues, noise on adjacent subcarriers, and clipping
Solution Approach 1:
The patent implements feedback mechanisms where the receiving device measures LO leakage in the received signal and sends feedback indicators to the transmitting device. The transmitting device uses this feedback to adjust its mixing parameters and apply correction techniques, creating a closed-loop system that continuously reduces LO leakage while maintaining high throughput in sub-THz communications
Solution Approach 2:
The patent introduces intermediary correction signals and reference signals that mediate between the LO leakage problem and the desired clean signal. These intermediary elements enable the system to characterize and compensate for LO leakage effects without directly eliminating the underlying mixing process that enables high-frequency communication
2Device complexity
If imperfect LO leakage cancellation techniques are applied, then signal generation complexity is reduced, but signal quality deteriorates due to power amplifier input power issues, noise, and clipping
Solution Approach 1:
The patent applies preliminary LO leakage correction by characterizing the leakage properties before main signal processing using reference signals. By pre-characterizing the LO leakage parameters (amplitude, phase, frequency offset) and applying preliminary compensation, the system reduces the burden on subsequent cancellation techniques while maintaining high signal quality
Solution Approach 2:
The patent replaces complex hardware-based LO leakage cancellation mechanisms with software/digital signal processing approaches. By using digital correction algorithms that operate on the baseband signal, the system achieves effective LO leakage cancellation without requiring complex hardware modifications, thus maintaining simplicity while improving signal quality
3Reliability
If LO leakage reporting mechanisms are implemented, then communication performance is improved through real-time correction, but device complexity and overhead increase
Solution Approach 1:
The patent implements multi-functional reference signals that serve dual purposes: characterizing LO leakage properties and enabling normal channel estimation. By making reference signals serve multiple functions simultaneously, the system reduces the need for separate dedicated LO leakage measurement signals, thereby reducing overhead and complexity while maintaining performance improvement
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network entity may transmit a signal generated using a mixer, wherein the signal is subject to local oscillator (LO) leakage in connection with the generation using the mixer. The network entity may transmit an LO leakage estimate indicator based at least in part on the LO leakage of the signal in connection with the generation using the mixer. Numerous other aspects are described.