Dedicated Pilot Signals for RF Impairment Compensation
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Solution Overview
Problem
Wireless communications systems face challenges in compensating for in-phase and quadrature (IQ) imbalances, which lead to signal distortion and reduced signal-to-noise ratio (SNR), especially in higher RF bands.
Innovation Solution
A method and apparatus for wireless communications where a user equipment (UE) measures and reports IQ imbalances to a network entity, enabling proactive compensation. This involves transmitting an indication of the UE's capability, monitoring a wireless channel for a pilot signal, and transmitting information corresponding to the imbalance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs local IQ imbalance compensation, then the signal quality is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent introduces a network entity as an intermediary that performs IQ imbalance compensation centrally. Instead of the UE independently measuring and compensating for IQ imbalances, the network entity receives measurements from the UE and applies compensation algorithms remotely, thereby reducing UE complexity while maintaining signal quality improvement
Solution Approach 2:
The patent replaces the mechanical/self-service approach of UE-based compensation with a network-controlled approach. The UE simply measures and reports imbalance conditions, while the network entity handles the complex compensation operations, substituting UE-side processing with network-side processing
2Measurement precision
If the UE measures and compensates for IQ imbalances independently, then the compensation accuracy is improved, but the power consumption increases
Solution Approach 1:
The network entity serves as an intermediary that performs power-intensive compensation calculations remotely. The UE only performs low-power measurement and reporting functions, while the network entity handles the computationally demanding compensation algorithms, thereby reducing UE power consumption while maintaining compensation accuracy through network-side processing
3Measurement precision
If dedicated pilot signals are transmitted for IQ imbalance measurement, then the measurement precision is improved, but the system overhead increases
Solution Approach 1:
The patent applies local quality by transmitting pilot signals only in specific time-frequency resources dedicated to IQ imbalance measurement, rather than continuously. The network entity configures these pilots to be transmitted only when needed and in specific patterns, reducing overall system overhead while maintaining measurement precision during the measurement intervals
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for dedicated pilot signals associated with radio frequency impairment compensation. In some aspects, a user equipment (UE) and a network entity may support a signaling mechanism according to which the UE may measure and report, to the network entity, an imbalance between an in-phase (I) component and a quadrature (Q) component of a modulated signal. For example, the UE may request the network entity to transmit an out-of-band pilot signal to enable frequency domain residual side band (FDRSB) estimation at the UE and the UE may transmit measurement information associated with the IQ imbalance or the FDRSB estimation to the network entity. The network entity may receive the measurement information and compensate or correct signaling in accordance with the received measurement information.