Transmission Compensation Calibration for Accurate Channel Estimation
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Solution Overview
Problem
Existing radio communication systems face challenges in accurately estimating the response of a radio channel due to the inclusion of transmitter and receiver circuitry responses, which affects the precision of pre-compensation techniques like pre-coding, leading to suboptimal reception quality.
Innovation Solution
An apparatus is designed to calibrate transmission compensation by coupling transmitter and receiver circuitry within the apparatus, using signals transmitted and received by both to determine and apply differential compensation, accounting for the unique responses of transmitter and receiver circuitry to improve channel estimation and pre-compensation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard channel estimation is used including transmitter and receiver circuitry responses, then the estimation process is simple, but the precision of channel estimation deteriorates due to contamination from circuitry responses
Solution Approach 1:
The patent segments the channel estimation process into two distinct parts: (1) standard channel estimation that includes circuitry responses, and (2) separate calibration estimation that specifically measures transmitter circuitry response. By dividing the estimation task, the patent isolates the contaminating circuitry effects into a measurable calibration component that can be subtracted from the standard estimation, thereby improving overall channel estimation precision without requiring complete system redesign
Solution Approach 2:
The patent introduces calibration signals as an intermediary mechanism. These special calibration signals are transmitted through the transmitter circuitry to the receiver, allowing the system to measure and characterize the circuitry response separately. This intermediary calibration process acts as a mediator that enables the separation and removal of circuitry effects from the main channel estimation, improving measurement precision while managing system complexity through a structured two-phase approach
2Reliability
If pre-compensation is applied using standard channel estimation, then transmission processing is efficient, but reception quality deteriorates due to inaccurate channel response estimation
Solution Approach 1:
The patent applies preliminary action by performing calibration estimation before the main channel estimation and pre-compensation process. The system first measures the transmitter circuitry response using calibration signals, stores this calibration data, and then uses it to correct the standard channel estimation. This preliminary calibration step ensures that subsequent pre-compensation operations are based on accurate channel responses free from circuitry contamination, improving reception quality while maintaining processing efficiency through reusable calibration data
Solution Approach 2:
The patent implements a feedback mechanism where the calibration estimation results are fed back into the channel estimation process. The measured transmitter circuitry response from calibration signals is used to adjust and correct the standard channel estimation, creating a closed-loop system. This feedback approach ensures that pre-compensation is based on accurate channel characteristics, thereby improving reception quality without requiring complete re-estimation, thus maintaining transmission processing efficiency
3Measurement precision
If differential transmission compensation is applied to multiple transmitter circuitry, then signal independence from apparatus characteristics is improved, but calibration and processing complexity increases
Solution Approach 1:
The patent applies universality by designing a calibration framework that works across multiple transmitter circuitry units with a common receiver. The same calibration procedure and signal processing algorithms are universally applied to each transmitter-receiver pair, allowing the system to handle multiple transmitters through a standardized approach. This multi-functional calibration system improves signal independence from apparatus characteristics while managing complexity through reuse of the same calibration methodology across different transmitter units
Solution Approach 2:
The patent utilizes parameter changes by measuring and compensating for specific transmitter circuitry parameters (such as phase and amplitude responses) that differ between transmitters. By identifying and correcting these varying parameters through separate calibration for each transmitter circuitry, the system achieves differential transmission compensation. This approach improves signal independence from apparatus characteristics by addressing specific parameter variations while managing overall complexity through focused parameter-based correction rather than complete system redesign
Data Source
AI summary
An apparatus 10 is provided comprising: first and second transmitter circuitry 20_1, 20_2; first receiver circuitry 30_1; means for applying different transmission compensation to signals transmitted by the first/second transmitter circuitry 20_1, 20_2; means for calibrating the different transmission compensation comprising: using a signal transmitted by the first transmitter circuitry 20_1 that is coupled, within the apparatus 10, to and received by the first receiver circuitry 30_1 and a signal transmitted by the second transmitter circuitry 20_2 that is coupled, within the apparatus 10, to and received by the first receiver circuitry 30_1 to determine the different transmission compensation for application to a signal transmitted by the first transmitter circuitry 20_1 and to a signal transmitted by the second transmitter circuitry 20_2.