MIMO-OFDM Phase Noise Compensation Using Pilot Subcarriers
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Solution Overview
Problem
In MIMO-OFDM systems where receive or transmit antennas do not share a common oscillator, existing phase noise compensation methods result in low precision, leading to signal distortion.
Innovation Solution
A signal processing method that acquires and compensates the phase of each transmit and receive antenna, using pilot subcarriers to calculate and apply phase correction formulas, thereby improving phase noise compensation precision and reducing signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing phase noise compensation method is used assuming common oscillator sharing, then device complexity is reduced, but phase noise compensation precision deteriorates leading to signal distortion
Solution Approach 1:
The patent segments the phase noise compensation process by separately acquiring phases for each transmit antenna and each receive antenna independently, rather than assuming a common oscillator. This allows precise tracking of individual antenna phases while maintaining manageable system complexity through modular phase acquisition and compensation steps.
Solution Approach 2:
The patent implements feedback by acquiring the actual phase of each antenna through pilot subcarriers and using this measured phase information to compensate received signals. The phase is continuously tracked and fed back into the compensation process, ensuring accurate correction without requiring complex hardware changes.
2Measurement precision
If individual oscillator per antenna is used, then phase noise compensation precision is improved, but device complexity increases
Solution Approach 1:
The system performs self-service by using pilot subcarriers embedded in the transmitted signal to automatically measure and track the phase of each antenna. This self-measurement approach eliminates the need for additional external measurement equipment or complex synchronization hardware, achieving high precision while keeping the system relatively simple.
3Reliability
If existing compensation method is applied to non-common oscillator system, then ease of operation is maintained, but signal quality deteriorates due to low compensation precision
Solution Approach 1:
The patent changes the operational parameter from assuming a common oscillator model to individually measuring and compensating each antenna's phase. This parameter change in the compensation approach allows the system to adapt to non-common oscillator configurations while maintaining ease of operation through standardized phase acquisition and compensation procedures.
Data Source
AI summary
Embodiments of the present disclosure provide a signal processing method, an apparatus, and a system. The signal processing method includes acquiring a phase of each of transmit antennas when the l.sup.th OFDM data symbol is sent, and acquiring a phase of each of receive antennas when the l.sup.th OFDM data symbol is received. The method further includes compensating received signals of each of the receive antennas according to the phase of each of the transmit antennas when the l.sup.th OFDM data symbol is sent and the phase of each of the receive antennas when the l.sup.th OFDM data symbol is received, to obtain compensated signals of each receive antenna.