Phase Noise Compensation in Wireless Communication Apparatus
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Solution Overview
Problem
In wireless communication systems using high frequency bands like millimeter waves, phase noise causes interference between subcarriers, leading to decreased throughput due to improper phase noise compensation when the complex phase rotation is not accurately accounted for across the frequency band.
Innovation Solution
A wireless communication apparatus that generates a transmit signal with a pilot signal in the effective bandwidth, calculates a coefficient to compensate for phase noise based on the distance between communication apparatuses, and uses this coefficient to generate a phase noise replica, allowing for effective phase noise compensation and reduced interference between subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase noise compensation is performed without accurately accounting for complex phase rotation across the frequency band, then compensation complexity is reduced, but interference between subcarriers increases leading to decreased throughput
Solution Approach 1:
The patent applies parameter changes by using multiple different parameters (first, second, and third parameters) to represent phase rotation characteristics at different frequency positions. Instead of using a single uniform compensation parameter, the system adapts the compensation parameter based on the specific frequency position, thereby reducing interference between subcarriers while maintaining manageable compensation complexity.
Solution Approach 2:
The patent implements local quality by applying different phase compensation parameters to different frequency positions within the frequency band. The first parameter is used for first frequency positions, the second parameter for second frequency positions, and the third parameter for third frequency positions. This localized approach ensures that each subcarrier group receives appropriate compensation tailored to its specific frequency characteristics, reducing overall interference.
2Ease of operation
If uniform phase compensation parameter is used across the frequency band, then compensation process is simplified, but interference between subcarriers increases due to inaccurate phase rotation accounting
Solution Approach 1:
The patent changes the compensation parameter based on frequency position by introducing multiple parameters (first, second, third parameters) corresponding to different frequency ranges. This allows the system to maintain relative operational simplicity while adapting to the varying phase rotation characteristics across the frequency band, thereby reducing subcarrier interference without overly complicating the compensation process.
Solution Approach 2:
The patent segments the frequency band into multiple regions (first, second, and third frequency positions) and applies different compensation parameters to each segment. This segmentation approach balances simplicity and effectiveness by dividing the complex frequency band into manageable portions, each handled with appropriate compensation while maintaining an overall structured and relatively simple compensation framework.
3Object-affected harmful factors
If multiple different parameters are used for phase compensation at different frequency positions, then interference between subcarriers is reduced, but compensation complexity increases
Solution Approach 1:
The patent manages parameter complexity by systematically using multiple parameters (first, second, third parameters) that correspond to different frequency positions. While this increases compensation complexity compared to a single-parameter approach, the structured organization of parameters by frequency position allows for efficient implementation and reduces subcarrier interference through accurate, position-specific phase rotation compensation.
Data Source
AI summary
A first wireless communication apparatus assigns a pilot signal without an effective signal component at least in an adjacent frequency component to a generated transmit signal, and transmits the transmit signal including the pilot signal. A second wireless communication apparatus converts the received signal or a frequency-converted signal obtained by frequency conversion of the signal into a signal in a frequency domain, sets an approximate value of the distance between the second wireless communication apparatus and the first wireless communication apparatus, calculates a coefficient γk, based on the approximate value of the distance, the effective bandwidth, the speed of light, the number of FFT points, and the frequency component number, extracts a signal in the frequency domain, generates a phase noise compensated sampling signal, and reproduces data transmitted by the first wireless communication apparatus.