Conjugate Data Modulation for Phase Noise Compensation
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Solution Overview
Problem
Current techniques for phase noise compensation in wireless communications, particularly at higher frequency carrier frequencies, are inadequate as they require significant communication resources and processing power but fail to produce satisfactory results.
Innovation Solution
The implementation of conjugate data modulation, where user data is modulated and interleaved with conjugate data elements, which are then concatenated with pilot sequences to form a data sequence that reduces phase error and improves demodulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current phase noise compensation techniques are used, then phase noise reduction is attempted, but significant communication resources and processing power are required while still failing to produce satisfactory results
Solution Approach 1:
The data sequence is segmented into conjugate data pairs (first data and second data) where the second data is the complex conjugate of the first data. This segmentation allows the receiver to process paired elements and eliminate phase noise through mathematical operations on conjugate pairs, reducing the need for complex overall compensation mechanisms.
Solution Approach 2:
The system uses feedback by transmitting conjugate pairs and using the known relationship between them at the receiver to estimate and compensate for phase noise. The receiver utilizes the conjugate relationship as feedback information to calculate phase error and correct the received signal, reducing dependency on external compensation resources.
2Reliability
If phase noise compensation is attempted at higher frequency carrier frequencies, then phase noise reduction is pursued, but phase noise becomes more acute and current techniques fail to produce satisfactory results
Solution Approach 1:
The invention converts the harmful phase noise into a beneficial effect by using conjugate data pairs. The phase noise affects both elements of a conjugate pair in a predictable manner, and by processing the conjugate relationship, the system can eliminate the phase noise effect. This transforms the harmful phase noise into a condition that can be mathematically removed, improving demodulation performance at high frequencies.
3Productivity
If conventional data modulation is used, then data transmission is achieved, but phase error degrades demodulation performance
Solution Approach 1:
The system performs preliminary action by pre-processing the data into conjugate pairs before transmission. The conjugate relationship is established in advance at the transmitter, which enables the receiver to perform phase error elimination through simple mathematical operations on the received conjugate pairs, improving demodulation accuracy without complex real-time processing.
Data Source
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AI summary
This disclosure relates generally to wireless communications and, more particularly, to systems and methods for modulating user data with conjugate data for time domain communications. In one embodiment, a method performed by a device includes: modulating user data into modulated user data elements; determining conjugate data elements, wherein each conjugate data element is a conjugate or opposite conjugate of different modulated user data elements; and transmitting, over a time domain, a user data sequence comprising the modulated user data elements interleaved with the conjugate data elements.