Modulation Data Processing for PAPR Reduction
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Solution Overview
Problem
In communications systems, data with high peak to average power ratio (PAPR) experiences reduced output power and poorer receiver performance due to non-linear amplification, necessitating a method to reduce PAPR for efficient amplification and improved receiver performance.
Innovation Solution
A data transmission method involving modulation data processing, including Fourier transform and inverse Fourier transform, to generate time-domain sending data with a lower PAPR, specifically by extending the length of modulation data and performing phase shifts and filtering to correlate data elements, thereby reducing PAPR to less than 2 dB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time domain data with high PAPR is amplified by power amplifier, then data transmission can be performed, but output power is reduced and receiver performance deteriorates
Solution Approach 1:
The patent changes the PAPR parameter of the time domain data by introducing correlation among data elements through modulation data processing. This transforms the statistical characteristics of the signal, reducing peak power occurrences and improving both output power and receiver performance after PA amplification.
2Power
If modulation data length is extended and processing operations are added, then PAPR is reduced, but device complexity increases
Solution Approach 1:
The patent performs modulation data processing in advance before the data enters the power amplifier. By pre-establishing correlation among data elements through Fourier transform and phase shift operations, the system reduces PAPR proactively, avoiding the need for complex real-time processing or post-amplification correction mechanisms.
Data Source
AI summary
This application provides example data transmission methods and apparatuses, so that a PAPR of time-domain sending data can be reduced. One example method includes a transmit end performing modulation data processing on first modulation data whose length is M1, to obtain second modulation data whose length is M2, where M1<M2, M1 and M2 are positive integers, and each modulation data in the second modulation data is an element in the first modulation data. The transmit end then performs sending preprocessing, such as phase shift, Fourier transform, inverse Fourier transform, or time/frequency domain filtering on the second modulation data to obtain time-domain sending data of one symbol. The transmit end then sends the time-domain sending data on the one symbol.