Signal Conditioning Module for Wireless Peak-to-Average Ratio Reduction
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Solution Overview
Problem
In wireless communications systems, high peak-to-average ratio (PAR) signals cause inefficiencies in digital-to-analog conversion and power amplifier stages, leading to signal clipping which increases spurious out-of-band emissions, damaging signal integrity and limiting efficiency.
Innovation Solution
A signal conditioning module that splits the baseband signal into multiple paths, delays one path, and combines them with adjusted gain factors to reduce signal amplitude PAR without clipping, thereby maintaining signal integrity and minimizing spurious emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If signal clipping is applied to reduce peak amplitude, then power amplifier efficiency is improved, but spurious out-of-band emissions increase and signal integrity deteriorates
Solution Approach 1:
The signal is divided into multiple paths with different delays and gain factors. By segmenting the signal processing into parallel paths and combining them, the patent reduces peak amplitude through constructive and destructive interference patterns rather than hard clipping, thereby maintaining signal integrity while improving power amplifier efficiency.
Solution Approach 2:
The patent changes the signal parameters by introducing variable delays and adjustable gain factors in different signal paths. By dynamically adjusting these parameters, the system controls the peak-to-average ratio without applying non-linear clipping, thus reducing spurious emissions while maintaining amplifier efficiency.
2Device complexity
If signal clipping is applied to bound signal envelope, then digital-to-analog converter bit-width requirements are reduced, but signal quality permanently deteriorates
Solution Approach 1:
The signal is segmented into multiple processed paths that are later combined. This segmentation allows the system to control signal amplitude through linear processing in each path rather than requiring high-bit-width D/A converters for peak clipping, while preserving signal quality through coherent combination of the paths.
3Use of energy by moving object
If more aggressive signal clipping is applied, then power amplifier efficiency increases, but out-of-band emissions increase
Solution Approach 1:
The patent uses variable delay and gain factor parameters to control signal amplitude. By adjusting these parameters, the system achieves the desired reduction in peak-to-average ratio without aggressive clipping, thereby improving power amplifier efficiency while minimizing out-of-band emissions through controlled parameter adjustment rather than non-linear distortion.
Data Source
AI summary
Techniques to reduce signal amplitude peak-to-average ratio (PAR) in a wireless communications system are described. The apparatus may include a signal conditioning module to receive a baseband signal. The signal conditioning module may split the baseband signal along multiple paths, delay one or more of the paths, and combine the multiple paths to form a conditioned signal having lower signal amplitude PAR than the baseband signal. Other embodiments are described and claimed.