PAPR Reduction via Phase Shifted Control Fields
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Solution Overview
Problem
Channel bonding in telecommunications leads to increased Peak-to-Average Power Ratio (PAPR) of signals due to constructive interaction between identical control fields in bonded channels, which can result in non-linear gain characteristics and signal distortion for power amplifiers.
Innovation Solution
Applying different phase shifts to control fields such as short training fields, channel estimation fields, and header fields across bonded channels to create time domain offsets, reducing the constructive interaction and thereby decreasing the PAPR of the amplified signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If identical control fields are transmitted in bonded channels, then channel bonding performance is improved, but PAPR increases causing non-linear gain and signal distortion
Solution Approach 1:
The patent applies asymmetry by introducing different phase shifts to identical control fields transmitted over bonded channels. Specifically, a first phase shift is applied to control fields in a first component channel while a second phase shift (different from the first) is applied to control fields in a second component channel. This asymmetric treatment breaks the symmetry of identical signals, preventing constructive interference that causes high PAPR while maintaining the benefits of channel bonding.
2Object-affected harmful factors
If phase shifts are applied to control fields, then PAPR is reduced, but signal transmission complexity increases
Solution Approach 1:
The patent employs parameter changes by modifying the phase parameter of control fields transmitted over bonded channels. Different phase values (first phase shift and second phase shift) are applied to control fields in different component channels. This parameter modification effectively reduces PAPR by preventing signal peaks from aligning constructively, while the complexity increase is minimal since it only requires phase adjustment rather than complete signal redesign.
Data Source
AI summary
It is possible to reduce the PAPR of an amplified signal communicated over bonded channels by applying different phase shifts to control fields communicated over the bonded channels. The phase shifts reduce the amount of constructive interaction between the control fields by shifting the peaks of the respective signals in the time domain. The control fields may include short training fields (STFs), channel estimation (CE) fields, or header fields communicated over bonded channels.