Subcarrier Destructive Interference for Blanked PRB Leakage
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Solution Overview
Problem
Residual energy transmission within blanked Physical Resource Blocks (PRBs) in communication networks, caused by spectral leakage, sidelobes from modulation techniques, and power amplifier nonlinearity, leads to increased interference and reduced network performance, affecting both the intended network and adjacent frequency bands.
Innovation Solution
Implementing destructive signaling by generating a compensating waveform to destructively interfere with residual energy in blanked PRBs, using a destructive signaling controller to ensure coherent summing and minimize residual energy before amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRB blanking is implemented to mitigate interference, then network performance is improved, but residual energy transmission continues to cause interference
Solution Approach 1:
The patent applies destructive signaling to convert the harmful residual energy in blanked PRBs into a beneficial cancellation effect. By generating a compensating waveform that destructively interferes with the residual energy, the system transforms the harmful spectral leakage and sidelobes into a useful interference pattern that cancels out the unwanted energy transmission, thereby eliminating the harmful factors while maintaining the benefits of PRB blanking.
2Object-generated harmful factors
If destructive signaling is used to cancel residual energy, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements preliminary action by generating the compensating waveform before the signal reaches the power amplifier. The destructive signaling is performed in the digital domain prior to analog conversion and amplification, allowing the residual energy to be canceled out before it can cause interference. This preliminary processing approach reduces the complexity of subsequent analog signal processing and avoids the need for complex post-amplification correction mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces interference within the network and with adjacent frequency bands, enhancing network performance and quality of service by ensuring minimal residual energy in blanked PRBs.
Implementation Method 1
generating a compensating waveform that destructively interferes with the residual energy in the blanked PRBs
Data Source
AI summary
Embodiments of the present disclosure are directed to systems and methods for mitigating energy transmitted on subcarriers in a communications network. For example, a signal intended for transmission may be allocated with blanked Physical Resource Blocks (PRBs) and non-blanked PRBs. In order to reduce residual energy transmission within the blanked PRBs, selective filtering may be applied to a post-amplified waveform to mitigate unwanted energy introduced or exacerbated by power amplifiers in the communications network.