Waveform Shaping for User Equipment Transmit Power
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Solution Overview
Problem
Wireless communication networks face interference and performance degradation due to the difficulty in generating signals with high dynamic ranges, leading to distortion and reduced communication capabilities in user equipment (UE) without expensive circuitry or maximum power reduction (MPR) techniques.
Innovation Solution
User equipment (UE) performs waveform shaping by adding excess bandwidth, resources, or tones to signals, reducing peak-to-average power ratio (PAPR), and indicating capabilities to the base station for configuration, thereby avoiding MPR and enhancing transmit power and communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If maximum power reduction (MPR) techniques are used to reduce distortion, then signal quality is improved, but transmit power level decreases
Solution Approach 1:
The patent applies parameter changes by modifying the waveform characteristics (excess bandwidth, excess tones, clipping) to alter the signal's peak-to-average power ratio. This enables the system to achieve acceptable signal quality without applying maximum power reduction, thereby maintaining higher transmit power levels while still reducing distortion effects
2Reliability
If expensive distortion-reducing circuitry is added to reduce signal distortion, then signal quality is improved, but device cost increases
Solution Approach 1:
The patent substitutes hardware-based distortion reduction circuitry with software-based waveform shaping techniques. By using digital signal processing methods (excess bandwidth allocation, tone reservation, clipping) instead of physical distortion-reducing circuitry, the system achieves signal quality improvement without increasing device complexity or cost
3Power
If waveform shaping with excess bandwidth is applied, then transmit power level is improved, but signal bandwidth increases
Solution Approach 1:
The patent applies partial or excessive action by allocating excess bandwidth and excess tones beyond the minimum required for signal transmission. This excess allocation serves to reduce the peak-to-average power ratio and enable higher transmit power levels, while the actual used bandwidth remains controlled. The excess resources act as a buffer to improve power efficiency
4Power
If waveform shaping techniques are used to reduce PAPR, then transmit power capability is improved, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by performing waveform shaping operations (excess bandwidth allocation, tone reservation, clipping) in advance during the signal generation phase. By pre-shaping the waveform before transmission, the system reduces PAPR and enables higher transmit power capability without adding complex real-time processing requirements during transmission
Data Source
AI summary
An apparatus for wireless communication by a user equipment (UE) includes a transmitter configured to transmit a UE capability message indicating one or more waveform shaping capabilities of the UE. The apparatus further includes a receiver configured to receive a configuration message indicating a waveform shaping configuration in accordance with the one or more waveform shaping capabilities. The transmitter is further configured to transmit a signal in accordance with the waveform shaping configuration. The signal has a transmit power level associated with the waveform shaping configuration.