Asymmetric Frequency Spreading for Phase Error and Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio communication technologies face phase-related errors due to frequency spreading impairments, which are not fully mitigated by current calibration methods, leading to increased phase noise and power consumption in digitally controlled oscillators.
Innovation Solution
Implementing a frequency spreading controller that dynamically adjusts the frequency offset based on the margin between the signal frequency and the sub-band limits, using a digital phase locked loop and accumulator to integrate and subtract phase offsets from phase modulation commands, thereby maintaining a sufficient margin and reducing phase errors without requiring large sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency spreading is used to mitigate phase errors, then phase modulation accuracy is improved, but phase noise and power consumption increase
Solution Approach 1:
The patent dynamically adjusts the frequency offset parameter based on signal conditions and margin requirements, rather than using fixed frequency spreading. This allows the system to achieve sufficient phase error mitigation with minimal frequency offset, thereby reducing power consumption while maintaining phase modulation accuracy
Solution Approach 2:
The system transitions from static frequency spreading to dynamic frequency offset adjustment. The frequency offset is continuously adapted based on real-time margin calculations between signal frequency and sub-band limits, allowing the system to use only the necessary amount of frequency spreading to maintain phase accuracy, thus reducing unnecessary power consumption
2Adaptability or versatility
If large sub-bands are used to accommodate frequency spreading, then frequency modulation range is improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetric frequency offset adjustment where the offset magnitude is determined by the actual margin requirement rather than using symmetric large sub-bands. This allows the system to achieve the needed frequency modulation range with smaller, more efficiently managed sub-bands, reducing device complexity
Solution Approach 2:
Instead of allocating full large sub-bands for potential maximum frequency spreading, the system applies partial frequency offset adjustment based on actual margin requirements. This partial action approach achieves sufficient frequency modulation range while avoiding the complexity of configuring and managing large sub-bands
3Reliability
If frequency offset is increased to maintain margin, then phase error mitigation is improved, but signal frequency stability deteriorates
Solution Approach 1:
The system implements feedback control where the frequency offset is continuously adjusted based on the calculated margin between signal frequency and sub-band limits. This closed-loop approach ensures that frequency offset is applied only to the extent necessary to maintain the required margin, achieving phase error mitigation while minimizing impact on signal frequency stability
Solution Approach 2:
The system proactively adjusts frequency offset in advance to maintain sufficient margin before phase errors can significantly degrade performance. By anticipating margin requirements and applying appropriate frequency offset preemptively, the system mitigates phase errors while maintaining frequency stability through controlled, predetermined adjustments
Data Source
AI summary
A wireless communication device for asymmetrical frequency spreading including a processor configured to receive a frequency band message comprising a maximum difference and a minimum difference, wherein the maximum difference is between a maximum frequency of a sub-band and a signal frequency, and wherein the minimum difference is between the minimum frequency of the sub-band and the signal frequency compare the maximum difference and the minimum difference with each other; and generate a frequency shift based on the comparison.