UWB Receiver Feedback for Frequency Offset Compensation
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Solution Overview
Problem
Existing UWB systems face challenges with inaccuracies in frequency offsets, clock drift, and power consumption, limiting their effectiveness and compliance with regulatory emission requirements.
Innovation Solution
The UWB receiver design includes an RF front end circuit with amplifiers, filters, and mixers, along with advanced encoding schemes like Encoded Bundle Pulse Modulation (EBPM) and clock controllers to mitigate frequency offsets and improve power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional UWB systems use standard frequency sources and clock circuits, then device complexity is reduced, but frequency offset accuracy and clock drift compensation deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures the frequency offset between received signals and local oscillator, then feeds this information back to adjust the local oscillator frequency. This closed-loop feedback system continuously compensates for frequency offsets, improving measurement precision while managing device complexity through automated correction.
Solution Approach 2:
The patent dynamically changes the operating parameters of the frequency source and clock circuits based on measured conditions. By adjusting frequency offsets and timing parameters in real-time, the system achieves higher accuracy without permanently increasing hardware complexity, as the same circuits adapt their parameters rather than requiring additional dedicated components.
2Measurement precision
If UWB systems use higher power transmission to improve signal quality and ranging accuracy, then measurement precision improves, but power consumption increases
Solution Approach 1:
The patent employs dynamic power adjustment where the transmission power is varied based on communication conditions and ranging requirements. Instead of operating at constant high power, the system adapts power levels dynamically, using higher power only when needed for signal quality or ranging accuracy, thereby reducing overall power consumption while maintaining measurement precision when required.
Solution Approach 2:
The patent uses periodic measurement and adjustment cycles where power levels are optimized in discrete steps rather than continuously. By periodically assessing signal quality and ranging accuracy requirements, the system adjusts power levels in controlled intervals, achieving necessary precision while minimizing unnecessary power consumption during stable operation periods.
3Productivity
If UWB receivers use complex modulation coding schemes to improve spectral efficiency and data throughput, then productivity increases, but device complexity increases
Solution Approach 1:
The patent divides the complex signal processing into separate functional modules, each handling specific aspects of modulation and coding. By segmenting the processing chain into distinct stages (modulation, coding, equalization, detection), the system achieves high productivity through sophisticated schemes while managing device complexity through modular architecture, where each module can be optimized independently.
4Use of energy by moving object
If UWB systems use low frequency master clocks to reduce power consumption, then power efficiency improves, but measurement precision for ranging deteriorates
Solution Approach 1:
The patent introduces intermediary circuits and algorithms that bridge the gap between low-frequency clocks and high-precision ranging requirements. These intermediaries include fine-tuning mechanisms and compensation algorithms that enhance the effective resolution of low-frequency clocks, enabling accurate ranging measurements without requiring high-frequency master clocks, thus maintaining power efficiency while improving measurement precision.
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
The solution enhances UWB receivers' accuracy and power efficiency, enabling compliant operation with reduced power consumption and improved spectral efficiency.
Implementation Method 1
an antenna for receiving wireless signals coupled to a signal processing circuit
Implementation Method 2
a first amplifier coupled to the antenna
Implementation Method 3
a first filter coupled to the output of the first amplifier
Implementation Method 4
a mixer coupled to the output of the first filter and receiving a clock signal
Data Source
AI summary
Ultra-Wideband (UWB) wireless technology transmits digital data as modulated coded impulses over a very wide frequency spectrum with very low power over a short distance. Accordingly, the inventors have established UWB devices which accommodate and adapt to inaccuracies, errors, or issues within the implemented electronics, hardware, firmware, and software. Beneficially, UWB receivers may accommodate offsets in absolute frequency between their frequency source and the transmitter, accommodate drift arising from phase locked loop and/or from relative clock frequency offsets of the remote transmitter and local receiver. UWB devices may also employ modulation coding schemes offering increased efficiency with respect to power, data bits per pulse transmitted, and enabled operation at higher output power whilst complying with regulatory emission requirements. Further, UWB devices may support a ranging function with range/accuracy not limited to the low frequency master clock employed within these devices enabling operation with ultra-low power consumption.