UWB Receiver Carrier Timing Recovery Digital Processing
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Solution Overview
Problem
Existing ultra-wideband (UWB) communication systems face inefficiencies in performing carrier recovery and timing recovery in the digital domain, particularly in compact and low-power devices like RFID tags, where prior art techniques consume excessive power and are less than optimal.
Innovation Solution
A method for a UWB receiver that performs both carrier and timing recovery by developing complex estimates of the impulse response, using recursive product vectors and correlation to calculate error angles and phase errors, and employing a trit-based ADC for efficient signal processing, allowing for improved synchronism with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carrier recovery and timing recovery techniques are used in UWB receivers, then synchronism can be achieved, but power consumption increases and circuit complexity increases
Solution Approach 1:
The patent combines carrier recovery and timing recovery operations into a unified digital domain processing framework. By integrating these functions and performing them alongside channel estimation in the digital baseband, the system achieves synchronism while reducing overall power consumption compared to separate conventional implementations.
Solution Approach 2:
The patent replaces traditional analog or mixed-signal carrier and timing recovery circuits with digital signal processing operations. By implementing recovery algorithms in the digital domain using processed baseband samples, the system eliminates complex analog circuitry and reduces power consumption while maintaining synchronism performance.
2Reliability
If conventional carrier recovery and timing recovery techniques are used in UWB receivers, then synchronism can be achieved, but device complexity increases
Solution Approach 1:
The patent merges carrier recovery, timing recovery, and channel estimation functions into a single integrated digital processing pipeline. This consolidation eliminates the need for separate analog circuits for each function, thereby reducing overall device complexity while achieving reliable synchronism.
Solution Approach 2:
The patent substitutes complex analog carrier and timing recovery circuits with digital signal processing algorithms. By performing all recovery operations in the digital domain using baseband samples, the system simplifies the hardware architecture and reduces circuit complexity while maintaining synchronism performance.
3Measurement precision
If channel matched filter is used to convolve conditioned signal with conjugate CIR estimate, then signal-to-noise ratio is improved, but processing time increases
Solution Approach 1:
The patent performs channel estimation and develops the conjugate CIR estimate during the reception of the training sequence portion of the preamble, before the actual data reception begins. By preparing the channel compensation data in advance, the system can apply the matched filter more efficiently during data reception, reducing overall processing time while maintaining SNR improvement.
Data Source
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AI summary
In an ultra-wideband ("UWB") receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode of operation, the samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response ("OR") are developed. When a start-of-frame delimiter ("SFD") is detected, the best OR estimate is provided to a channel matched filter ("CMF"). During a data recovery mode of operation, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation.