IR-UWB System Using 1-Bit Digital Sampler for Low Power Signal Recovery
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Solution Overview
Problem
Existing impulse radio-based ultra wideband (IR-UWB) communication systems face challenges in achieving low power consumption and low complexity due to the high complexity and cost of digital signal recovery and synchronization processes, particularly in converting ultra wideband impulses to digital signals and maintaining precise time synchronization.
Innovation Solution
An IR-UWB communication system utilizing a 1-bit digital sampler for signal recovery and bit decision window-based synchronization, along with an integrated impulse generator for OOK and PPM modulation, simplifies the system by reducing the need for high-speed ADCs and complex PLLs, and employs a two-stage envelope detector and comparator for signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-speed ADC with bandwidth greater than 1 GHz and sample rate of several Gsps is used for signal recovery, then signal recovery precision is improved, but device complexity and power consumption increase significantly
Solution Approach 1:
The patent replaces the expensive high-speed ADC with a simple 1-bit digital sampler that operates at lower speeds. Instead of using a complex, costly high-performance converter, the invention employs a basic sampling mechanism that achieves sufficient signal recovery through alternative processing methods, thereby reducing device complexity and cost while maintaining acceptable performance.
Solution Approach 2:
The patent substitutes the traditional high-speed analog-to-digital conversion mechanism with a digital signal processing approach. Instead of relying on a complex hardware ADC system, the invention uses digital correlation and processing techniques to recover signals, effectively replacing the mechanical/electronic conversion system with a digital processing system that is simpler and more energy-efficient.
2Measurement precision
If a precise phased lock loop with high sample rate is used for synchronization, then synchronization precision is improved, but power consumption increases
Solution Approach 1:
The patent employs a bit decision window approach that uses a portion of the symbol period for synchronization rather than requiring continuous high-precision tracking throughout the entire transmission time. By concentrating synchronization efforts during specific critical windows and using lower-rate sampling during other periods, the system achieves sufficient synchronization precision while significantly reducing overall power consumption compared to continuous high-rate precise tracking.
3Adaptability or versatility
If a module-based impulse generator is used, then impulse generation capability is improved, but device complexity increases
Solution Approach 1:
The patent integrates the impulse generation function directly into the transmitter's digital signal processing unit, merging the impulse generation capability with the existing digital logic rather than using a separate module. This integration eliminates the need for additional standalone impulse generation hardware, thereby reducing overall device complexity while maintaining the ability to generate precise impulses for communication.
Data Source
AI summary
An impulse radio-based ultra wideband communication system, using an ultra wideband impulse and a 1-bit high-speed digital sampler, includes a transmitting RF module, a receiving RF module, a signal recovery unit, a transmitting signal processor, a receiving signal processor, and an ultra wideband antenna. The transmitting RF module includes an integrated impulse generator capable of implementing on-off-keying modulation and pulse position modulation, and an amplifier for amplifying output of the integrated impulse generator. The receiving RF module includes a two stage envelope detector for detecting a received signal and a comparator for converting the detected signal into a rectangular pulse. The signal recovery unit restores the signal from the receiving RF module to a digital signal using the 1-bit digital sampler. The signal processor includes a receiving signal processor for synchronizing the digital signal and decoding the detected signal. The ultra wideband antenna transmits and receives an ultra wideband signal.