RF Signal Receiver Phase Conversion Circuit
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Solution Overview
Problem
RFID systems face challenges in reducing tag and reader costs due to complex circuits required for phase compensation and noise elimination in received signals, as well as difficulties in accurately decoding data with varying transmission speeds and noise presence.
Innovation Solution
A radio frequency signal receiver is designed with a phase converting unit producing multiple output signals of different phases, decoding units that include noise eliminators and data rate estimators, and a data selecting unit that chooses the most accurate signal based on CRC codes, eliminating the need for complex phase restoration circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex phase compensation circuit is used to restore the phase of the received signal, then the data restoration accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the complex phase compensation circuit from the receiver by utilizing the inherent phase information in the preamble signal. The phase converting unit processes the received signal through multiple phase angles without requiring traditional phase compensation hardware, thereby simplifying the device while maintaining data restoration accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-processing the signal through a phase converting unit that generates multiple phase-converted signals before decoding. The preamble detector identifies the actual phase angle in advance, allowing the system to select the correct phase-converted signal for data detection, thus avoiding the need for complex post-reception phase compensation circuits.
2Reliability
If traditional decoding methods are used without noise elimination, then the device complexity is reduced, but the decoding accuracy deteriorates when noise is present in the signal
Solution Approach 1:
The patent applies preliminary action by incorporating a noise eliminator that processes the phase-converted signal before decoding. The noise eliminator removes noise components from the signal in advance, ensuring that the subsequent data detector receives a clean signal. This approach improves decoding accuracy without requiring complex error correction circuits.
Solution Approach 2:
The noise eliminator acts as an intermediary component between the phase converting unit and the data detector. It processes the phase-converted signal by removing noise components while preserving the essential data information, thereby improving the reliability of decoding without significantly increasing device complexity.
3Measurement precision
If the data rate is not accurately estimated, then the decoding process is simpler, but the data restoration accuracy deteriorates when the transmission speed varies
Solution Approach 1:
The patent implements feedback by using the detected preamble signal to estimate the data rate of the received signal. The estimated data rate is fed back to adjust the decoding process, ensuring that the system adapts to varying transmission speeds. This feedback mechanism improves data restoration accuracy without requiring complex external synchronization systems.
Data Source
AI summary
The present invention relates to a radio frequency signal receiver, and more particularly, to a radio frequency signal receiver of a communication system, in which local devices exchange a radio frequency signal with each other. The object of the present invention is to provide a radio frequency signal receiver that exactly restores data from a received signal without a complex circuit restoring a phase of a received signal. It is another object of the present invention to provide a radio frequency signal receiver that eliminates noise when the noise is included in the received signal, estimates an exact data rate of the received signal, and exactly restores received information based on the estimated data rate thereof.The radio frequency signal receiver includes: a phase converting unit converting a phase of a received digital signal to predetermined angles to produce a plurality of output signals having different phases; and decoding units decoding the plurality of output signals from the phase converting unit, respectively.According to the present invention, data may be restored from a received signal without a complex circuit restoring a phase of a received signal. Moreover, when noise is included in the received signal, the noise is eliminated, an exact data rate of the received signal is estimated, and received information may be exactly restored.