Symbol Timing in Phase Domain for RF Receiver Complexity Reduction
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Solution Overview
Problem
Conventional symbol timing synchronization methods in radio frequency receivers are complex and costly due to the need for complex multiplications and additions, leading to high implementation costs and power consumption.
Innovation Solution
The method performs symbol timing in the phase domain using real additions instead of complex multiplications, determining symbol timing based on phase information extracted from inphase and quadrature data, and accounting for frequency offsets through phase differences, allowing for a simpler structure and lower complexity in radio frequency receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional symbol timing synchronization methods are used, then symbol timing can be determined, but implementation costs and power consumption are high due to complex multiplications and additions
Solution Approach 1:
The patent transforms the symbol timing determination from the complex signal domain to the phase domain by changing the parameter space. Instead of using complex multiplications and additions on the original signal, the method extracts phase information and performs operations in the phase domain using only real additions, thereby reducing computational complexity while maintaining timing accuracy
Solution Approach 2:
The patent replaces the mechanical/computational operation of complex multiplications and additions with a simpler phase extraction and real addition process. By substituting the complex arithmetic operations with phase domain operations, the system achieves the same timing synchronization function with reduced computational burden
2Measurement precision
If conventional symbol timing synchronization methods are used, then symbol timing can be determined, but power consumption is high due to complex multiplications and additions
Solution Approach 1:
By changing from signal domain parameters to phase domain parameters, the patent eliminates the need for power-intensive complex multiplications. The phase extraction and subsequent real additions consume significantly less power while preserving the ability to accurately determine symbol timing
Solution Approach 2:
The patent extracts only the essential phase information from the complex signal, discarding the magnitude information that is not needed for timing determination. This extraction process removes the computational burden of processing full complex values, thereby reducing power consumption
3Device complexity
If symbol timing is determined without accounting for frequency offsets, then calculation is simpler, but accuracy deteriorates in the presence of frequency offsets
Solution Approach 1:
The patent performs preliminary phase differencing operations that inherently compensate for frequency offsets before symbol timing determination. By taking the difference between adjacent phase samples, the method pre-corrects for linear phase drift caused by frequency offsets, ensuring accurate timing even in offset conditions
Solution Approach 2:
The phase differencing operation provides implicit feedback about frequency offset conditions, allowing the system to adaptively determine timing without requiring explicit offset estimation. The phase difference information feeds into the timing determination process, automatically compensating for offset effects
Data Source
AI summary
The present invention provides for receiving a radio frequency signal which encodes transmitted data, and for outputting data corresponding to the transmitted data. The radio frequency signal is received and converted to inphase and quadrature data. Phase information is extracted from the inphase and quadrature data. A symbol timing for the radio signal is determined based on the extracted phase information. The transmitted data encoded within the radio frequency signal is detected and processed based on the determined symbol timing. Data is output based on the detected and processed transmitted data. Since symbol timing is determined based on phase information, in the phase domain, a radio frequency receiver can be constructed with a lower complexity and a simpler structure.