Signal Acquisition Blanking Compensation for Receive-While-Transmit
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Solution Overview
Problem
Existing signal acquisition systems fail to successfully acquire incoming signals during TTNT receive-while-transmit functionality due to collisions between received and transmitted signals, as they lack compensation for these collisions and do not adjust for the reduction in correlation metrics caused by such collisions.
Innovation Solution
The method involves a blanking block that asserts and de-asserts a blanking signal to compensate for collisions, allowing a correlation block to adjust the correlation metric or threshold based on the number of symbols blanked, enabling successful signal detection by varying the threshold or gain to account for signal collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit blanking is applied to compensate for signal collisions during receive-while-transmit operation, then signal acquisition reliability improves, but correlation metric accuracy deteriorates due to blanked symbols
Solution Approach 1:
The patent adjusts the correlation threshold parameter dynamically based on the number of blanked symbols. When transmit blanking removes certain symbols from the received signal, the system calculates a modified threshold that compensates for the reduced correlation sum, thereby maintaining detection accuracy despite the missing data points.
Solution Approach 2:
The system uses feedback from the blanking operation itself - by counting how many symbols were blanked during transmission, the receiver can determine the appropriate threshold adjustment. This feedback loop allows the system to adapt the detection criterion based on the actual amount of signal loss from blanking.
2Productivity
If concurrent transmit and receive operations are enabled in TTNT, then network productivity improves, but signal detection accuracy worsens due to self-interference and collisions
Solution Approach 1:
The patent extracts and removes the interfering transmitted signal portions from the received signal through blanking. By identifying when transmission occurs and selectively blanking those time periods in the received signal, the system eliminates self-interference and allows accurate detection of incoming signals during concurrent operations.
3Device complexity
If correlation threshold is kept fixed for simple processing, then device complexity is reduced, but detection reliability deteriorates when signal collisions occur
Solution Approach 1:
The patent transitions from a static fixed threshold to a dynamic adaptive threshold that changes based on transmission conditions. The threshold is adjusted in real-time according to the number of blanked symbols, allowing the system to maintain high detection reliability while adapting to varying signal collision conditions without requiring complex processing architecture.
Data Source
AI summary
A method and apparatus for signal acquisition with transmit blanking compensation compensates for collisions between a desired received signal and a transmitted signal. A blanking block blanks a received signal when the transmitted signal is transmitted and stops blanking when the transmitted signal stops to provide a received signal with blanking. A correlation block correlates the received signal with blanking with a known sequence of symbols corresponding to the desired received signal and outputs a correlation metric and a number of symbols blanked. Means for adjusting the correlation metric or a variable threshold using the number of symbols blanked are provided. A decision block compares the adjusted correlation metric to a fixed threshold or the correlation metric to the variable threshold. If the adjusted correlation metric exceeds the threshold or if the correlation metric exceeds the variable threshold, the decision block determines that the desired signal is detected.