Backscatter Transmit Puncturing for Higher Signal Isolation
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Solution Overview
Problem
Backscattered signals in wireless networks often suffer from low power and are drowned out by the original source signal due to limited bandwidth, leading to a poor Signal-to-Interference Ratio (SIR), which affects the reliability and range of data transmission.
Innovation Solution
A transmitter adjusts the width of a puncture in the transmission signal to improve the SIR by positioning it at specific subcarriers within the data portion, allowing the receiver to isolate and decode the backscattered signal effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmitter uses limited bandwidth for backscatter communication, then power consumption is reduced, but the Signal-to-Interference Ratio (SIR) deteriorates causing the backscattered signal to be drowned out by the source signal
Solution Approach 1:
The transmitter divides the available bandwidth into multiple subcarriers and selectively applies puncturing to specific subcarrier groups. This segmentation allows the system to maintain low overall power consumption while creating localized high-SIR regions at punctured subcarriers where backscattered signals can be effectively decoded.
Solution Approach 2:
The patent applies puncturing only to specific subcarrier groups rather than uniformly across all subcarriers. This creates local quality variations where punctured subcarriers provide high SIR for backscatter detection, while non-punctured subcarriers maintain efficient data transmission, thus resolving the contradiction between low power consumption and reliable backscatter signal detection.
2Reliability
If the transmitter increases transmission power to improve backscatter signal quality, then the SIR improves, but network power regulations are violated
Solution Approach 1:
The transmitter dynamically adjusts the puncturing pattern across different resource elements and subcarriers based on channel conditions and backscatter device requirements. This dynamic puncturing allows the system to maintain compliance with average power regulations while providing sufficient instantaneous power at punctured subcarriers to ensure reliable backscatter signal detection.
Solution Approach 2:
The patent changes the frequency domain parameters by introducing punctured subcarriers with enhanced power allocation. This parameter change allows the transmitter to maintain overall power compliance while creating localized high-power regions that improve backscatter signal quality without violating network power regulations.
3Productivity
If the transmitter uses wide bandwidth for data transmission, then data rate increases, but the backscattered signal becomes harder to detect due to interference
Solution Approach 1:
The transmitter segments the wide bandwidth into multiple subcarrier groups and applies puncturing selectively to specific segments. This segmentation enables the system to maintain high overall data rate across non-punctured subcarriers while providing detectable backscatter signals at punctured subcarrier locations where interference is managed through the puncturing pattern.
Solution Approach 2:
The punctured subcarriers act as intermediaries that facilitate backscatter signal detection within the wide bandwidth transmission. These punctured elements serve as reference points or markers that help the receiver identify and decode backscattered signals amidst the high-rate data transmission on other subcarriers.
Data Source
AI summary
Improving backscattering and, specifically, a physical Layer transmit mode for improving the Signal-to-Interference Ratio (SIR) of backscatter signals may be provided. A transmitter may determine a Backscatter Device (BKD) to send a transmission to for backscattering. The transmitter may determine a width of a puncture in the transmission. Next, the transmitter may transmit the transmission to the BKD. The transmitter may receive feedback from a receiver about decoding a backscattered signal generated using the transmission. The transmitter may adjust the width of the puncture for a subsequent transmission based on the feedback.