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Signal Detection for Ambient Backscatter Communication with OFDM Carriers
Thu L N Nguyen1, Yoan Shin2, Jin Young Kim3
1School of Electronic Engineering, Soongsil University, Seoul 06978, Korea. thunguyen@ssu.ac.kr.
Sensors (Basel, Switzerland)
|January 30, 2019
Summary
This study optimizes energy detectors for ambient backscatter communication (AmBC) by calculating optimal averaging power orders. It also enhances bit error rate estimation by mitigating interference in ambient OFDM signals.
Area of Science:
- Electrical Engineering
- Wireless Communication
- Signal Processing
Background:
- Ambient backscatter communication (AmBC) is a low-cost, convenient emerging technology.
- Existing AmBC systems require optimized energy detection for improved performance.
- Interference, particularly direct-link interference, poses a challenge in AmBC systems.
Purpose of the Study:
- To determine the optimal energy detector for AmBC systems.
- To estimate the bit error rate (BER) for AmBC systems with optimized detectors.
- To improve the performance of AmBC by mitigating interference.
Main Methods:
- Theoretical and numerical analysis of AmBC systems.
- Optimization of averaging power orders for energy detectors.
- Exploitation of cyclic prefix in orthogonal frequency division multiplexing (OFDM) signals for interference cancellation.
- Derivation of a test statistic for optimal detection threshold and power order.
Main Results:
- Improved energy detector performance through optimal averaging power orders.
- Effective cancellation of direct-link interference using cyclic prefix in ambient OFDM signals.
- Derivation of optimal detection thresholds and power orders for enhanced AmBC systems.
Conclusions:
- The study provides a method for optimizing energy detectors in AmBC systems.
- Identified inherent limitations in current AmBC energy detectors.
- Offers guidance for achieving optimal power order for a given significance level in AmBC.
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