Coherent query scheme for wireless backscatter communication systems with single tag

Abstract

An un-coded multi-transmitter query scheme is introduced for wireless backscatter communication systems in which M transmitters and N receivers are used for single-tag connectivity (M × 1 × N). The main idea is to harden the wireless communication channel with a tag device for high data rate readings. The proposed method is designed for multipath fading channels in which the backscatter channel is a multiplicative Rayleigh. A coherent transmit query scheme is used to increase the tag-reflected signals and simultaneously alter the fading statistics in the forward path by implementing a receiver feedback. Full-diversity performance and array gain is achieved using the receiver diversity without requiring any tag antenna diversity. Therefore, the tag device remains simple. Mathematical expressions for the probability density function (PDF) of the backscatter channel are presented using closed-form equations. Bit error rate (BER) simulations for the binary phase shift keying (BPSK) modulation are computed numerically. Diversity gain of 10 dB is obtained by using a 2 × 1 × 1 scheme. The results show that the transmit diversity for single-tag usage performs the same as the tag antenna diversity, at the expense of a moderate transmitter complexity. The tag device remains intact as a requirement for the simplicity and size constraints. Also, the system realization becomes more feasible due to the available space on the transmitter side to accomplish the uncorrelated forward channel conditions. The feasibility study is demonstrated using softwaredefined radio (SDR) implementations.

The State of AI-Empowered Backscatter Communications: A Comprehensive Survey

“…neighboring nodes; consequently, they lack information and scheduling for signal transmission [35]. In this manner, all nodes transmit data simultaneously, causing interference between the backscattered signals of different nodes, ultimately degrading the quality of the received signal [36]. c) Information Confidentiality: BC system utilizes RF signals for transmission, and these RF signals are typically vulnerable to eavesdropper attacks.…”

The State of AI-Empowered Backscatter Communications: A Comprehensive Survey

“…The transmitting nodes cannot receive feedback from neighboring nodes; consequently, they lack information and scheduling for signal transmission [38]. In this manner, all nodes transmit data simultaneously, causing interference between the backscattered signals of different nodes, ultimately degrading the quality of the received signal [39]. c) Information Confidentiality: BC system utilizes RF signals for transmission, and these RF signals are typically vulnerable to eavesdropper attacks.…”

Robust interference cancellation for differential quadrature phase-shift keying modulation with band limiting and adaptive filter

“…Comparison of the performance of various types of basic modulation techniques is carried out in various studies to see the performance of BER, Eye diagram, and constellation diagram respectively on additive white Gaussian noise (AWGN), Rayleigh and Rician channels using MATLAB Simulink, graphical user interface (GUI), and BER tool on OFDM systems, code division multiple access (CDMA) to optical systems. The goal is to see the efforts to suppress inter symbol interference (ISI) and/or multipath fading with the simulation [6]- [13]. Performance comparison of optical fiber is found in [14], [15].…”