Coherent Multiantenna Receiver for BPSK-Modulated Ambient Backscatter Tags

Ambient backscatter communication (AmBC) is an emerging technology enabling green Internet of Things deployments. The widespread acceptance this paradigm limited by the low signal-to-interference-plus-noise ratio (SINR) signal impinging on receiver antenna due to strong direct path interference and unknown ambient signal. adverse impact these two factors can be mitigated using noncoherent multiantenna receivers, which are known require a higher SINR reach bit-error-rate (BER) performance coherent receivers. However, considering signal, location AmBC tags, varying channel conditions, receivers for systems rarely studied in literature. In article, receiver, requires no prior information decoding binary-phase-shift-keying (BPSK) modulated presented. proposed compared with ideal that has perfect phase information, also assumes distributions offset caused excess length path. Comparative simulation results show designed achieve same BER 1-dB more SINR, corresponds 5-dB or gain respect reception on-off-keying signals. Variation detection tag shows coverage area close vicinity transmitter larger region around consistent theoretical results.