TY - JOUR
T1 - Effects of Doppler-Division Multiplexing on OFDM Joint Sensing and Communication Systems
AU - Lang, Oliver
AU - Hofbauer, Christian
AU - Feger, Reinhard
AU - Huemer, Mario
PY - 2023
Y1 - 2023
N2 - A promising waveform candidate for future joint sensing and communication systems is orthogonal frequency-division multiplexing (OFDM). For such systems, supporting multiple transmit antennas requires multiplexing methods for the generation of orthogonal transmit signals, where equidistant subcarrier interleaving (ESI) is the most popular multiplexing method. In this work, we analyze a multiplexing method called Doppler-division multiplexing (DDM). This method applies a phase shift from OFDM symbol to OFDM symbol symbol to separate signals transmitted by different Tx antennas along the velocity axis of the range-Doppler map. The main focus of this work lies on the implications of DDM on the communication task. It will be shown that for DDM, the channels observed in the communication receiver are heavily time-varying, preventing any meaningful transmission of data when not taken into account. In this work, a communication system designed to combat these time-varying channels is proposed, which includes methods for data estimation, synchronization, and channel estimation.Bit error ratio (BER) simulations demonstrate the superiority of this communications system compared to ESI-based systems.
AB - A promising waveform candidate for future joint sensing and communication systems is orthogonal frequency-division multiplexing (OFDM). For such systems, supporting multiple transmit antennas requires multiplexing methods for the generation of orthogonal transmit signals, where equidistant subcarrier interleaving (ESI) is the most popular multiplexing method. In this work, we analyze a multiplexing method called Doppler-division multiplexing (DDM). This method applies a phase shift from OFDM symbol to OFDM symbol symbol to separate signals transmitted by different Tx antennas along the velocity axis of the range-Doppler map. The main focus of this work lies on the implications of DDM on the communication task. It will be shown that for DDM, the channels observed in the communication receiver are heavily time-varying, preventing any meaningful transmission of data when not taken into account. In this work, a communication system designed to combat these time-varying channels is proposed, which includes methods for data estimation, synchronization, and channel estimation.Bit error ratio (BER) simulations demonstrate the superiority of this communications system compared to ESI-based systems.
KW - OFDM
KW - Multiplexing
KW - Symbols
KW - Transmitting antennas
KW - Radar antennas
KW - Radar
KW - Communication systems
UR - https://ieeexplore.ieee.org/document/10360223/
U2 - 10.1109/OJSP.2023.3343308
DO - 10.1109/OJSP.2023.3343308
M3 - Article
SN - 2644-1322
VL - 1-9
SP - 1
EP - 9
JO - IEEE Open Journal of Signal Processing
JF - IEEE Open Journal of Signal Processing
ER -