OFDM-based Spatial Data Focusing for High Resolution 2-Dimensional Wireless Geocasting

An OFDM-based Spatial Data Focusing (OFDM-SDF) approach is proposed as an improvement over standard Time-based Spatial Data Focusing (T-SDF) as a means of wirelessly broadcasting information towards confined spatial locations, i.e. wireless geocasting. It is shown that this approach allows for 2-dimensional focusing, hence leading to far greater flexibility in terms of geocasting scenarios compared to T-SDF and beamforming, both limited to angular focusing only. This increased flexibility does not come at any trade-off costs in terms of spatial selectivity, and hence, just as T-SDF, OFDM-SDF is shown to establish a considerable increase in attainable geocasting accuracy when compared to traditional power focusing methods. This paper describes the free space OFDM-SDF system model for uniform linear antenna arrays, including beamsteering and sidelobe mitigation techniques. Based on simulations, the performance of OFDM-SDF is compared to both T-SDF, as well as classical beamforming.

[1]  François Horlin,et al.  Spatial Data Focusing Using Time and IQ Resources for Wireless Geocasting , 2019, 2019 IEEE Global Communications Conference (GLOBECOM).

[2]  Vincent Fusco,et al.  Orthogonal Vector Approach for Synthesis of Multi-Beam Directional Modulation Transmitters , 2015, IEEE Antennas and Wireless Propagation Letters.

[3]  Jun Li,et al.  Artificial-Noise-Aided Secure Transmission With Directional Modulation Based on Random Frequency Diverse Arrays , 2016, IEEE Access.

[4]  A. Hajimiri,et al.  Transmitter Architectures Based on Near-Field Direct Antenna Modulation , 2008, IEEE Journal of Solid-State Circuits.

[5]  M. Daly,et al.  Directional Modulation Technique for Phased Arrays , 2009, IEEE Transactions on Antennas and Propagation.

[6]  Aydin Babakhani,et al.  Ultra-wideband pulse-based directional modulation , 2015, 2015 IEEE MTT-S International Microwave and RF Conference (IMaRC).

[7]  François Horlin,et al.  Spatial Data Focusing: An Alternative to Beamforming for Geocasting Scenarios , 2018, 2018 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium).

[8]  Wen-Qin Wang,et al.  Range-Angle-Dependent Beamforming by Frequency Diverse Array Antenna , 2012 .

[9]  Michael P Daly,et al.  Beamsteering in Pattern Reconfigurable Arrays Using Directional Modulation , 2010, IEEE Transactions on Antennas and Propagation.

[10]  Nitin H. Vaidya,et al.  Geocasting in mobile ad hoc networks: location-based multicast algorithms , 1999, Proceedings WMCSA'99. Second IEEE Workshop on Mobile Computing Systems and Applications.

[11]  Yimin Liu,et al.  The Random Frequency Diverse Array: A New Antenna Structure for Uncoupled Direction-Range Indication in Active Sensing , 2016, IEEE Journal of Selected Topics in Signal Processing.