Dynamic FOV visible light communications receiver for dense optical networks

Abstract

This paper explores how the Field of View (FOV) of a Visible Light Communications (VLC) receiver can be manipulated to realize the best Signal to Noise Ratio (SNR) while supporting device mobility and optimal access point (AP) selection. We propose a Dynamic FOV receiver (D-FOV) that changes its aperture according to receiver velocity, location, and device orientation. The D-FOV technique is evaluated through modeling, analysis, and experimentation in an indoor environment comprised of 15 VLC access points (APs). The proposed approach is also realized as an algorithm that is studied through analysis and simulation. Results of the study indicate the efficacy of the approach including a 3X increase in predicted SNR over static FOV approaches based on measured Received Signal Strength (RSS) in the testbed. Additionally, the collected data reveal that D-FOV increases effectiveness in the presence of noise. Finally, we describe the tradeoffs among the number of VLC sources, FOV, user device velocity, and SNR as a performance metric.

Interference Mitigation Using Angular Diversity Receiver With Efficient Channel Estimation in MIMO VLC

“…The existing ADRs use the received value to adjust the FOV angle of their PDs. This could be practically realized using mechanical iris, liquid crystal micro-lenses, micro-electronic-mechanical systems (MEMS) and adaptive optics [28]- [32].…”

“…Clearly, for CFOV-ADR without CCI management, the detected signal on each PD is the one with highest received SINR while the other signals are considered as interfered signals. The SINR in this case is calculated from (28) as shown at the bottom of this page [39], where D j is the desired LED for which the SINR at PD i is calculated. Obviously, all received NLOS signals are considered as interfered signals as they arrive with different delays from decoded LOS signals.…”

Interference in multi-user optical wireless communications systems

“…This class consists of the techniques that allow an AP or set of APs to distribute defined resources across a set of users. It is divided into two further categories: [18,73,74] Differential detection (DD) [75] Spatial light modulators (SLM) [67] Orthogonal multiplexing (WDM) [53][54][55] AP placement and configuration [43][44][45][46] Beam control and steering [32,[47][48][49][50][51][52]68] Multiple access techniques (TDMA, OFDMA, CDMA) [19][20][21] Precoding (ZF, MMSE) for MU-MISO NOMA [29][30][31][33][34][35][36][37][38][39][40][41][42] [ [22][23][24][25][26][27][28] MA-SP MA-PHY spatial diversity multiple access -Spatial diversity. This class encompasses both of the PHY and SP cases and is concerned with receiving data by many spatially unique channels or multiple PDs then performing signal processing to have them de-correlated.…”

Interference Mitigation Through User Association and Receiver Field of View Optimization in a Multi-User Indoor Hybrid RF/VLC Illuminance-Constrained Network

“…We show: (1) The impact of orientation and FOV on signal reception validated with experimental data [18], [20]. (2) A novel dynamic FOV receiver with performance prediction and experimental validation [16] and its extension to dynamic tracking (steering to point the receiver to the center of a transmitter) [17]. And (3) Resource reuse, coverage perspectives and interference mitigation using dynamic FOV receivers [19].…”

“…We discuss interference mitigation in indoor optical wireless networks in [15]. We also study dynamic receiver FOV performance and advantages in prior work [16]- [20] and provide important insights to its usages theoretically and through experimentation.…”