Real-Time 500 Mbit Sample Clauses

Real-Time 500 Mbit s Bidirectional VLC Prototype Besides the high-speed, off-line processed laboratory achievements, the maturity of VLC technology for all the potential applications has to be proven with real-time systems, an effort onto which we focused recently. The very first fully-fledged VLC real-time demonstration was presented in February 2011 at ORANGE labs facilities by the consortium of the EU-project OMEGA (xxx.xxx-xxxxx.xx). This system provided 100 Mb/s net data rate. OFDM-based modulation and demodulation, forward error correction, synchronization and a specifically developed Media Access Control (MAC) were implemented on FPGAs. In an area of about 10 m2, equipped with 16 LED lamps distributed at the ceiling, four HD-videos were broadcasted simultaneously to four different laptops [51]. 1000BASE-T Ethernet OFDM Transceiver Visible Light LED Photodiode Optical Channel Visible Light LED Photodiode 1000BASE-T Ethernet OFDM Transceiver Tabletop LED-Luminaire LED Current Driver TIA LED Current Driver TIA Figure 29: The overall bidirectional real-time line-of-sight (LOS) VLC link. In order to advance the VLC technology towards future commercial applications, more recently, we developed a bidirectional high-speed real-time VLC system. The idea is presented schematically in Figure 29. Data transmission is based on an optimized, rate-adaptive OFDM modulation and demodulation scheme. The transceivers are equipped with specially designed VLC transmitter and receiver modules. Due to the fact that the VLC channel is based on intensity modulation and direct detection, a real-valued positive waveform is used. Here, DC-biased DMT is applied to obtain a unipolar (positive valued) time domain signal at the transmitter, while potentially remaining negative signal amplitudes are clipped at the expense of an increased error rate. Therefore, the DC-bias and the modulation index need to be chosen carefully at the LED driver. The VLC transmitter is primarily composed of a new LED current driver and an off-the- shelf high-power visible-light LED. The VLC receiver comprises a transimpedance amplifier (TIA) and a commercially available high-speed Si-PIN-photodiode. Our new modules increase the modulation bandwidth from 30 to 180 MHz. The new transceiver modules have a relatively small form factor (cf. Figure 30), can operate without active cooling and are easily useable. Each transceiver is equipped with an external power supply and 1000BASE-T Ethernet interfaces using standard RJ45 con...
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