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Recently, a novel direct current-biased optical filter bank multi-carrier (DCO-FBMC) scheme has been proposed for optical wireless communication (OWC) in intensity modulation and direct detection channel. Although the DCO-FBMC scheme supports fully asynchronized multi-user uplink transmission and has been proven to have higher spectral and power efficiency than direct current biased optical orthogonal...
Non-orthogonal multiple access (NOMA) has been studied in visible light communication (VLC) systems such as direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) for higher spectral efficiency. To ensure the unipolarity of optical signals, clipping is adopted and makes a difference. However, few works on the NOMA with DCO-OFDM (NOMA-DCO-OFDM) system pay attention to the...
Optical wireless communication (OWC) is position sensitive and deemed not suitable for ultra-high throughput mobile communications. In this paper, we propose an optical mobile communication (OMC) system, which dynamically allocates optical beams to mobile users and tracks the users adaptively, thus extends OWC to mobile scenarios. Principles of OMC is introduced and several key design problems are...
This paper proposes two filter bank multicarrier (FBMC) schemes for optical communication in intensity modulation direct detection (IM/DD) channel with and without direct current (DC) bias. The aim is to overcome some inherent drawbacks of the commonly used optical orthogonal frequency division multiplexing (OFDM) schemes. Key transceiver principles are designed to accommodate the requirements of...
A unipolar orthogonal frequency division multi-plexing (OFDM) technique called flipped OFDM (Flip-OFDM), is suitable for intensity modulation and direct detection (IM/DD) channel which needs the transmitted signal to be real and positive. Flip-OFDM uses two consecutive OFDM subframes to transmit the positive and negative parts of the signal, respectively. In the conventional receiver, only the difference...
This paper proposes an optimal receive algorithm for asymmetrically clipped optical OFDM (ACO-OFDM) based optical wireless communication systems with intensity modulation and direct detection (IM/DD). Conventional ACO-OFDM system only employs the information of odd subcarriers, and the information on even subcarriers is discarded. This paper presents a novel ACO-OFDM receiver, which exploits the anti-periodic...
In this paper, the optimal DC bias value of symmetric double-sided signal clipping in DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM) visible light communication (VLC) system is deduced. Double-sided clipping is necessary due to the unipolarity of the optical intensity-modulated, direct-detected (IM/DD) system and power limit of the transmitter. Symmetric double-sided clipping...
The performance of orthogonal frequency division multiplexing interleave division multiple access (OFDM-IDMA) systems would be severely degraded by the inter-carrier interference (ICI) which is caused by multiple carrier frequency offsets (CFOs). Existing receivers with CFO mitigation capabilities either have extremely high complexities or suffer from performance loss compared with the conventional...
In visible light communication (VLC) systems with intensity modulation (IM) and direct detection (DD), the modulation bandwidth of light emitting diode (LED) is limited, and dispersion of the channel might cause inter-symbol interference. Also, the transmitted signal must be nonnegative. Thus most modulation schemes for radio communications cannot be used directly for such a system. This paper develops...
The frequency offset between the transmitter and the receiver would severely impact the performance of orthogonal frequency division multiplexing (OFDM) system and must be compensated. One of effective sampling frequency synchronous algorithms was proposed by H. Shafiee; however, when this original synchronous algorithm is used to the OFDM system with a large number of sub-carriers, the existence...
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