Indoor Optical Wireless MIMO System With an Imaging Receiver

Dambul, Katrina D.; O’Brien, Dominic; Faulkner, Grahame

doi:10.1109/lpt.2010.2091627

Cited by 86 publications

(62 citation statements)

References 12 publications

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“…Explicitly, Zeng et al [106] studied and compared the non-imaging and imaging MIMO techniques 5 , which provided deep insights concerning optical MIMO systems. An experimental 2 × 2 imaging-based MIMO system was reported in [107], but the illumination requirements were not given any cognisance. In addition, a MIMO system using an imaging receiver relying on a hemispherical lens was designed and analysed in [108] for improving the spatial diversity order.…”

Section: Multiuser Signal Processingmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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Abstract-In order to counteract the explosive escalation of wireless tele-traffic, the communication spectrum has been gradually expanded from the conventional radio frequency (RF) band to the optical wireless (OW) domain. By integrating the classic RF band relying on diverse radio techniques and optical bands, the next-generation heterogeneous networks (HetNets) are expected to offer a potential solution for supporting the ever-increasing wireless tele-traffic. Owing to its abundant unlicensed spectral resources, visible light communications (VLC) combined with advanced illumination constitute a competent candidate for complementing the existing RF networks. Although the advantages of VLC are multi-fold, some challenges arise when incorporating VLC into the classic RF HetNet environments, which may require new system architectures. The user-centric (UC) design principle for VLC environments constitutes a novel and competitive design paradigm for the super dense multi-tier cell combinations of HetNets. The UC concept may be expected to become one of the disruptive techniques to be used in the forthcoming fifthgeneration era. This paper provides a comprehensive survey of visible-light-aided OW systems with special emphasis on the design and optimization of VLC networks, where the radically new UC design philosophy is reviewed. Finally, design guidelines are provided for VLC systems.

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Section: Multiuser Signal Processingmentioning

confidence: 99%

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Zhang

Hanzo

2018

IEEE Commun. Surv. Tutorials

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“…A summary of the parameters and the expressions for r m and r q for each case is provided in Table IV. These parameters and expressions are use to evaluate (27), and to compute the probability of correctly decoding pulse position as follows.…”

Section: B Effect Of Timing Error On the Detection Of Pulse Positionmentioning

confidence: 99%

“…As established in previous reports on SM, the performance of SM technique is highly dependent on the dissimilarity of the channel gains of the transmit-receive paths [1], [2], [25]. However, the optical MIMO channel can be highly correlated if the locations of the transmit and receive units are not optimized [26], [27], which results in a significant penalty in error performance. By physically separating the MIMO transmit-receive paths in order to achieve channel gain dissimilarity, each path may experience slightly different propagation characteristics such as channel delay.…”

mentioning

confidence: 99%

Effect of Synchronization Error on Optical Spatial Modulation

Olanrewaju

Popoola

2017

IEEE Trans. Commun.

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Abstract-This work examines the effect of synchronisation error on the performance of spatial modulation (SM) technique in optical wireless communication (OWC) systems. SM exploits the deployment of multiple transmitters by encoding user information on their spatial domain. In most works related to SM, a perfect synchronisation among these multiple transmitters is assumed. However, synchronisation error can result from multipath propagation in OWC channel, and clock jitter and variation in propagation delay of each transmitter. Such error in synchronisation degrades system performance and hence the need to investigate its effect. Using union bound technique, and defining synchronisation errors as timing offsets in the received signals, we derive the symbol error rate for space shift keying (SSK), generalised SSK (GSSK), SM and generalised SM (GSM) schemes, and we validate our analysis with tightly-matched simulation results. Results show degradation in performance increases with synchronisation error. While SSK is tolerant for a small range of synchronisation error, GSSK, SM and GSM are significantly impaired. Our results also demonstrate the dependence of SM on channel gain values. We observe that the lower the channel gain of the transmitter in which synchronisation error occurs, the lesser the impact of the synchronisation error on the system performance.

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“…An electrical signal is converted to an opticalintensity signal via LEDs, which is known as intensity modulation (IM), and a noncoherent receiver, such as a photodetector (PD), restores the electrical signal proportionally to the received optical intensity, which is known as direct detection (DD). Considerable research has been conducted on VLC systems, such as implementation techniques [5][6][7][8], channel characteristics [9], multiple-input/multiple-output techniques [10,11], orthogonal frequency-division multiplexing (OFDM) [12][13][14][15][16][17][18][19], and schemes for dimming requirements . Dimming is a unique characteristic of VLC, which makes it different from conventional optical wireless communications (OWCs).…”

Section: Introductionmentioning

confidence: 99%

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

Yun

Lee

Ahn

et al. 2014

Journal of the Optical Society of Korea

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Visible light communications (VLC) using the intensity modulation of light-emitting diodes (LEDs) provides a new communication medium to overcome the shortage of radio spectrum, and allows reuse of LED lighting infrastructures. Orthogonal frequency-division multiplexing (OFDM) was introduced to VLC for its merits in mitigating the fading effects resulting from delay spread, and in avoiding low-frequency ambient interference. Noise and clipping are two major factors that degrade the performance of OFDM in VLC. A larger signal easily overcomes noise, but experiences impairment by clipping. Therefore, degradation due to clipping has a trade-off relationship with that due to noise, depending on the signal amplitude of OFDM. In this paper, the optimal signal amplitude in the trade-off is obtained by simulation when the dimming and LED intensity are given. The former indicates a user's requirement for lighting, and the latter represents the channel quality. The required LED intensity-to-noise ratio, as the channel quality that guarantees dimming as well as an adequate bit-error rate (BER), is also discussed.

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Indoor Optical Wireless MIMO System With an Imaging Receiver

Cited by 86 publications

References 12 publications

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Optimization of Visible-Light Optical Wireless Systems: Network-Centric Versus User-Centric Designs

Effect of Synchronization Error on Optical Spatial Modulation

Optimal Signal Amplitude of Orthogonal Frequency-Division Multiplexing Systems in Dimmable Visible Light Communications

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