Impact of linear misalignment on a spatial OFDM based pixelated system

Mondal, M. Rubaiyat Hossain; Armstrong, Jean

doi:10.1109/apcc.2012.6388269

Cited by 14 publications

(23 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is similar to the case of standalone LFM described in [22]. The term q l 1 ,l 2 can be written in the following format using the vignetting function, cos 4 Â l 1 ,l 2 [7], and h u,v as shown in Appendix:…”

Section: Analysis Of the Joint Impairmentsmentioning

confidence: 99%

“…Note that (22) effectively describes the effect of defocus on signal s 00 l 1 ,l 2 , and thus is similar to (8). Applying a 2-D FFT to (22) gives…”

Section: Analysis Of the Joint Impairmentsmentioning

confidence: 99%

“…Note that (24) represents the effect of LFM as reported in [22]. Thus, applying a 2-D FFT to (24) gives [22]:…”

Section: Analysis Of the Joint Impairmentsmentioning

confidence: 99%

See 2 more Smart Citations

Performance analysis of spatial OFDM for pixelated optical wireless systems

Mondal

Panta

2015

Trans. Emerging Tel. Tech.

Self Cite

View full text Add to dashboard Cite

Pixelated optical wireless systems can transmit at high speed by encoding data in transmitted images using spatial orthogonal frequency division multiplexing (spatial OFDM) but are susceptible to a number of limiting factors including defocus, linear fractional misalignment (LFM) and vignetting. This paper investigates the effects of these impairments on the performance of both forms of spatial OFDM: spatial DC-biased optical OFDM (SDCO-OFDM) and spatial asymmetrically clipped optical OFDM (SACO-OFDM). The novelty of this paper is in the theoretical analysis of the effect of defocus on a spatial OFDM based pixelated system. The theoretical results for defocus are found to be in agreement with the simulation results reported in the literature. Furthermore, the joint effects of defocus, LFM and vignetting are mathematically described. Analytical and simulation results show that these three factors are largely independent of each other. Simulation results indicate that these impairments and their associated mitigation techniques influence the optimum choice of DC bias for SDCO-OFDM. Finally, it is shown that for the case of the joint impairments and for a given data rate, the bit error rate performance of SDCO-OFDM with the optimum bias is slightly better than that of SACO-OFDM. ], which is an extension of the concept of conventional OFDM [18][19][20] to the 2-D spatial domain. For spatial OFDM, data are encoded in the spatial-frequency domain, the frequency representation of the 2-D image space, using a number of orthogonal 2-D subcarriers. Each of the encoded spatial frames is converted to a pixelated image before transmission. Spatial OFDM has several advantages for pixelated communication. Compared with systems that encode data directly in the spatial domain, a spatial OFDM scheme is less affected by a number of distortions occurring in the spatial domain [7,8,21,22]. Moreover, the formation of the data-carrying transmitted images can be well-designed. This means that, by using spatial OFDM algorithms at the transmitter side, the images can be generated in a way that makes them much robust to distortions. The receiver can then decode the

show abstract

Section: Analysis Of the Joint Impairmentsmentioning

confidence: 99%

“…Note that (22) effectively describes the effect of defocus on signal s 00 l 1 ,l 2 , and thus is similar to (8). Applying a 2-D FFT to (22) gives…”

Section: Analysis Of the Joint Impairmentsmentioning

confidence: 99%

See 1 more Smart Citation

Performance analysis of spatial OFDM for pixelated optical wireless systems

Mondal

Panta

2015

Trans. Emerging Tel. Tech.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Methods of Visible-Light Communication (VLC) have been developed where standard cameras detect patterns intentionally placed within images. These patterns can be fixed as in QR-codes [14], dynamic as in Visual MIMO, [4,27] or LED-to-LED applications [22], and coded using OFDM as in Pixnet [17,21]. The main theme in these Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Phase messaging method for time-of-flight cameras

Yuan

Howard

Dana

et al. 2014

2014 IEEE International Conference on Computational Photography (ICCP)

View full text Add to dashboard Cite

Ubiquitous light emitting devices and low-cost commercial digital cameras facilitate optical wireless communication system such as visual MIMO where handheld cameras communicate with electronic displays. While intensity-based optical communications are more prevalent in camera-display messaging, we present a novel method that uses modulated light phase for messaging and timeof-flight (ToF) cameras for receivers. With intensity-based methods, light signals can be degraded by reflections and ambient illumination. By comparison, communication using ToF cameras is more robust against challenging lighting conditions. Additionally, the concept of phase messaging can be combined with intensity messaging for a significant data rate advantage. In this work, we design and construct a phase messaging array (PMA), which is the first of its kind, to communicate to a ToF depth camera by manipulating the phase of the depth camera's infrared light signal. The array enables message variation spatially using a plane of infrared light emitting diodes and temporally by varying the induced phase shift. In this manner, the phase messaging array acts as the transmitter by electronically controlling the light signal phase. The ToF camera acts as the receiver by observing and recording a time-varying depth. We show a complete implementation of a 3 ⇥ 3 prototype array with custom hardware and demonstrating average bit accuracy as high as 97.8%. The prototype data rate with this approach is 1 Kbps that can be extended to approximately 10 Mbps.

show abstract

“…In consideration of this issue, any method that is instructed should efficiently use the available bandwidth as motion distortions. Previous studies have demonstrated the feasibility of a well known systems and have addressed the effects of single distortions like linear misalignment [9], defocus blur [10] and vignetting [11] on the modulation methods under inquiry, notwithstanding they have not provided a comparative assessment of these systems in a controlled environment. Moreover, no comparisons were made in case of LCD camera motions which greatly affect the performance of the course of action in applications that convolute handheld camera-phone receivers.…”

Section: International Journal For Research In Applied Science and Engimentioning

confidence: 99%

DPSK-OFDM System for Reliable Data Transmission using QRcode System in Mobile Devices

Chandana¹

2017

IJRASET

View full text Add to dashboard Cite

The work of 2-D barcodes is of great relevance for evaluate in wireless data transmission between handheld electronic devices. In a typical setup, any file on a mobile phone, for concrete illustration, can be transferred to a second mobile phone over a sequence of images on the LCD which are before captured and decoded on the camera of the second mobile phone. In this study, a new approach for data modulation in 2-D barcodes is confirmed, and its attitude is evaluated in allegory to contrasting standard methods of barcode modulation. In this new approach, orthogonal frequency-division multiplexing (OFDM) modulation is used together by all of differential phase shift keying (DPSK) over adjacent frequency domain elements. A specific desire of this study is to establish a system that is proven tolerant to camera movements, picture blur, and light leakage within adjoining pixels of an LCD. Keywords: Barcode, data transfer, differential phase shift keying, orthogonal frequency-division multiplexing (OFDM) modulation, quadrature phase shift keying I. INTRODUCTIONBarcodes have played a abundant role in facilitating numerous identification processes since their invention in 1952. In fact barcode is a easily done and cost-effective approach of storing machine readable digital data on paper or product packages. As pressing needs to hand over even greater data faster and mutually high reliability have emerged, there have been large amount improvements that were made on the original barcode design. Invention of two dimensional (2D) or matrix barcodes opened a new front for these cost-effective codes and their investigation in more complex data transfer scenarios like storing contact information, URLs plus, in which QR codes have become increasingly popular.

show abstract

Impact of linear misalignment on a spatial OFDM based pixelated system

Cited by 14 publications

References 11 publications

Performance analysis of spatial OFDM for pixelated optical wireless systems

Performance analysis of spatial OFDM for pixelated optical wireless systems

Phase messaging method for time-of-flight cameras

DPSK-OFDM System for Reliable Data Transmission using QRcode System in Mobile Devices

Contact Info

Product

Resources

About