Mobile Multigigabit Indoor Optical Wireless Systems Employing Multibeam Power Adaptation and Imaging Diversity Receivers

Fuad E. Alsaadi; Jaafar M.H. Elmirghani

doi:10.1364/JOCN.3.000027

Journal of Optical Communications and Networking
Vol. 3,
Issue 1,
pp. 27-39
(2011)
•https://doi.org/10.1364/JOCN.3.000027

Mobile Multigigabit Indoor Optical Wireless Systems Employing Multibeam Power Adaptation and Imaging Diversity Receivers

Fuad E. Alsaadi and Jaafar M.H. Elmirghani

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Fuad E. Alsaadi and Jaafar M.H. Elmirghani, "Mobile Multigigabit Indoor Optical Wireless Systems Employing Multibeam Power Adaptation and Imaging Diversity Receivers," J. Opt. Commun. Netw. 3, 27-39 (2011)

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Abstract

In this paper, we introduce two novel methods (beam power adaptation and diversity imaging) to the design of optical wireless systems to improve link performance. The aim is to reduce the effect of intersymbol interference and to enhance the signal-to-noise ratio (SNR), thus enabling the system to achieve mobility while operating at high bit rates. In good agreement with previous work, the results show that the imaging conventional diffuse system (CDS) with maximum ratio combining (MRC) offers 20 dB better SNR than the nonimaging CDS. The new adaptive line strip multibeam system (ALSMS) with a new imaging diversity receiver provides an SNR improvement of 39 dB over the imaging diversity CDS when both systems employ MRC and operate at $30 Mbits ∕ s$ . This result illustrates the SNR improvement achieved through the use of our adaptive algorithm coupled with spot diffusing. The lower bit rate $(30 Mbits ∕ s)$ facilitates comparison with previous work. The results also indicate that the combination of transmit power adaptation and spot diffusing coupled with imaging diversity receivers can enable fully mobile $2.5 Gbit ∕ s$ optical wireless communication. Such a $2.5 Gbit ∕ s$ system (imaging MRC ALSMS) achieved an SNR improvement of $27 dB$ over a lower data rate $(30 Mbits ∕ s)$ nonimaging CDS.

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Parameter	Configuration Uplink Transmission
Room
Length		$8 m$
Width		$4 m$
Height		$3 m$
$ρ_x_z$ Wall		0.8
$ρ_y_z$ Wall		0.8
$ρ_x_z$ op. Wall		0.8
$ρ_y_z$ op. Wall		0.8
ρ_Floor		0.3
Transmitter
Number of transmitters		1
Locations (x, y, z)	(2,4,1)	(1,1,1)	(2,7,1)
Elevation	90°	90°	90°
Azimuth	0°	0°	0°
Diversity Receiver
Number of branches		3
Photodetector’s area	$2 {cm}^{2}$	$0.44 {cm}^{2}$	$0.44 {cm}^{2}$
Acceptance semi-angle	65°	25°	25°
Locations (x, y, z)	(1,1,1), (1,2,1), (1,3,1), (1,4,1), (1,5,1), (1,6,1), (1,7,1) (2,1,1), (2,2,1), (2,3,1), (2,4,1), (2,5,1), (2,6,1), (2,7,1)
Elevation	90°	20°	20°
Azimuth	0°	90°	270°
Pixels
Number of pixels	200	100	100
Pixel’s area	$1 {mm}^{2}$	$0.44 {mm}^{2}$	$0.44 {mm}^{2}$
Time bin duration	$0.3 ns$	$0.3 ns$	$0.3 ns$
Bounces	1		2
Number of elements	32,000		2000
$d A$	$5 cm \times 5 cm$		$20 cm \times 20 cm$
Spot lamps
Number of spot lamps		8
Locations (x, y, z)	(1,1,3), (1,3,3), (1,5,3), (1,7,3)(3,1,3), (3,3,3), (3,5,3), (3,7,3)
Wavelength		$850 nm$
Receiver Bandwidth	$30 MHz$		$2.5 GHz$
Bit rate	$30 Mbits ∕ s$		$2.5 Gbits ∕ s$

Configuration	$3 dB$ Channel Bandwidth (GHz)
	Y (m)
	1	2	3	4	5	6	7
CDS with a single nonimaging receiver $(FOV = 130 °)$	0.064	0.084	0.071	0.067	0.068	0.056	0.041
CDS with a single imaging receiver-SB	0.31	0.3	0.29	0.2	0.19	0.18	0.16
LSMS with a single imaging receiver-SB	0.83	0.75	0.62	0.46	0.34	0.22	0.19
ALSMS with a single imaging receiver-SB	7.61	7.58	7.57	7.56	7.54	7.51	7.5

Parameter	Configuration Uplink Transmission
Room
Length		$8 m$
Width		$4 m$
Height		$3 m$
$ρ_x_z$ Wall		0.8
$ρ_y_z$ Wall		0.8
$ρ_x_z$ op. Wall		0.8
$ρ_y_z$ op. Wall		0.8
ρ_Floor		0.3
Transmitter
Number of transmitters		1
Locations (x, y, z)	(2,4,1)	(1,1,1)	(2,7,1)
Elevation	90°	90°	90°
Azimuth	0°	0°	0°
Diversity Receiver
Number of branches		3
Photodetector’s area	$2 {cm}^{2}$	$0.44 {cm}^{2}$	$0.44 {cm}^{2}$
Acceptance semi-angle	65°	25°	25°
Locations (x, y, z)	(1,1,1), (1,2,1), (1,3,1), (1,4,1), (1,5,1), (1,6,1), (1,7,1) (2,1,1), (2,2,1), (2,3,1), (2,4,1), (2,5,1), (2,6,1), (2,7,1)
Elevation	90°	20°	20°
Azimuth	0°	90°	270°
Pixels
Number of pixels	200	100	100
Pixel’s area	$1 {mm}^{2}$	$0.44 {mm}^{2}$	$0.44 {mm}^{2}$
Time bin duration	$0.3 ns$	$0.3 ns$	$0.3 ns$
Bounces	1		2
Number of elements	32,000		2000
$d A$	$5 cm \times 5 cm$		$20 cm \times 20 cm$
Spot lamps
Number of spot lamps		8
Locations (x, y, z)	(1,1,3), (1,3,3), (1,5,3), (1,7,3)(3,1,3), (3,3,3), (3,5,3), (3,7,3)
Wavelength		$850 nm$
Receiver Bandwidth	$30 MHz$		$2.5 GHz$
Bit rate	$30 Mbits ∕ s$		$2.5 Gbits ∕ s$

Configuration	$3 dB$ Channel Bandwidth (GHz)
	Y (m)
	1	2	3	4	5	6	7
CDS with a single nonimaging receiver $(FOV = 130 °)$	0.064	0.084	0.071	0.067	0.068	0.056	0.041
CDS with a single imaging receiver-SB	0.31	0.3	0.29	0.2	0.19	0.18	0.16
LSMS with a single imaging receiver-SB	0.83	0.75	0.62	0.46	0.34	0.22	0.19
ALSMS with a single imaging receiver-SB	7.61	7.58	7.57	7.56	7.54	7.51	7.5

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Equations (18)

Journal of Optical Communications and Networking