Visible Light Communication Systems with low complexity
MIMO-OFDM VISIBLE LIGHT COMMUNICATION
SYSTEM WITH LOW COMPLEXITY
SUBJECT: MODERN SATELLITE COMMUNICATION
SUBJECT CODE: EEE 637
SUBMITTED BY,
M.TECH COMMUNICATION ENGINEERING
(2nd SEMESTER)
SCHOOL OF ELECTRONICS ENGINEERING (SENSE)
VELLORE INSTITUTE OF TECHNOLOGY
VELLORE, TAMIL NADU - 632014
ABSTRACT
Visible Light Communication (VLC) systems are being developed with the ultimate aim to create ultra-high-speed, high security, biologically friendly communications networks that allow the creation and expansion of seamless computing applications using very large bandwidth high-frequency pulsed light instead of radiowaves and microwaves. The most commonly used scheme for VLC is intensity modulation (IM) and direct detection (DD).
In VLC systems with intensity modulation (IM) and direct detection (DD), the modulation bandwidth of light emitting diode (LED) is limited, and the dispersion of the channel might cause ISI. Therefore most modulation schemes cannot be used directly for such a system. This project aims to show that a multiple-input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) VLC system overcomes the modulation bandwidth limitation of LED and satisfies the requirements of the transmitted signal for IM/DD. Two transmit data streams require only one inverse Fourier transform (IDFT) block, resulting in low computational complexity of the system. A MIMO system provides a significant improvement in capacity and data rates, compared with their single input output (SISO) counterparts, without any increase in bandwidth or transmit power. OFDM on the other hand is an effective technique when dealing with ISI.
TABLE OF CONTENTS
ABSTRACT
LIST OF FIGURES
1. INTRODUCTION
1
2. MIMO-OFDM
4
2.1. OFDM
4
2.1.1 Traditional view of Receiving signals carrying modulation
4
2.1.2 OFDM Spectrum
5
2.1.3 Advantages of OFDM
5
2.1.4 OFDM Transmission Scheme
5
2.2 MIMO
8
SYSTEM WITH LOW COMPLEXITY
SUBJECT: MODERN SATELLITE COMMUNICATION
SUBJECT CODE: EEE 637
SUBMITTED BY,
M.TECH COMMUNICATION ENGINEERING
(2nd SEMESTER)
SCHOOL OF ELECTRONICS ENGINEERING (SENSE)
VELLORE INSTITUTE OF TECHNOLOGY
VELLORE, TAMIL NADU - 632014
ABSTRACT
Visible Light Communication (VLC) systems are being developed with the ultimate aim to create ultra-high-speed, high security, biologically friendly communications networks that allow the creation and expansion of seamless computing applications using very large bandwidth high-frequency pulsed light instead of radiowaves and microwaves. The most commonly used scheme for VLC is intensity modulation (IM) and direct detection (DD).
In VLC systems with intensity modulation (IM) and direct detection (DD), the modulation bandwidth of light emitting diode (LED) is limited, and the dispersion of the channel might cause ISI. Therefore most modulation schemes cannot be used directly for such a system. This project aims to show that a multiple-input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) VLC system overcomes the modulation bandwidth limitation of LED and satisfies the requirements of the transmitted signal for IM/DD. Two transmit data streams require only one inverse Fourier transform (IDFT) block, resulting in low computational complexity of the system. A MIMO system provides a significant improvement in capacity and data rates, compared with their single input output (SISO) counterparts, without any increase in bandwidth or transmit power. OFDM on the other hand is an effective technique when dealing with ISI.
TABLE OF CONTENTS
ABSTRACT
LIST OF FIGURES
1. INTRODUCTION
1
2. MIMO-OFDM
4
2.1. OFDM
4
2.1.1 Traditional view of Receiving signals carrying modulation
4
2.1.2 OFDM Spectrum
5
2.1.3 Advantages of OFDM
5
2.1.4 OFDM Transmission Scheme
5
2.2 MIMO
8
References: [2]. Yong Soo Cho, Jaekwon Kim, Won Young Yang, Chung Gu Kang, MIMO-OFDM Wireless Communications with MATLAB, pp 111-150, 281-307, 2010.