KEYWORDS: Orthogonal frequency division multiplexing, Modulation, Receivers, Radio over Fiber, Transmitters, Systems modeling, Telecommunications, Wireless communications, MATLAB, Modulators
Orthogonal Frequency Division Multiplex (OFDM) is a modulation technique to transmit the baseband Radio signals
over Fiber (RoF). Combining OFDM modulation technique and radio over fiber technology will improve future wireless
communication. This technique can be implemented using laser and photodetector as optical modulator and
demodulator. OFDM uses multiple sub-carriers to transmit low data rate streams in parallel, by using Quadrature
Amplitude Modulation (QAM) or Phase Shift Keying (PSK). In this paper we will compare power spectrum signal and
signal constellation of transmitted and received signals in RoF using Matlab and OptiSystem simulation software.
KEYWORDS: Antennas, Telecommunications, Receivers, Transmitters, Signal to noise ratio, Orthogonal frequency division multiplexing, Signal detection, Wireless communications, Mobile communications, Data communications
By increasing multimedia communications, mobile communications are expected to reliably support high data rate
transmissions. To provide higher peak rate at a better system efficiency, which is necessary to support broadband data
services over Wireless links, we need to employ long term evolution Advanced (LTE-A) Multiple-input multiple-output
MIMO uplink. The outline of this paper is to investigate and discuss the Long Term Evolution (LTE) for broadband
wireless technologies and to discuss its functionality. We explore how LTE uses the inter-technology mobility to support
a variety of access technology.
This paper investigates the channel capacity and bit error rate of MIMO-OFDM system. In addition, it introduces various
MIMO technologies employed in LTE and provide a brief overview on the MIMO technologies currently discussed in
the LTE-Advanced forum.
KEYWORDS: Orthogonal frequency division multiplexing, Radio over Fiber, Modulation, Telecommunications, Complex systems, Data communications, Distortion, Wireless communications, Video, Radio optics
The radio-over-fiber (RoF) network has been a proven technology to be the best candidate for the wireless-access
technology, and the orthogonal frequency division multiplexing (OFDM) technique has been established as the core
technology in the physical layer of next generation wireless communication system, as a result OFDM-RoF has drawn
attentions worldwide and raised many new research topics recently.
At the present time, the trend of information industry is towards mobile, wireless, digital and broadband. The next
generation network (NGN) has motivated researchers to study higher-speed wider-band multimedia communication to
transmit (voice, data, and all sorts of media such as video) at a higher speed. The NGN would offer services that would
necessitate broadband networks with bandwidth higher than 2Mbit/s per radio channel. Many new services emerged,
such as Internet Protocol TV (IPTV), High Definition TV (HDTV), mobile multimedia and video stream media. Both
speed and capacity have been the key objectives in transmission. In the meantime, the demand for transmission
bandwidth increased at a very quick pace. The coming of 4G and 5G era will provide faster data transmission and higher
bit rate and bandwidth.
Taking advantages of both optical communication and wireless communication, OFDM Radio over Fiber (OFDM-RoF)
system is characterized by its high speed, large capacity and high spectral efficiency. However, up to the present there
are some problems to be solved, such as dispersion and nonlinearity effects. In this paper we will study the dispersion
and nonlinearity effects and their elimination in OFDM-radio-over-fiber system.
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