ABSTRACT:
The number
of subscribers for mobile communications has increased much faster than
predicted. In the year 2010, more than 1.8 billion mobile subscribers are
anticipated. The majority of traffic is changing from speech oriented
communication to multimedia communication. The major step from second
generation to third generation and further to fourth generation was the ability
to support advanced and wideband services including e-mail, file transfers and
distribution services like radio, TV and software provisioning.
In this paper
we address about the 4TH G mobile communications.
The Fourth Generation (4G) Mobile Communications
not only focuses on the data-rate increase and new air interface.4G Mobile converges
the advanced wireless mobile communications and high-speed wireless access
systems into an Open Wireless Architecture (OWA) platform which becomes the
core of this emerging next generation mobile technology. Based on this OWA
model, 4G mobile will deliver the best business cases to the wireless and mobile
industries,i.e.cdma2000/WLAN/GPRS 3-in-1 product, WCDMA/OFDM/WLAN 3-in-1
product, etc. Asia-Pacific is the most dynamic market of new generation mobile
communications with over $100 Billion businesses in the next decade.
The 4G mobile technology -convergence of
wireless mobile and wireless access, will definitely drive this growth. Any
single-architecture wireless system, including 3G, HSDPA, WiMax, etc., is a
transitional solution only, and will be replaced by open wireless architecture
system very soon where various different wireless standards can be integrated
and converged on this open platform.
The advent of 4G
wireless systems has created many research opportunities. The expectations from
4G are high in terms of data rates, spectral efficiency, mobility and
integration. Orthogonal Frequency Division Multiplexing (OFDM) is proving to be
a possible multiple access technology to be used in 4G. But OFDM comes with its
own challenges like high Peak to Average Ratio, linearity concerns and phase
noise. This paper proposes a solution to reduce Peak to Average Ratio by
clipping method. ATLAB as used to
generate the OFDM signal to prove that clipping does reduce Peak to Average
Ratio.
INTRODUCTION:
The
first operational cellular communication system was deployed in the Norway in
1981 and was followed by similar systems in the US and UK. These first
generation systems provided voice transmissions by using frequencies around 900
MHz and analogue modulation.
The
second generation (2G) of the wireless mobile network was based on low-band
digital data signaling. The most popular 2G wireless technology is known as
Global Systems for Mobile Communications (GSM). The first GSM systems used a
25MHz frequency spectrum in the 900MHz band.
Planning for 3G
started in the 1980s. Initial plans focused on multimedia applications such as
videoconferencing for mobile phones. When it became clear that the real killer
application was the Internet, 3G thinking had to evolve. As personal wireless
handsets become more common than fixed telephones, it is clear that personal
wireless Internet access will follow and users will want broadband Internet
access wherever they go.
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