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Mobile
Telecommunication Systems
Future mobile telecommunication systems should provide a user with
any number of high quality telecommunication services, anytime,
anywhere.Currently the main obstacle is insufficient throughput of
existing and developed wireless communication systems. This refers to
both 3rd generation communication systems and to WiMAX technology, which
is regarded as the most promising candidate for building communication
systems of the 4th generation.
WiMAX Challenges:
The main benefits of WiMAX technology are:
- The highest channel throughput of all known wireless
communication technologies due to applying OFDMA technology and 2nQAM
adaptive modulation;
- A high robustness to multipath signal propagation through OFDM
technology application.
However, the significance of these advantages is reduced in real
communication systems. For example, due to interference caused by
signals from other users when using WiMAX technology (unlike the CDMA
technology used in 3rd generation communication systems), a user can
employ only a part of a frequency resource allocated for a communication
system. Moreover, Rake-receivers, used in CDMA technology, provide an
efficient reception in a multipath channel, comparable with that of OFDM
technology. As a result, the throughput of a communication system as a
whole using the WiMAX technology is not much higher than the 3rd
generation communication system using the CDMA technology.
A common disadvantage of all previously known technologies and wireless
communication systems is a low localization of signal power during its
transmission towards a user. This leads to a high level of intrasystem
interference and, hence, insufficiently high throughput of a
communication system.
New Capabilities:
The telecommunication technologies have been rapidly developing in
recent years in the following directions:
- On the one hand, earlier technologies have been improved taking
into account the market needs (GSM towards GPRS, EDGE, and CDMA towards
cdma2000, WCDMA)
- On the other hand, wireless access technologies such as Wi-Fi and
WiMAX have greatly developed.
In both cases the main efforts were focused on improving modulation and
coding techniques to maximize channel throughput, rather than a
communication system as a whole. Therefore, the obtained solutions are
far from potential ones. In other words, there is potential in enhancing
wireless communication systems the implementation of which will allow
improving their quality and throughput significantly.
These capabilities may be realized through combining two new
technologies:
• Technologies of localizing transmitted signal power around the receive
antenna;
• New modulation and coding techniques, maximizing the throughput of a
communication system in general.
The expected total effect from applying these technologies is an
increase of throughput of a communication system in 5-10 times as
compared to the application of WiMAX technology.
Commercial Results
The fulfillment of the project will allow the following:
-Put a new mobile communication technology on the market
approximately at the same time as a mobile commercial WiMAX is expected
on the market, which would, however, provide much higher performance
than WiMAX technology.
-Communication system throughput will be significantly increased,
thus, the multimedia capabilities of wireless networks will come close
to those of wireline data transmission networks.
-Signal's spectral efficiency will be essentially improved, which
is especially important in conditions of a lack of frequency spectrum.
-Wireless service providers costs for one user will be cut down.
-Average power of subscriber terminal transmitters will be
decreased, which will extend batteries’ lifetime and will help reducing
the size, weight and cost of subscriber terminals.
-The fulfillment of the project will help attract new customers,
which have been employing wireline networks, to using wireless data
transmission networks.
