Management Komunikasi by nep99710


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									            Radio Resource Management untuk Sistem Komunikasi
                          Ultra Wide Band (UWB)
Staff           : Muhammad Asvial
Students        :-
Sponsors        : RUUI 2007
Email contact   :

The emerging Ultra Wide Band (UWB) communication system offers a great potential for a design
of high speed short range wireless communications which fully support high data streaming
capacity. This can be achieved by exploiting both spatial and multipath diversity using of MIMO
OFDM system and proper coding techniques. The systems combine MIMO antenna and OFDM
technique which reliable in high data rate transmission even in multipath environment. It also
overcomes delay spread distortion and unflat fading caused by multipath channels. Multipath
signal propagation has long been thought as an impairment limiting the system capacity and
reliable communication in wireless channels, together with the constraint of power and bandwidth.
In MIMO-OFDM for UWB communication system, this multipath propagation due the rich
scattering in wireless channels is used to improve achieavable data rate and link quality. As the
number of antennas at both the ends is increasing, the capacity is increases linearly with the
minimum of the number of transmit and receive antennas for a given fixed signal to noise ration
(SNR), even if the fades between antenna pairs are correlated. In particular, the analytical
expression has been derived for the ergodic capacity in independent and identically distributed
Rayleight flat fading MIMO channels in integral form involving the Laguerre polynomials by
numericlly evaluating the integrals to find the ergodic capacity for different numbers of transmit
and receive antennas in MIMO-OFDM environment. In this research, radio resource
management, including system simulation and MIMO-OFDM channel modeling for UWB
communication system is proposed by applying the concept of decomposition of frequency
selective fading channel into parallel flat fading channel in the frequency domain. This frequency
domain channel model is used to present the performance for different data rates. The concept of
decoupling of frequency selective channel into spatial domain by presenting SVD based
approach is developed to decouple flat fading MIMO channels to orthogonal spatial channels.
The SVD based spatial domain decoupling is combined with FFT based frequency domain
decoupling to obtain UWB MIMO OFDM parallel channel model. The simulation and theoretical
analysis can be implemented in high speed short range UWB communication systems by
applying a rate selection technique base on channel condition. The channel capacity and BER
are evaluated for different SNR with and without CSI environments. The results show that the
system capacity and BER of MIMO-OFDM for UWB communication system can be achieved by
increasing signal to noise ratio.

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