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|Title: ||IDMA-OFDM schemes for wireless communication systems|
|Authors: ||Liu, Ye|
|Department: ||Department of Electronic Engineering|
|Issue Date: ||2009|
|Supervisor: ||Supervisor: Prof. Li, Ping., Assessor: Dr. Sung, Albert C W|
|Abstract: ||Orthogonal Frequency Division Multiplexing (OFDM) is a very efficient way of
realizing multicarrier modulation. It provides high spectral efficiency thanks to the
orthogonality among subcarriers. What’s more, Inter-symbol Interference (ISI) among users
can be eliminated by cyclic prefix, and the implementation of OFDM can be simply realized
by a pair of IFFT & FFT. However, an uncoded OFDM may not perform well in frequency
selective fading channels.
Interleave Division Multiple Access (IDMA) can be treated as a special form of CDMA.
In IDMA, random interleavers are employed for user specification. With appropriate Forward
Error Correction (FEC) coding and low cost iterative Multi-user Detection (MUD), IDMA
performs well in fading channels.
OFDM-IDMA is a recent proposed wireless communication scheme. The motivation of
such a joint-scheme is simply to combine the advantages of both OFDM and IDMA. It is
expected that OFDM-IDMA has a good performance over fading channels for multiuser
communication system. On top of this, power allocation can be applied to enhance the system
performance with different system data rates.
In this project, the following issues will be addressed:
1. Software implementation of OFDM-IDMA multiuser system with FEC and QPSK
modulation over Rayleigh fading multipath channels
2. Power allocation for supporting different system rates
3. Software implementation of uncoded OFDMA multiuser system with QPSK modulation
over Rayleigh fading multipath channels
4. Comparison between OFDM-IDMA and uncoded OFDMA over Rayleigh fading
5. Performance evaluation of OFDM-IDMA and uncoded OFDMA when considering
|Appears in Collections:||Electronic Engineering - Undergraduate Final Year Projects|
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