RADON TRANSFORM BASED OFDM-IDMA SYSTEM WITH AWGN CHANNEL (original) (raw)
This paper presents a model which is Finite Radon Transform based Orthogonal Frequency Division Multiplexing-Interleaver Division Multiple Access (OFDM-IDMA) system for next generation wireless communication system. FRAT is the underlying fundamental concept used for computerized tomography scanning, as well for a wide range of other disciplines, including radar imaging, Geophysical imaging, nondestructive testing and medical imaging. Recently Finite Radon Transform (FRAT) was proposed as a mapping technique in OFDM system Conventional OFDM/QAM systems are robust for multi-path channels due to the cyclically prefixed guard interval which is inserted between consequent symbols to Remove ISI. An interleaver-based multiple access schemes have also been studied in for high spectral efficiency, improved performance and low receiver complexity. This scheme relies on interleaving as the only means to distinguish the signals from different users, and hence it has been called interleave-division multiple-access (IDMA). From the simulation results the FRAT-OFDM-IDMA system performs better as compared to DFT-OFDM-IDMA and DWT-OFDM-IDMA system in term of BER performance for next generation wireless communication system. OFDM is a digital modulation scheme in which a wideband signal is split into a number of narrowband signals. Because the symbol duration of a narrowband signal will be large than that of a wideband signal, the amount of time dispersion caused by multipath delay spread is reduced.
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ISRN Communications and Networking, 2012
Due to its good orthogonality, slantlet transform (SLT) is used in orthogonal frequency division multiplexing (OFDM) systems to reduce intersymbol interference (ISI) and intercarrier interference (ICI). This eliminates the need for cyclic prefix (CP) and increases the spectral efficiency of the design. Finite Radon transform (FRAT) mapper has the ability to increase orthogonality of subcarriers, is nonsensitive to channel parameters variations, and has a small constellation energy compared with conventional fast-Fourier-transform- (FFT-) based OFDM. It is also able to work as a good interleaver, which significantly reduces the bit error rate (BER). In this paper both FRAT mapping technique and SLT modulator are implemented in a new design of an OFDM system. The new structure was tested and compared with conventional FFT-based OFDM, Radon transform-based OFDM, and SLT-based OFDM for additive white Gaussian noise (AWGN) channel, flat fading channel (FFC), and multipath selective fadin...
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