Low complexity iterative detection for OFDMA uplink with frequency offsets
IEEE Transactions on Wireless Communications
Low-complexity equalization of OFDM in doubly selective channels
IEEE Transactions on Signal Processing
Iterative detection and frequency synchronization for OFDMA uplink transmissions
IEEE Transactions on Wireless Communications
The future generations of mobile communications based on broadband access technologies
IEEE Communications Magazine
The wireless broadband (wibro) system for broadband wireless internet services
IEEE Communications Magazine
Channel-independent synchronization of orthogonal frequency division multiple access systems
IEEE Journal on Selected Areas in Communications
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In this work, we propose an iterative algorithm for the detection of transmitted symbols at the uplink of an orthogonal frequency-division multiple access (OFDMA) system. The algorithm allows distinct frequency-offsets (FO)s from each user that cause self- and multiple-access-interference. The proposed algorithm squeezes the interference of subcarrier k into 2D +1 nearby subcarriers by preprocessing the received signal, which yields a banded structure interference matrix. This banded structure is exploited to realize a low complexity iterative soft interference-cancellation minimum mean-squared error (SICMMSE) equalizer that can be used in Turbo equalization. Simulation results show that the bit-error-rate (BER) performance of the proposed algorithm outperforms existing detection algorithms and is very much close to the zero-FO frequency domain-equalization (zero-FO-FDE) at low computational cost.