Analysis of the signal-structure-based MMSE detector for interleaved OFDMA uplink

In the uplink of OFDMA systems, carrier frequency offsets (CFOs) can be compensated directly at the receiver by several methods. Particularly, Cao and Tureli applied minimum mean square error (MMSE) criterion to recover individual ideal waveform exploiting multiuser signal structure characteristic inherent from an interleaved subcarrier assignment. In this paper, the explicit signal-to-interference power ratio (SIR) and the signal-to-interference and noise power ratio (SINR) expressions of the MMSE detector are derived. The performance of the MMSE detector is compared with that of the single use detector or the post-DFT processing receiver by numerical simulations. Simulations show that the signal structure-based MMSE detector is the best.