Abstract
Iterative receivers with minimum mean square error turbo equalization are computationally involved, as they require some form of matrix inversion. In this article, we propose a low complexity iterative receiver that implements successive interference cancelation-based MAP decoding (SIC-MAP) in doubly dispersive channels for orthogonal frequency division multiplexing systems. SIC-MAP leverages the soft feedback symbol estimates to remove the intercarrier interference from the received data. Numerical simulation results show that the proposed scheme achieves BER performance comparable to that of the equalization schemes proposed in Schniter et al. and Fang et al. but with significant computational savings. A low-complexity least squares-based iterative channel estimation scheme using soft feedback information is also proposed. This scheme is especially suitable when the number of significant channel taps is higher than the number of pilots, a phenomenon that is encountered by receivers in Single Frequency Networks (for example, DVB deployments in Europe).
Highlights
Orthogonal frequency division multiplexing (OFDM)based systems have been adopted in many of the recent wireless communication standards, such as European terrestrial broadcast systems based on DVB-H, DVB-T, and DVB-T2, and cellular wireless communication systems based on 4G
Successive interference cancelation-based MAP receiver (SIC-MAP) we present a low-complexity IR that implements successive interference cancelation, followed by maximum a posteriori probability (MAP) decoding
We evaluate Successive Interference Canceler (SIC)-MAP by comparing its performance with two other iterative schemes described in Computational complexity analysis section
Summary
Orthogonal frequency division multiplexing (OFDM)based systems have been adopted in many of the recent wireless communication standards, such as European terrestrial broadcast systems based on DVB-H, DVB-T, and DVB-T2, and cellular wireless communication systems based on 4G. Require high data rates at high carrier frequencies and at high levels of mobility. Addressing these requirements results in less intercarrier spacing and severe time-varying frequency-selective multipath fading. In DVB-H, for example, the intercarrier spacing (ICS) could be as low as approximately 1 kHz, and the expected maximum receiver Doppler frequency is of the order of 10–20% of the ICS. In such scenarios, efficient receiver design is a challenging practical problem
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