Space division multiple access for wireless local area networks
Space division multiple access for wireless local area networks
Constrained least squares detector for OFDM/SDMA-based wireless networks
IEEE Transactions on Wireless Communications
Comparison of two modulation techniques using frequency domain processing for in-house networks
IEEE Transactions on Consumer Electronics
Frequency domain equalization for single-carrier broadband wireless systems
IEEE Communications Magazine
Broadband wireless access solutions based on OFDM access in IEEE 802.16
IEEE Communications Magazine
EURASIP Journal on Advances in Signal Processing
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There is an ongoing discussion in the broadband wireless world about the respective benefits of orthogonal frequency division multiplexing (OFDM) and single carrier with frequency domain equalization (SC-FD). SC-FD allows for more relaxed front-end requirements, of which the power amplifier efficiency is very important for battery-driven terminals. OFDM, on the other hand, can yield improved BER performance at low complexity. Both schemes have extensions to multiple antennas to enhance the spectral efficiency and/or the link reliability. Moreover, both schemes have nonlinear versions using decision feedback equalization (DFE) to further improve performance of the linear equalizers. In this paper, we compare these high-performance OFDM and SC-FD schemes using multiple antennas and DFE, while also accounting for the power amplifier efficiency. To make a realistic comparison, we also consider most important digital imperfections, such as channel and noise estimation, transmit and receive filtering, clipping and quantization, as well as link layer impact. Our analysis shows that for frequency-selective channels the relative performance impact of the power amplifier is negligible compared to the frequency diversity impact. The higher frequency diversity exploitation of SC-FD allows it to outperform OFDM in most cases. Therefore, SC-FD is a suitable candidate for broad-band wireless communication.