Abstract
Oversampling is commonly encountered in orthogonal frequency division multiplexing (OFDM) systems to ease various performance characteristics. In this paper, we investigate the performance and complexity of one tap zero-forcing (ZF) and minimum mean-square error (MMSE) equalizers in oversampled OFDM systems. Theoretical analysis and simulation results show that oversampling not only reduces the noise at equalizer output but also helps mitigate ill effects of spectral nulls. One tap equalizers therefore yield improved symbol-error-rate (SER) performance with the increase in oversampling rate, but at the expense of increased system bandwidth and modest complexity requirements.
Highlights
Orthogonal frequency division multiplexing (OFDM) is an attractive multicarrier modulation technique for high data rate transmission systems [1], [2], due to high spectral efficiency, immunity to impulse noise, robustness in multipath fading environments to combat inter-symbol interference (ISI) and more importantly due to its simple one tap equalization
We investigate the performance and complexity of one tap zero-forcing (ZF) and minimum mean-square error (MMSE) equalizers in oversampled orthogonal frequency division multiplexing (OFDM) systems
In [11], oversampling of the OFDM signal is suggested to approximate more accurately the peak-to-average power ratio (PAR) and several PAR reduction approaches and corresponding PAR distribution studies based on oversampled OFDM signals have appeared in the literature [12] [13] [14]
Summary
Orthogonal frequency division multiplexing (OFDM) is an attractive multicarrier modulation technique for high data rate transmission systems [1], [2], due to high spectral efficiency, immunity to impulse noise, robustness in multipath fading environments to combat inter-symbol interference (ISI) and more importantly due to its simple one tap equalization. Based on our theoretical analysis and simulation results, we conclude that oversampling is more profitable than thought as it improves the per-symbol equalization performance of ZF and MMSE OFDM receivers and makes them more resilient to channel nulls. The OFDM signals based on the system model (4) are cyclically extended, digital-t-analogue (D/A) conversion and transmit filtering are performed, the signal is modulated to some carrier frequency, power amplified and transmitted through the channel. Equals the AWGN vector n M with all entries removed from which corresponding entries of uM are zero
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