Comparison of clustered and antenna interleaving OFDM in multiple-antenna systems with amplifier nonlinearities

The transmit power requirements are one of the key issues in future wireless orthogonal frequency division multiplexing (OFDM) systems. Diversity techniques applied in OFDM systems help to reduce nonlinear effects produced by the power amplifier. In this paper, low peak to average power ratio (PAPR) techniques clustered OFDM (COFDM) and antenna interleaving OFDM (AIOFDM) applied in a wireless LAN systems are evaluated under nonlinear power amplifier. This paper shows that the bit error rate (BER) obtained using antenna interleaving OFDM is lower compared to the BER obtained applying clustered OFDM and conventional OFDM in fading channels subject to amplifier nonlinearities. The implementation of these low PAPR techniques can help to reduce the power amplifier linearity restrictions increasing the power efficiency. Power amplifier efficiency is crucial in mobile systems since it has a dominant effect on the battery charge life.