Peak restoration in ofdm receiver with clipping a/d converter
IEEE Transactions on Wireless Communications
OFDM signals suffer from a large Peak to Average Power Ratio, which requires large power back-offs in the transmit and receive chains. This paper studies two digital postprocessing methods of different complexity that mitigate clipping by the analog-to-digital converter in the receiver. Clipped peaks cause spurious signals on empty subcarriers, which can be used to eliminate clipping artifacts and to recover the original signal. Simulations show that a significant reduction of 3 dB in the
... f 3 dB in the headroom of the A/D converter (ADC) is possible, when an elaborate MMSE clip correction algorithm is used. A simple algorithm still allows for 1 dB reduction of the headroom. As the ADC is consuming an ever increasing fraction of the total receiver power, the results are believed to be relevant for lowpower design of OFDM receivers, for instance to prolong battery life during digital television reception on mobile phones. Index Terms-OFDM, analog-to-digital conversion, clipping, IEEE 802.11, DVB-T/H.