Peak restoration in ofdm receiver with clipping a/d converter

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 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 low

• Type: Journal
• Year: 2008
• Where: TWC
• Authors: Ronald Rietman, Jean-Paul M. G. Linnartz
• Keywords: Average Power Ratio, Digital Postprocessing Methods, Large Power Back-offs, TWC 2008