PAPR Reduction in OFDM Systems by Successive Random Sign Negation

Successive random sign negation (SRSN) is a simple yet effective PAPR reduction method for OFDM. The symbols to be transmitted by an OFDM block are successively multiplied by a set of randomly generated sign-negating sequences (SNS). The multiplications continue until a resultant PAPR which falls below a predefined threshold is found or all SNS in the set are tried. In the latter case, the resultant sequence with minimum PAPR is selected. The average number of sign-negating sequences tried before finding a suitable one and the overall PAPR performance of the technique are analyzed, with analytical results well supported by simulations. SRSN provides substantial PAPR reductions comparable to some existing approaches with lower complexity.