ABSTRACT : |
The signal has a non-constant envelope, i.e. it exhibits peaks whose power strongly exceeds the mean power: the signal is said to have a high Peak-to-Average power Ratio (PAPR). This prevents from the use of high-efficiency amplification devices (High Power Amplifiers, HPA), which exhibit deep non-linearities that give rise to intermodulation products; the latter cause in-band distortion and increase Out-Of-Band Radiation (OOBR), which results in a disturbing Adjacent Channel Interference (ACI) and a Bit-Error-Rate (BER) increase. However OFDM signals have a problem with high Peak-to-Average power ratio (PAPR) and thus, a power amplifier must be carefully manufactured to have a linear input-output characteristic or to have a large input power back-off. Here in this paper, author compares the two methods PTS & SLM approach used for reduction of PAPR.
Keywords: Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), High Power Amplifier (HPA), Partial Transmit Sequence (PTS), Selective Mapping (SLM) |
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