| Popis: |
Orthogonal Frequency Division Multiplexing (OFDM) is used in high data rate wireless applications due to its ability to cope with frequency selectivity. However, OFDM suffers from high Peak-to-Average Power Ratio (PAPR) problem. Signals with high PAPR require Power Amplifier (PA) to work with large Input-Back-Off (IBO), which reduces the PA efficiency. On the other hand small IBO degrade BER performance and increases out-of-band (OOB) radiation. In literature, there are various PAPR reduction techniques. Among them deliberate clipping is the simplest, that has high deterministic PAPR reduction gain. In this paper, it will be shown that deliberate clipping is worsen the problem and cannot be used without Iterative Clipping Noise Cancellation (ICNC) in the receiver. On the other hand, ICNC increases the computational complexity of the receiver than that of the transmitter, so it recommended to be used in uplinks (ULs). |
