Papr

PAPR effect on LNA, ADC and PA

PAPR effect on LNA, ADC and PA
  1. How does PAPR affect OFDM?
  2. Why high PAPR in OFDM?
  3. How does a high peak to average power ratio affect OFDM system?

How does PAPR affect OFDM?

OFDM has several properties which make it an attractive modulation scheme for high speed transmission. the main draw back of OFDM is high PAPR. The high PAPR causes the interference and degraded the performance of the system while OFDM signal pass through the amplifier.

Why high PAPR in OFDM?

The PAPR is rather high in OFDM due to the linear combination of many (pseudo-random) QAM symbols in the IFFT operation (5.3). Hence, due to the central limit theorem, some output OFDM symbols will have very large PAPR. To mitigate this, a DFT precoding of the sequence of QAM symbols can be used.

How does a high peak to average power ratio affect OFDM system?

However, one of the most serious problems is the high Peak-to-Average Power Ratio (PAPR) of the transmitted OFDM signal, since this large peaks introduce a serious degradation in performance when the signal passes through a nonlinear High-Power-Amplifier (HPA).

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