Real-world power amplifiers (PAs) are weakly nonlinear. The nonlinear behavior causes subcarrier intermodulation in OFDM based transmitters. This paper shows the results of simulations performed on a software HiperLAN/2 system with a nonlinear power amplifier model. We show that HiperLAN/2 is much less sensitive to nonlinearities of the PA when BPSK or QPSK modulated sub-carriers are used compared to QAM16 or QAM64 modulated sub-carriers. Both QAM16 and QAM64 require a PA backoff amount of at least 5 dB while BPSK and QPSK don't require any backoff. This means that BPSK or QPSK modulated OFDM is more power efficient.
|Title of host publication||The 2nd IEE/EURASIP Conference on DSPenabledRadio|
|Place of Publication||Southampton|
|Number of pages||6|
|Publication status||Published - 19 Aug 2005|
Moseley, N. A., Schiphorst, R., & Slump, C. H. (2005). The effects of nonlinear power amplifiers on the performance of a HiperLAN/2 system. In The 2nd IEE/EURASIP Conference on DSPenabledRadio (pp. 17). Southampton: IEE. https://doi.org/10.1049/ic:20050387