PAPR analyses for broadband OFDM transmitter with digital IF architecture

As one of main indexes of orthogonal frequency division multiplexing (OFDM) system, peak-to-average power ratio (PAPR) of the time-domain signal has an important effect on system performance. A larger PAPR has to require a wider linear range of power amplifier (PA) in system transmitter, which will greatly decrease the efficiency of PA. In this paper, we introduce a broadband OFDM communication system which is designed and implemented on the basis of digital intermediate frequency (IF) architecture and 1×4 multiple-input multiple-output (MIMO) technology. The parameters and structure of the 1×4 MIMO-OFDM communication system are provided, and its frequency spectrum and time signal are respectively tested. In addition, the PAPR problem is mainly analyzed, and the corresponding experimental results and simulation analyses are also presented.