A Trellis Shaping for Peak and Average Power Reduction of BICM-OFDM Signals


One in every of the major drawbacks of orthogonal frequency-division multiplexing (OFDM) systems is their high peak-to-average power ratio (PAPR) signals, and trellis shaping (TS) may be a promising approach for reducing both peak power and average power of OFDM signals. In practice, OFDM should be used with coded modulation for improving reliability, and bit-interleaved coded modulation (BICM) has been usually combined with OFDM to realize robustness against severe fading channels. In this work, we propose a replacement BICM-OFDM system concatenated with TS for achieving good error performance. To the present finish, a novel soft-in-soft-out decoder for TS is developed. Optimization of the shaping convolutional code in terms of transmitter performance is also mentioned. The effectiveness of our system is demonstrated through the analysis in terms of average mutual data also frame error rate (FER) over an additive white Gaussian noise channel. Furthermore, the FER is evaluated over a frequency-selective Rayleigh fading channel and compared with the theoretical outage likelihood. The simulation results reveal that our system can achieve sensible frequency diversity impact over such a fading channel while enjoying a lot of lower PAPR.

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