Segmentation multi-dimensional crest factor reduction for multi-service supporting digital radio over fibre system

A segmentation multi-dimensional crest factor reduction (SMD-CFR) algorithm is proposed for multi-service supporting digital radio over fibre (DRoF) system. Benefit from segmentation dynamic clipping threshold and clipping factor got basing on characteristics of all service bands, the SMD-CFR is able to get better peak clipping and peak to average power ratio (PAPR) reduction for multi-band combined signal. Simulation results show that SMD-CFR gets more than 2.3 reduction in PAPR for two-bands combined signal of long term evolution (LTE), which is much better than traditional one dimensional (1D)-CFR. Meanwhile, for 64-quadrature amplitude modulation (QAM) modulation and demodulation link, it has very small effect on bit error rate (BER) and error vector magnitude (EVM), which are controlled less than 0.1% and 0.2% respectively. For hardware experiment, SMD-CFR obtains 4.5% increase in drain efficiency and about 4 dBc increase in adjacent channel leakage ratio (ACLR). These are very significant for the wide band power amplifier (PA) in multi-service supporting DRoF system.