A Spectrum Efficient Polarized OFDM Scheme for Wireless Depolarized Channel

摘要

A Polarized OFDM (POFDM) scheme is proposed for the wireless depolarized channel. Through such scheme, each sub-carrier's polarization state, amplitude and phase can be modulated to bear information, and the spectrum efficiency can be further improved. Consider the multi-path fading channel, the channel caused depolarization impairments to POFDM are quantitatively analyzed; to mitigate such impairments, a polarization constellation compensation algorithms is also presented. Furthermore, based on the proposed compensation algorithm, the POFDM's symbol error rate is derived, then the link spectrum efficiency optimization model is established. Through calculation, the optimal modulation ratio is found to maximize POFDM's spectrum efficiency. Finally, both numerical simulations and experimental results show that POFDM can significantly improve the link spectrum efficiency compared with the traditional OFDM scheme.