A spectrum efficient polarized OFDM scheme for wireless depolarized channel

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.