Passive Phase Conjugation Applied to an OFDM-Based Terrestrial Communication System

The demand for high-data-rate radio systems that can robustly operate in multipath environments presents challenging technical issues. In this paper, we propose a passive phase conjugation (PPC)-based orthogonal frequency-division multiplexing (OFDM) system. Compared with the conventional OFDM system, the proposed system achieves lower computational complexity since the need for conventional channel estimation and equalization can be eliminated. The performance gain of the proposed technique is shown to be particularly advantageous in systems with multiple receiver array elements. Numerical results are provided to illustrate the performance of the system when operating through a multipath radio channel. We also derive a closed-form formula that can be used to predict the performance of the proposed scheme over multipath channels with a uniform power delay profile. Our analysis validates the simulation results and provides insights into the behavior of wireless centric OFDM-PPC systems.