Dual-Polarization OFDM-OQAM Wireless Communication System

Abstract

In this paper we describe the overall idea and results of a recently proposed radio access technique based on filter bank multicarrier (FBMC) communication system using two orthogonal polarizations: dual-polarization FBMC (DP-FBMC). Using this system we can alleviate the intrinsic interference problem in FBMC systems. This enables use of all the multicarrier techniques used in cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM) systems for channel equalization, multiple-input/multiple-output (MIMO) processing, etc., without using the extra processing required for conventional FBMC. DP-FBMC also provides other interesting advantages over CP-OFDM and FBMC such as more robustness in multipath fading channels, and more robustness to receiver carrier frequency offset (CFO) and timing offset (TO). For DP-FBMC we propose three different structures based on different multiplexing techniques in time, frequency, and polarization. We will show that one of these structures has exactly the same system complexity and equipment as conventional FBMC. In our simulation results DP-FBMC has better bit error ratio (BER) performance in dispersive channels. Based on these results, DP-FBMC has potential as a promising candidate for future wireless communication systems.

An Intrinsic Interference Mitigation Scheme for FBMC-QAM Systems

“…However, according to Balian-Low theorem, it is not possible to design well-localized pulseshaping waveforms which also maintain subcarrier orthogonality and satisfy Nyquist criterion at the same time [16]. Thus, prototype filter designs found in the literature are mostly optimized for energy concentration (i.e., localization in time and frequency domain) or rapid sidelobes decay [16]- [20], [23]. Among them, SRRC, Mirrabasi-Martin (same as suggested in the PHY-DYAS project) and IOTA filters are often considered for FBMC-QAM systems, whose frequency responses are restated below.…”