On Max-SINR Receiver for Hexagonal Multicarrier Transmission System

On Max-SINR Receiver for Hexagonal Multicarrier Transmission System

Kui Xu (PLA University of Science and Technology, China), Youyun Xu (PLA University of Science and Technology, China), Dongmei Zhang (PLA University of Science and Technology, China) and Wenfeng Ma (PLA University of Science and Technology, China)
DOI: 10.4018/978-1-4666-4888-3.ch004
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Abstract

In this chapter, a novel receiver for Hexagonal Multicarrier Transmission (HMT) system based on the maximizing Signal-to-Interference-plus-Noise Ratio (Max-SINR) criterion is proposed. Theoretical analyses show that there is a timing offset between the prototype pulses of the proposed Max-SINR receiver and the traditional projection receiver. Meanwhile, the timing offset should be matched to the channel scattering factor of the Doubly Dispersive (DD) channel. The closed form timing offset expressions of the prototype pulse for Max-SINR HMT receiver over DD channel with different channel scattering functions are derived. Simulation results show that the proposed Max-SINR receiver outperforms traditional projection scheme and obtains an approximation to the theoretical upper bound SINR performance within the full range of channel spread factor. Consistent with the SINR performance improvement, the Bit Error Rate (BER) performance of the HMT system has also been further improved by using the proposed Max-SINR receiver. Meanwhile, the SINR performance of the proposed Max-SINR receiver is robust to the channel delay spread estimation errors.
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Background

It is shown in (Strohmer T, & Beaver S., 2003, Han F. M., & Zhang X. D., 2007, Han F.M., & Zhang X.D., 2009, Han F. M., & Zhang X.D., 2010) that signal transmission through a rectangular lattice is suboptimal for doubly dispersive (DD) channel. By using results from sphere covering theory (Conway J. H. & Sloane N. J. A., 1998), the authors have demonstrated that lattice OFDM (LOFDM) system, which is OFDM system based on hexagonal-type lattice, providing better performance against ISI/ICI (Strohmer & Beaver, 2003). However, LOFDM confines the transmission pulses to a set of orthogonal ones. As pointed out in (Han & Zhang, 2007), these orthogonalized pulses destroy the time-frequency (TF) concentration of the initial pulses, hence lower the robustness to the time and frequency dispersion caused by the DD propagation channel.

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