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Lattice Reduction Aided MMSE Tomlinson-Harashima Precoding Based on VBLAST Algorithm for MIMO systems

Journal of Shanghai Jiaotong university(Science) 2008年第1期13卷 12-15页

作者：刘锋蒋铃鸽何晨 Department of Electronic Engineering Shanghai Jiaotong University

A lattice reduction aided (LRA) minimum mean square error (MMSE) Tomlinson-Harashima pre-coding (THP) was proposed based on vertical Bell Labs layered space time (VBLAST) algorithm for multiple input multiple output (MIMO) systems. The extended channel was used to provide optimal tradeoff between residual interference and noise amplification. The processing based on lattice reduction method helps achieve maximal diversity order. The VBLAST algorithm was applied to get the optimal processing ordering for successive interference cancellation (SIC) at transmitter. Simulation results show that the proposed algorithm outperforms conventional THP and the LRA zero-forcing (ZF) THP with full diversity order.

关键词： multiple input multiple output systems lattice reduction vertical Bell Labs layered space time minimum mean square error Tomlinson-Harashima precoding

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Performance of MIMO systems Using Space Time Block Codes (STBC)

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Open Journal of Applied Sciences 2021年第3期11卷 273-286页

作者： Christopher M. Lau Fairleigh Dickinson University Teaneck NJ USA

Digital Communications, in relation to wireless networks, have taken off in recent years due to the expanding need to communicate faster and more efficiently. A popular way to achieve this is by using wireless multiple input multiple output (MIMO) communication systems. MIMO systems utilize Space Time Block Codes (STBC) as one of the leading ways to obtain higher data rates with limited bandwidth and power. With several STBC methods currently available, this paper analyzes simulations using Orthogonal Space Time Block Codes (OSTBC) in Rayleigh fading channels to evaluate the performance of MIMO systems. The selection to use a Rayleigh fading channel as a model for a non-line-of-sight (nLOS) environment is selected to mimic installations where a large number of signal paths and reflections are expected. All simulations are coded, generated and plotted using MATLAB resulting in graphical data representing the bit-error rate (BER) to signal-to-noise ratio (Eb/N0) or SNR. Each simulation captures how different configurations of key variables including code rate, diversity and antenna count can impact system performance. Four modulation schemes (BPSK, QPSK, 16-QAM and 64-QAM) are included in each simulation. Conclusive evidence based upon these simulations suggests higher diversity gains were achieved with a greater number of antennas. The most significant factor for increasing system performance was using a lower count of transmit antennas with a higher count of receive antennas.

关键词： Computer Analysis Digital Communications MATLAB MIMO Modulation Techniques multiple input multiple output systems Orthogonal Space Time Block Codes OSTBC Rayleigh Fading Channels Space Time Block Codes STBC Wireless Communications Wireless Networks

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Reconfigurable Dual Frequency Microstrip MIMO Patch Antenna Using RF MEMS Switches for WLAN Application

Reconfigurable Dual Frequency Microstrip MIMO Patch Antenna ...

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第25届中国控制与决策会议

作者： Hesamedin Joodaki Hossein Valiee Mohammad Bayat Department of Electrical Engineering Khomein Branch Islamic Azad University

ISBN: (纸本)9781467355339

A reconfigurable dual frequency microstrip MIMO patch antenna is designed by reconfiguring it’s size by using another patch, that are connected together via RF MEMS switches. The design has been analyzed for two antenna configurations;the case in which the switches are open resonates at 5.8 GHz and the case in which they are closed resonates at 2.4 GHz. The designed antennas have easy fabrication, low cost and good isolation. The simulation results of scattering parameters are presented.

关键词： MIMO RF MEMS multiple input multiple output systems Microelectromechanical systems radiofrequency Radiofrequency microelectromechanical systems Switches MICROSWITCHES Dual band Patch antennas scattering parameters superconducting microstrips configurability ANTENNA CONFIGURATIONS

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