Antenna Array Design for LOS-MIMO and Gigabit Ethernet Switch-Based Gbps Radio System

Abstract

The high spectrum efficiency of multiple-input multiple-output (MIMO) transmission traditionally depends on the high multiplexing gain in rich scattering environments, which will not always hold in the line-of-sight (LOS) environments, especially at higher microwave frequency band. In this paper, a novel antenna array design rule is proposed to guarantee full multiplexing gain for LOS-MIMO systems with one- or two-dimensional antenna arrays in LOS scenarios, and the strict perpendicular constraint is released in the two-dimensional case. The minimum antenna array area and the performance sensitivity to the area error are also obtained to guide the practical system design. Then, a demo MIMO-OFDM system with the designed square antenna array at 15 GHz carrier is implemented on a novel Gigabit Ethernet (GE) switch-based software defined radio (SDR) platform, which combines the hardware accelerating units (HAUs) with the general-purpose processors (GPPs). The field evaluation results show that the system throughput and spectrum efficiency are greater than 1 Gbps and 15 bps/Hz, respectively. To the best of our knowledge, it is the first time to demonstrate the Gbps LOS-MIMO-OFDM system at such microwave bands in the world, which can be a successful design example for the next generation wireless backhaul or fixed wireless access.

Antennas for Underwater Wireless Sensor Networks (UWSNs): Reviewing the Challenges of Underwater Communication

“…Multipath propagation, where signals travel along multiple paths before reaching the receiver, can cause signal distortion and fading. Circularly polarized waves can help reduce this effect by ensuring consistent signal reception regardless of the orientation of the receiving antenna [45,46]. Studies by [47,48] showcase the potential of helical antennas for underwater applications.…”

Strong LOS MIMO for Short Range mmWave Communication - Towards 1 Tbps Wireless Data Bus

“…As indicated by [4], [7], [8], and [14], the optimal antenna arrangements are mainly influenced by the carrier wavelength λ, the number of antenna elements N , and the transmit distance D. With high carrier frequency and short distance, the optimal design has the potential for developing ultra-high speed board-to-board communication systems with reasonable antenna sizes. For the parallel uniform linear array (ULA) with N antennas, the optimal antenna spacings d t and d r between antennas at transmitter and receiver side given in [7], [8] satisfy…”

“…Meanwhile, d t,v , d r,v , d t,h , and d r,h for horizontal and vertical directions of the parallel uniform rectangular array (URA) given in [14] satisfy…”

Two-Level Spatial Multiplexing Using Hybrid Beamforming for Millimeter-Wave Backhaul

“…The works in [4], [5] derived optimal antenna arrangements on parallel planes in terms of antenna/subarray distances that provide self-orthogonal LoS channel matrices. However, the same kind of spatial multiplexing remains possible for antenna arrangements on tilted non-parallel planes [6], [7], [8], [9] or for even more complicated 3D arrangements [9].…”