Abstract
To enlarge the range of wireless fronthaul and backhaul communication links operating close to the millimeter-wave region, this letter presents a novel line-of-sight (LoS) multiple-input–multiple-output (MIMO) relay system. The analog relay system consists of a simple 90° hybrid coupler to separate two uncorrelated transmit data streams realizing a low complex and cheap system. The functional capability is proven within measurements of two independent 2 × 2 LoS MIMO links at 28 GHz connected by the relay system. A high decoupling of the two independent transmitted data streams of more than 27 dB after the 90° hybrid coupler and a high modulation error rate at the last receiver of around 22 dB could be reached for quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (QAM) modulated signals.
Highlights
T O OVERCOME the bandwidth shortage in the frequency spectrum below 6 GHz, next-generation mobile communication systems will exploit the millimeter-wave spectrum [1]–[3]
To analyze the performance of the relay system, two uncorrelated data streams are generated at the first transmitter
As signal waveform quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (QAM) signals are utilized with a frame length of 2000 symbols
Summary
T O OVERCOME the bandwidth shortage in the frequency spectrum below 6 GHz, next-generation mobile communication systems will exploit the millimeter-wave spectrum [1]–[3]. One interesting frequency band lately specified by the 3rd Generation Partnership Project is the n257 band ranging from 26.5 to 29.5 GHz [4] Within this frequency band, directional high data rate links are required for mobile radio communication networks for fronthaul and backhaul communication [5]. This principle works in contrast to classical spatial multiplexing techniques used in MIMO communication in purely directional links, i.e., communication links without any multipath channel [15], [17]. The concept of a transparent communication link through the relay system by connecting two 2 × 2 LoS MIMO links operating at 28 GHz is proven
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