Abstract
This paper is the first demonstration of multiplexed wideband data transmission in the millimeter-wave range using rectangular-coordinate orthogonal multiplexing (ROM) antennas. This spatial wireless multiplex communication method can be applied at several hundred GHz for further improvements in the data rate because much wider bandwidth is available and this multiplexing method does not require any signal processing. The multiplexing is achieved through the spatial eigenmodes of a novel antenna based on a rectangular coordinate system and magic-T which eliminates the need for computational signal processing efforts. The aperture distributions of these spatial eigenmodes are designed to have different polarities to avoid crosstalk and operate over a wide bandwidth range. We demonstrate their performance with four eigenmodes, achieving crosstalk between modes below −37.8 dB over a 14.6% relative bandwidth (57–66 GHz). We have introduced these antennas on a photonics-enabled real-time wireless data transmission, transmitting over two channels simultaneously, without any signal processing at the transmitter (multiplex) or the receiver (demultiplex). The two multiplexed channels show a total data rate up to 9.0 Gbps at most (5.875 Gbps and 3.125 Gbps for each channel) limited by the bandwidth of the low noise amplifiers at the receiver. The measured bit error rate (BER) is below the forward error correction (FEC) limit.
Highlights
R ECENT network forecasts show the explosive growth in wireless data traffic, urging to find new ways to increase data capacity [1]
This increases crosstalk among the multiple links and the signal to interference and noise ratio (SINR) deteriorates especially when wide bandwidths are used for communication
The detected RF signals are converted to baseband (BB) signals by the Schottky barrier diodes (SBD) and transmitted to the bit error rate tester (BERT) through a low noise amplifier (LNA) and a limiting amplifier (LA)
Summary
R ECENT network forecasts show the explosive growth in wireless data traffic, urging to find new ways to increase data capacity [1]. The current available bandwidth allocated in the microwave range (3 to 30 GHz) is clearly insufficient and different ways to increase the capacity are being explored. Laguerre-Gaussian beam modes [16] are one of the eigenmodes used in OAM multiplexing, wideband generation of these phase distributions by hardware is difficult and bandwidth is limited [12]–[14] This increases crosstalk among the multiple links and the signal to interference and noise ratio (SINR) deteriorates especially when wide bandwidths are used for communication. Promising applications of fiber-based short-range wireless communication include front- and backhauling of base stations, wireless connections over difficult-to-access terrains such as a river, wireless connections in data centers
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