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A multiple-layer-overlay (MLO) modulation format is employed for a 14-km optical fiber link and an enhanced spectral efficiency of 2.36 bits/s/Hz is achieved by multiplexing 3-layer signals with each layer carrying a 2-Gbit/s QPSK signal.
We experimentally demonstrate a 400-Gbit/s free-space optical communications link over 120 meters on the building roof by multiplexing four orbital angular momentum (OAM) modes (OAM l = ±1, ±3) each carrying a 100-Gbit/s data channel.
This paper reports an experimental demonstration of a 16 Gbit/s millimeter-wave communication link using MIMO processing of 2 OAM modes on each of two transmitter/receiver antenna apertures. Two groups of multiplexed OAM beams, each containing OAM beams of ℓ =1 and +3 are generated and transmitted through two transmitter apertures respectively. The two transmitter apertures are separated with a certain...
In a heterogeneous wireless network consisting of macrocells and femtocells, it is important for mobile terminals to decide appropriate cell associations when both radio access technologies (RATs) are available. This problem is also known as network selection. Nowadays mobile users are distinct in terms of quality of service (QoS) demand, moving speed and other service preferences, while the conventional...
Nozzle to safe-end joint in Reactor Pressure Vessel (RPV) belongs to Ferrite -Austenite type dissimilar metal weld. It is difficult to perform UT examination because of its coarse grains. Consider of deficient detectability of sub-surface planar defects by angle longitudinal wave technique, a straight longitudinal wave technique which takes safe-end as scanning surface is put forward based on joint...
We experimentally demonstrate an apodized aperture for receiving OAM beams carrying 50-Gbaud QPSK channels. The performance in terms of power in desired mode and leakage to neighboring modes is compared with a hard aperture.
In this article, we address the issue of physical layer design of MIMO wireless communication system. First, we analysis the capacity of MIMO system in a limited space, then investigate the capacity varied with the number of antenna and SNR in SIMO, MISO, MIMO system. Second, we explore the design of antennas assignment and space-time coding based on the optimizing trade-off diversity gains and multiplex...
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