Synchronization Of Local Oscillations Research Articles

Millimeter-Wave Ultra-Wideband Six-Port Receiver Using Cross-Polarized Antennas

This paper presents a new low-cost millimeter-wave ultra-wideband (UWB) transceiver architecture operating over V-band from 60 to 64 GHz. Since the local oscillator (LO) power required in the operation of six-port receiver is generally low (compared to conventional one using diode mixers), the carrier recovery or LO synchronization is avoided by using second transmission path and cross-polarized antennas. The six-port model used in system simulation is based on -parameters measurements of a rectangular waveguide hybrid coupler. The receiver architecture is validated by comparisons between transmitter and receiver bit sequences and bit error rate results of 500 Mb/s pseudorandom QPSK signal.

Synchronization of Local Oscillations in a Spatial Rock−Scissors−Paper Game Model

We study a spatial rock−scissors−paper model in a square lattice and a quenched small-world network. The system exhibits a global oscillation in the quenched small-world network, but the oscillation disappears in the square lattice. We find that there is a local oscillation in the square lattice the same as in the quenched small-world network. We define (where di is the density of a kind of species and ⟨di⟩ is the average value) as the variance of the oscillation amplitude in a certain local patch. It is found that s decays in a power law with an increase of the local patch size R in the square lattice σ ∝ R−δ, but it remains constant with an increase of the patch size in the quenched small-world network. We can speculate that in the square lattice, superposition between the local oscillations in different patches leads to global stabilization, while in the quenched small-world network, long-range interactions can synchronize the local oscillations, and their coherence results in the global oscillation.