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Belle II, an experiment designed to search for physics beyond the standard model in the decay of mesons, will soon start operation at the Super KEKB collider. The trigger rate is expected to be 30 kHz with a margin of 10 kHz, and the raw data rate will exceed 30 GB/s. Since the system will be unable to record all data on its storage system, online reduction is required. We have developed...
In this paper, we investigate a physical layer security technique in an orthogonal frequency-division multiplexing (OFDM) based wireless communications. In an OFDM system, the legitimate transmitter (Alice) can increase secrecy capacity with proper power allocation and/or bit loading methods for example by maximizing mutual information for own communication, i.e. between Alice and the legitimate receiver...
This paper presents an evaluation of the non-linear compensation effect of a base station power amplifier while taking into consideration adjacent channel interference between different mobile communication systems. Adjacent channel interference causes an increase in the receiver noise level due to non-linear distortion components of a base station power amplifier operating in an adjacent channel...
We have developed a 43-Gb/s differential receiver module for RZ-DPSK. A wide bandwidth of 42 GHz and a high transimpedance gain of 58 dBOmega were achieved.
This paper presents a 2-GHz band gallium nitride (GaN) high electron mobility transistor (HEMT) amplifier cryogenically cooled to 60 K as a part of the cryogenic receiver front-end (CRFE) for mobile base station receivers. The GaN HEMT amplifier attains the output power of 3 W and the maximum power added efficiency of 62% with a 50 V drain bias for class-AB operation. The results reported herein are...
We demonstrate 30-Gb/s transmission using 1.1 μm-range VCSELs based on InGaAs/GaAs quantum wells, back-illuminated InGaAs PDs, and TIAs (InP-HBT). Error-free 30-Gbps transmission with 100 m-MMFs (GI32) is achieved for the first time.
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