Showing papers by "Toshihiko Kosugi published in 2009"
TL;DR: In this article, a 120-GHz-band mm-wave monolithic integrated circuits (MMICs) were fabricated using 0.1-mum-gate InP-HEMTs and coplanar waveguides.
Abstract: We have developed a 120-GHz-band wireless link whose maximum transmission data rate is 11.1 Gbit/s. The wireless link uses millimeter-wave monolithic integrated circuits (MMICs) for the generation of a 120-GHz-band millimeter-wave wireless signal. The MMICs were fabricated using 0.1-mum-gate InP-HEMTs and coplanar waveguides. The wireless link can handle four kinds of data rate for OC-192 and 10-Gbit Ethernet standards with and without forward error correction (FEC). We succeeded in the error-free transmission of a 10-Gbit/s signal over a distance of 800 m. The introduction of FEC into the 120-GHz-band wireless link decreased the minimum received power for error-free transmission, and improved the reliability of the link.
129 citations
TL;DR: In this paper, the effects of rain attenuation on the 120-GHz band wireless link during the heavy rainy period (from July to September, 2008) and annual period(from March to December, 2008).
Abstract: We measured the effects of rain attenuation on 120-GHz band wireless link during the heavy rainy period (from July to September, 2008) and annual period (from March to December, 2008). The heavy rainy period data are used as a basis for the wireless link design, and the annual data are used to calculate the reliability of the wireless link. The 120-GHz band wireless link with V polarization was operated on a 400-m-long path from March to December 2008 in Atsugi, Japan. The rain rate distribution for Atsugi is in good agreement with the conditional M distributions. As for rain attenuation, the annual data coincide with the ITU and Laws and Parsons models. Cumulative distributions of attenuation and bit-error-rate deterioration due to rain were obtained.
57 citations
TL;DR: In this paper, the design and performance of ICs and their waveguide modules for 120-GHz, 10-Gb/s broadband wireless link systems were described and demonstrated using InP HEMTs.
Abstract: Emerging technologies for long-range broadband wireless link systems were introduced. The common problem presented is how to construct a 10-Gb/s modem block with better performance at low cost. A single-carrier system with a simple modulation technique has the advantages of low cost and fast deployment. However, the drawback is poor spectral efficiency. A system using multiple carriers enables higher-order modulation; nevertheless, the hardware is presently very expensive. We described the circuit design and performance of ICs and their waveguide modules for 120-GHz, 10-Gb/s broadband wireless link systems. The demonstration results indicate that the IC modules using InP HEMTs enable us to construct viable 120-GHz millimeter-wave wireless link systems.
38 citations
TL;DR: A millimeter-wave power amplifier module achieves 140mW maximum output power and 80mW output 1-dB gain compression point at 125GHz, setting a record for output power in this frequency band.
Abstract: A millimeter-wave power amplifier module achieves 140mW maximum output power and 80mW output 1-dB gain compression point at 125GHz. The 0.08µm gate length InGaAs/InP composite-channel HEMTs were applied to single-chip coplanar-design amplifier MMIC. The module's output power in this frequency band is a record to the best of our knowledge.
15 citations
07 Jun 2009
TL;DR: In this paper, a propagation study focused on rain attenuation on 120 GHz band wireless link with V polarization was conducted in Atsugi, Japan from December 2007 to September 2008.
Abstract: Results of a propagation study focused on rain attenuation on 120-GHz band wireless link are presented. The 120-GHz band wireless link with V polarization was operated on a 400-m long path from December 2007 to September 2008 in Atsugi, Japan. The rain rate distribution for Atsugi is in good agreement with the conditional M distributions. As for rain attenuation, the effect of water on the antenna radome is large, and the experimental results coincide with the ITU and L-P model. Cumulative distributions of attenuation and BER deterioration due to rain were obtained.
11 citations
07 Jun 2009
TL;DR: In this paper, a 120 GHz band binary phase shift keying (BPSK) modulator and demodulator fabricated on microwave monolithic integrated circuits (MMICs) for a 10Gbit/s wireless link was presented.
Abstract: This paper presents a 120-GHz band binary phase shift keying (BPSK) modulator and demodulator fabricated on microwave monolithic integrated circuits (MMICs) for a 10-Gbit/s wireless link. The direct-conversion modulator consists of a 180° hybrid coupler, gain-control amplifiers, and Wilkinson combiner. The delay demodulator has a 100-ps delay line made of coplanar waveguides and a voltage-controlled phase shifter. The modulator MMIC exhibits a static vector error magnitude of 5%. The modulator and demodulator MMICs were mounted in WR-8 waveguide modules to evaluate the characteristics of 10-Gbit/s transmission. A bit error rate (BER) for 10-Gbit/s pseudorandom binary sequence (PRBS) 27-1 data was 10−12.
8 citations
06 Nov 2009
TL;DR: In this paper, the authors describe 10Gbit/s wireless transmission systems using the 120 GHz band using the HD video transmission system configurations, key devices/modules, transmission characteristics, and experiments on transmitting uncompressed high-definition (HD) video signals.
Abstract: This paper describes 10-Gbit/s wireless transmission systems using the 120-GHz band. System configurations, key devices/modules, transmission characteristics, and experiments on transmitting uncompressed high-definition (HD) video signals are discussed.
5 citations