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L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.


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Proceedings ArticleDOI
01 Oct 2017
TL;DR: In this paper, a forward single-stage pump laser and EDFA structure was used for L band EDFA with an uncooled 980 nm pump laser with maximum optical output power of 250 mW.
Abstract: An experiment on L band EDFA is demonstrated by using forward single stage pump laser and EDFA structure. It uses an uncooled 980 nm pump laser with maximum optical output power of 250 mW. The L band EDFA used is 20 m in length with WDM 980/1550 nm couplers as pump power and signal combiner before entering into L band EDFA. The gain can achieve the value of 30 dB with gain variation within 1 dB in 30 nm from 1570–1610 nm spans of ITU grid wavelength. The lowest power starts at −20 dBm and can be amplified up to 3 dBm.

2 citations

Journal Article
TL;DR: In this study, the N-modulation waves model and the 3rd order intercept point input level method (IIP3) in [RC Sagers (1983)] was applied by using parameters of direct spread code division multiple access system as WBMR and personal handyphone system (PHS) as a typical NBMR.
Abstract: At starting of the service operation of 2 GHz band IMT-2000 system in Japan, it is important to make clear the mutual interference problem which may occur between IMT-2000 mobile radio systems and existing mobile radio systems, etc. Concerning about this study, Japanese Association of Radio Industries and Businesses established an investigation and examination meeting from fiscal year 1998 to 2001. After this meeting, especially about nonlinear interference that will occur when interfering wave is very high and nonlinearity of interfered receiver amplifier becomes important, specialist team of nonlinear interference is continuing to study this problem. This paper describes the theoretical study result on intermodulation (IM) spectrum generated by a wideband continuous modulation wave and generation of interfering wave caused by IM, on the nonlinear interference by which a narrowband mobile radio system (NBMR) is disturbed by a wideband mobile radio system (WBMR). In this study, the N-modulation waves model and the 3rd order intercept point input level method (IIP3) in [RC Sagers (1983)] was applied by using parameters of direct spread code division multiple access (DS-CDMA) system as WBMR and personal handyphone system (PHS) as a typical NBMR. The bit error rate characteristics (BER) of PHS receiver were estimated through comparison of measured data and theoretical analysis result of the desired signal and undesired signal ratio (D/U) to BER. The comparison result of estimated and measured BER of a NBWR receiver was reported by using a guard band between WBMR and NBWR system receiver as a parameter.

2 citations

Journal ArticleDOI
TL;DR: The study dealt with the configurations and performance of the 3GPP WCDMA (UTRAN) radio interface over a satellite link and the resultant outcome was reflected in a detail on the G and C families of the satellite radio interface of the ITU-R Recommendation M1457.
Abstract: This paper provides an overview of a technical study on the satellite radio interfaces based on 3GPP WCDMA system. First, the outcome of the technical study is introduced, which has been carried out by the Mobile Satellite System Working Group of the ETSI Satellite Earth Satellite Technical Committee (ETSI TC SES MSS). The study dealt with the configurations and performance of the 3GPP WCDMA (UTRAN) radio interface over a satellite link. Second, as an evolution of satellite-specific radio interface, the study results are addressed on the possible adaptations of WCDMA to the satellite link in order to maximize the radio link performance. The resultant outcome of the study was reflected in a detail on the G and C families of the satellite radio interface of the ITU-R Recommendation M.1457, respectively. Copyright © 2010 John Wiley & Sons, Ltd.

2 citations

Proceedings ArticleDOI
09 Apr 2018
TL;DR: In this article, a preliminary channel model for the satellite-to-aircraft case is presented, based on airborne experiments using Global Positioning System (GPS) signals and the data evaluation.
Abstract: Wireless radio transmission from a satellite based emitter to a receiver located on a aircraft is of interest for many applications such as passenger's internet access, air traffic management or positioning by global navigation satellite systems (GNSSs). Especially, the last two applications listed are related to safety-of-life functionality that requires accurate channel models for software based system testing. State-of-the art channel models for the satellite-to-aircraft case lack of accuracy in terms of modeling all propagation impairments. In this contribution, we describe the airborne experiments using Global Positioning System (GPS) signals and the data evaluation. A preliminary channel model is presented.

2 citations

Proceedings ArticleDOI
01 Sep 2016
TL;DR: In this article, a 5-bit digital phase shifter for L-band SAR is designed using delay line topology and PIN diode switches, which is used to control each antenna's phase.
Abstract: PALSAR (Phased Array L-Band SAR) is a kind of L-Band SAR (Synthetic Aperture Radar) with each antenna in the system is varied by its phase to improve its performance. The PALSAR works in 1.27 GHz with varying bandwidth according to specified PALSAR system. Phased shifter is used to control each antenna's phase. Phase shifter is designed for specified frequency to reach better performance than usual phase shifter. In this paper, 5 bit digital phase shifter for L-Band SAR is designed using delay line topology and PIN diode switches. The result shows RMS error less than 2°, return loss more than 10 dB and insertion loss less than 0.8 dB.

2 citations

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
202222
202134
202036
201944
201838