Showing papers on "L band published in 1994"
28 Feb 1994
17 citations
22 May 1994
TL;DR: In this paper, a configurable array of mixed-signal receiver functions has been developed to address highly integrated receive/transmit applications up to 2 GHz, which is used to implement an IC containing a programmable synthesizer, low-noise frequency down-conversion with variable gain, a 4-bit A-to-D, RMS detector, and frequency upconversion.
Abstract: A configurable array of mixed-signal receiver functions has been developed to address highly integrated receive/transmit applications up to 2 GHz. The array has been used to implement an IC containing a programmable synthesizer, low-noise frequency down-conversion with variable gain, a 4 bit A-to-D, RMS detector, and frequency up-conversion. >
3 citations
22 May 1994
TL;DR: In this article, the authors have demonstrated that all the mobile terminal RF parts can be integrated into a single chip, when using HBT technology, using an on-wafer RF probe.
Abstract: L band HBT MMICs, such as VCOs, mixers, frequency dividers and power transistors, which are required in the handset of the DCS1800 mobile telecommunication system, have been fabricated on the same wafer using a simple HBT process. These different modules have been tested separately using an on-wafer RF probe. All circuits operate as predicted in the DCS1800 frequency range. Furthermore, the VCO has a large bandwidth of 400 MHz, the mixer provides positive conversion gain up to 18.5 GHz, and the power transistor exhibits an output power of 1.8 W with a power added efficiency of 60% at 1.8 GHz. These performances demonstrate that all the mobile terminal RF parts can be integrated into a single chip, when using HBT technology. >
3 citations
08 Mar 1994
TL;DR: In this paper, the authors describe the suitability of low power radio for automatic meter reading (AMR) for British Gas and describe the system atik 3000is product and its suitability for AMR.
Abstract: Low power radio enables the business case for automatic meter reading (AMR) to be satisfied. The Metscan system has developed for British Gas features a very efficient use of the radio spectrum. The author describes Metscan's Systematik 3000is product and the suitability of low-power radio for AMR.<
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3 citations
28 Feb 1994
1 citations
1 citations
04 Jul 1994
TL;DR: A prototype system for the personal satellite communication is proposed and field tests are planned on the S-band frequency using the ETS-VI satellite which will be launched in August 1994.
Abstract: The performance of a direct sequence spread spectrum CDMA communication system in an actual land mobile satellite channel is experimentally evaluated. Field test results using the ETS-V satellite in urban and suburban environments at L-band frequency show that this land mobile satellite channel of 3 MHz bandwidth can be seen as a non-frequency selective Rician fading channel as well as a shadowing channel. The bit error performance can be estimated using signal power measurements as if they were narrow band modulation signals. Based on the experimental results of the ETS-V, a prototype system for the personal satellite communication is proposed and field tests are planned on the S-band frequency using the ETS-VI satellite which will be launched in August 1994. >