Please use this identifier to cite or link to this item:
Title: Design and evaluation of a 2 Mbps GMSK modem for short distance infrared wireless communications
Authors: Perez-Jimenez, Rafael 
Montelongo, Cesar
Rabadan, Jose A. 
UNESCO Clasification: 3307 Tecnología electrónica
Keywords: Modulation
Infrared radiation
Wireless communications
Optical filters, et al
Issue Date: 1999
Journal: Proceedings of SPIE - The International Society for Optical Engineering 
Conference: Conference on Optical Wireless Communications II 
Proceedings of the 1999 Optical Wireless Communications II 
Abstract: A carrier-based modem for an IR Wireless LAN (IR-WLAN) design is presented. It is based on GMSK modulation schemes. This modem is capable of operating at 2 Mb/s, but it can easily modify to work up to 4.8 Mb/s. GMSK Schemes are filtered modulation schemes with higher spectral efficiency and robustness against jitter than basic FSK. The emitter uses a pulse-conformation stage for full-digital gaussian pulse conformation. Transitions are codified and the resulting waveform is similar to the output of a gaussian filter. The main applications of the proposed GMSK modem are in the area of a full-duplex IR link. And can be applied either in point-to-point links or into a local area network. It can work without interference wither with IrDA systems (even with the proposed PPM 4.4 Mb/s link) or with IEEE 802.11-baseband link (1 or 2 Mb/s). It is also more spectral efficient and jitter resistant than PPM. Carrier-based systems can be used either in point-to-point links or in diffuse systems. For diffuse systems, this modem assumes a high level of use of the available IR spectrum, supporting at least 4 channels in a 30 MHz bandwidth. We also compare the performances of GMSK with other schemes (as can be OQPSK or FQPSK-2).
ISBN: 0-8194-3443-4
ISSN: 0277-786X
Source: Proceedings of SPIE - The International Society for Optical Engineering[ISSN 0277-786X],v. 3850, p. 64-71
Appears in Collections:Actas de congresos
Show full item record


checked on Apr 18, 2021


checked on Apr 18, 2021

Page view(s)

checked on Apr 18, 2021

Google ScholarTM




Export metadata

Items in accedaCRIS are protected by copyright, with all rights reserved, unless otherwise indicated.