Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/46872
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
Receivers
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).
URI: http://hdl.handle.net/10553/46872
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
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