Title :
A burst GFSK-modem for wireless LAN systems
Author :
Matsuyama, Koji ; Yoshioka, Shigeyulu ; Shimizu, Masahiko ; Aoki, Nobuhisa ; Tozawa, Yoshiharu
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
Abstract :
In this paper, we present a GFSK modem for use in spread spectrum wireless LAN systems. The proposed digital GFSK modem includes open loop automatic frequency control (AFC) to capture burst data completely. The transmission rate is 1 Mbps. It uses a frequency discriminator for detection and an A/D converter for digital processing. We explain the configuration and the operation of the GFSK modem and show the experimental BER and AFC performance results. The AFC´s performance was evaluated for frequency offsets in both static and Rayleigh fading environments. We found that our demodulator with AFC synchronized within 8 symbols when the frequency shift was more than ±240 kHz. A digital GFSK modem circuit can be fabricated as a digital integrated circuit using only 3,000 gates
Keywords :
Rayleigh channels; automatic frequency control; digital integrated circuits; digital radio; error statistics; frequency shift keying; modems; spread spectrum communication; wireless LAN; 1 Mbit/s; A/D converter; BER; Rayleigh fading environments; burst GFSK-modem; demodulator; detection; digital GFSK modem circuit; digital integrated circuit; frequency discriminator; frequency shift; open loop automatic frequency control; spread spectrum; static environments; transmission rate; wireless LAN systems; Automatic frequency control; Bit error rate; Demodulation; Digital-to-frequency converters; Frequency conversion; Modems; Open loop systems; Rayleigh channels; Spread spectrum communication; Wireless LAN;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1995. PIMRC'95. Wireless: Merging onto the Information Superhighway., Sixth IEEE International Symposium on
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-3002-1
DOI :
10.1109/PIMRC.1995.476883
