Optical fiber communications (2nd ed.): principles and practice
Optical fiber communications (2nd ed.): principles and practice
Adaptive filter theory (3rd ed.)
Adaptive filter theory (3rd ed.)
High-speed wireless infrared communication links
High-speed wireless infrared communication links
Optical interference produced by artificial light
Wireless Networks
Wireless Infrared Communications
Wireless Infrared Communications
The infrared physical layer of the IEEE 802.11 standard for wireless local area networks
IEEE Communications Magazine
Multiple-subcarrier modulation for nondirected wireless infrared communication
IEEE Journal on Selected Areas in Communications
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Infrared has abundant, unregulated bandwidth enabling rapid deployment at low cost. However, safety limits on power emission levels (IEC825), large noise due to ambient lighting, and multipath dispersion remain as hurdles in diffused indoor environments. Especially, the high-frequency periodic interference produced by fluorescent lights is a major concern. Spread spectrum techniques enable low-power operation and noise rejection, at the expense of large processing gain. In this paper, we quantify the noise received and propose an adaptive FIR filter to jointly cancel the multipath dispersion and the fluorescent light noise in an infrared CDMA system. From analytical and simulation results, the adaptive filter significantly enhances the noise rejection capability of the CDMA system and tracks well the quasistationary indoor wireless channel. Our results show tenfold improvement in the BER for a given SNR and processing gain due to the adaptive filter. The filter also performs well in the multiuser environment.