Performance evaluation of baseband OOK for wireless indoor infrared LAN's operating at 100 Mb/s

• Published in: IEEE transactions on communications 1995-06, Vol.43 (6), p.2085-2094
• Main Authors: Audeh, M.D., Kahn, J.M.
• Format: Article
• Language: English
• Subjects: Algorithm design and analysis; Analytical models; Applied sciences; Baseband; Degradation; Exact sciences and technology; Indoor environments; Intersymbol interference; Optical fiber communication; Optical signal processing; Performance analysis; Telecommunications; Telecommunications and information theory; Teleprocessing networks. Isdn; Valuation and optimization of characteristics. Simulation; Wireless communication
• ISSN: 0090-6778; 1558-0857
• DOI: 10.1109/26.387449

We investigate 100 Mb/s wireless nondirectional infrared communication in the indoor environment using baseband nonreturn-to-zero (NRZ) on-off keying (OOK) modulation. We show that intersymbol interference induced by multipath propagation impairs detection efficiency. Analytical and simulation results on specific channels demonstrate that an adaptive decision-feedback equalizer adapted according to the least-mean-squares algorithm recovers most of the performance degradation. We also evaluate the performance of a timing-recovery phase-locked loop operating independent of the adaptive equalizer; showing that it quickly and accurately determines the sampling phase with negligible performance degradation. We discuss effective methods of mitigating low-frequency noise induced by fluorescent lighting. We present a packet-based communication method and describe its features and performance. Our results support the feasibility of communication at 100 Mb/s over the infrared channel.< >