Multispot diffusing configuration for wireless infrared access

Svetla T. Jivkova, Mohsen Kavehrad

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


In order to combine the advantages and to overcome the drawbacks of a direct line-of-sight or a diffuse configuration for wireless infrared access, a multispot diffusing concept utilizing a holographic spot array generator is presented. Simulation results are presented and compared with those for a pure diffuse configuration in terms of link characteristics, when a single-element or a multibranch composite receiver is employed. The multispot transmitter ensures a more uniform signal power distribution. Improvements of about 2 dBo (optical decibels) can be achieved compared to a Lambertian pattern illumination. The increased power path loss at the edges of the communication cell is accompanied with a decrease in the delay spread resulting in an extension of the coverage range. Utilization of angle diversity detection improves signal-to-noise ratio by more than 7 dB when selecting the best receiver branch and more than 10.5 dB in the case of maximal-ratio combining. Use of a multibeam transmitter and an angle diversity receiver reduces the likelihood of shadowing of the receiver due to an obstacle standing along the path between the receiver and the transmitter.

Original languageEnglish (US)
Pages (from-to)970-978
Number of pages9
JournalIEEE Transactions on Communications
Issue number6
StatePublished - Jun 2000

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering


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