Title :
Indoors wireless infrared communications based on spread-space holographic CDMA
Author :
Abtahi, Mohammad ; Salehi, Jawad A.
Author_Institution :
Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
Abstract :
We study an application of optical holographic CDMA for free-space (wireless) optical (infrared) indoor communications. First, we describe the principles of the spread-space holographic CDMA indicating the structure of the encoder and decoder and describe mathematically the receiver´s processing module which is comprised of a Fourier transform lens and a holographic matched-filter. Then, we study the performance of an indoors infrared communication link using spot-diffused configuration. Free-space optical holographic CDMA processing gain (PG) can in principle be as high as 106-109 and each user can have different modulating signals (analog or digital), or different information rate with any signal shape. This high PG, can be interpreted as the high capacity of the system to support large number of users with very small bit error rate
Keywords :
code division multiple access; decoding; encoding; error statistics; holography; matched filters; optical communication; optical information processing; optical links; optical receivers; BER; Fourier transform lens; IR communication link; analog signals; bit error rate; decoder; digital signals; encoder; free-space optical indoor communications; holographic matched-filter; indoors wireless IR communications; indoors wireless infrared communications; modulating signals; optical holographic CDMA; performance; processing gain; receiver processing module; signal shape; spot-diffused configuration; spread-space holographic CDMA; system capacity; Decoding; Fourier transforms; Holographic optical components; Holography; Indoor communication; Multiaccess communication; Optical fiber communication; Optical receivers; Signal processing; Wireless communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881561
