Title :
Multiple-subcarrier modulation in optical wireless communications
Author :
Ohtsuki, Tomoaki
Author_Institution :
Tokyo Univ. of Sci., Japan
fDate :
3/1/2003 12:00:00 AM
Abstract :
This article overviews multiple-subcarrier modulation techniques in optical wireless communications. The basic principles and characteristics of MSM techniques in optical wireless communications are presented. MSM optical wireless systems are explained where some block codes that convert information bits to be transmitted to the symbol amplitudes of subcarriers are used to increase the minimum value of the MS electrical waveform. MSM optical communications systems using subcarrier signal point sequences (SSPS) that can improve the power efficiency of MSM systems are also explained. The performance of MSM optical communications systems is presented in the intensity modulation with direct detection (IM/DD) channel without dispersion and in atmospheric optical communications where the effects of scintillation exist.
Keywords :
atmospheric light propagation; block codes; intensity modulation; multipath channels; optical communication; optical links; optical modulation; optical signal detection; atmospheric optical communications; block codes; direct detection channel; electrical waveform; frequency selective channels; information bits; intensity modulation; intersymbol interference; multipath channels; multiple-subcarrier modulation; optical wireless communications; power efficiency; scintillation; subcarrier signal point sequences; subcarriers; symbol amplitudes; systems performance; Block codes; High speed optical techniques; Intensity modulation; Intersymbol interference; Optical fiber communication; Optical modulation; Optical noise; Pulse modulation; Radio frequency; Wireless communication;
Journal_Title :
Communications Magazine, IEEE
DOI :
10.1109/MCOM.2003.1186548
