tailieunhanh - Báo cáo hóa học: " Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 393768 13 pages doi 2011 393768 Research Article Novel Techniques of Single-Carrier Frequency-Domain Equalization for Optical Wireless Communications Kodzovi Acolatse 1 Yeheskel Bar-Ness 1 and Sarah Kate Wilson2 1 Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 USA 2 Department of Electrical Engineering Santa Clara University Santa Clara CA 95053 USA Correspondence should be addressed to Kodzovi Acolatse ka2@ Received 16 April 2010 Revised 29 July 2010 Accepted 26 September 2010 Academic Editor Naofal Al-Dhahir Copyright 2011 Kodzovi Acolatse et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. We investigate the use of single carrier frequency domain equalization SCFDE over a diffuse optical wireless DOW communications. Recently orthogonal frequency division multiplexing OFDM has been applied to DOW communications. However due to high peak-to-average power ratio PAPR the performance of OFDM can severely be affected by the nonlinear characteristics of light emitting diodes LED . To avoid a PAPR problem we present in this paper a modified form of SCFDE for DOW communications. We propose three different ways of using SCFDE with DOW communications and show that they exhibit lower PAPR and provide better bit-error rate BER performance in the presence of the LED nonlinearity. 1. Introduction Due the increase in the number of portable information terminals in work and at home the demand for highspeed indoor wireless communication has been growing. Recently the optical spectrum which has virtually unlimited bandwidth has been receiving growing interest for use in indoor wireless data transmission 1 2 . Diffuse optical wireless DOW .