BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel
In intensity modulation/direct detection- (IM/DD-) based optical OFDM systems, the requirement of the input signal to be real and positive unipolar imposes a reduction of system performances. Among previously proposed unipolar optical OFDM schemes for optical wireless communications (OWC), asymmetri...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Journal of Computer Networks and Communications |
| Online Access: | http://dx.doi.org/10.1155/2018/9575281 |
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| author | Zelalem Hailu Gebeyehu Philip Kibet Langat Ciira Wa Maina |
| author_facet | Zelalem Hailu Gebeyehu Philip Kibet Langat Ciira Wa Maina |
| author_sort | Zelalem Hailu Gebeyehu |
| collection | DOAJ |
| description | In intensity modulation/direct detection- (IM/DD-) based optical OFDM systems, the requirement of the input signal to be real and positive unipolar imposes a reduction of system performances. Among previously proposed unipolar optical OFDM schemes for optical wireless communications (OWC), asymmetrically clipped optical OFDM (ACO-OFDM) and direct current biased optical OFDM (DCO-OFDM) are the most accepted ones. But those proposed schemes experience either spectral efficiency loss or energy efficiency loss which is a big challenge to realize high speed OWC. To improve the spectral and energy efficiencies, we previously proposed a multistratum-based stratified asymmetrically clipped optical OFDM (STACO-OFDM), and its performance was analyzed for AWGN channel. STACO-OFDM utilizes even subcarriers on the first stratum and odd subcarriers on the rest of strata to transmit multiple ACO-OFDM frames simultaneously. STACO-OFDM provides equal spectral efficiency as DCO-OFDM and better spectral efficiency compared to ACO-OFDM. In this paper, we analyze the BER performance of STACO-OFDM under the effect of multipath fading. The theoretical bit error rate (BER) bound is derived and compared with the simulation results, and good agreement is achieved. Moreover, STACO-OFDM shows better BER performance compared to ACO-OFDM and DCO-OFDM. |
| format | Article |
| id | doaj-art-7d1b70c29c4a47d2a962df9b951a8b40 |
| institution | Kabale University |
| issn | 2090-7141 2090-715X |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Computer Networks and Communications |
| spelling | doaj-art-7d1b70c29c4a47d2a962df9b951a8b402025-02-03T06:48:29ZengWileyJournal of Computer Networks and Communications2090-71412090-715X2018-01-01201810.1155/2018/95752819575281BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath ChannelZelalem Hailu Gebeyehu0Philip Kibet Langat1Ciira Wa Maina2Institute of Science, Technology and Innovation, Pan African University, Nairobi, KenyaJomo Kenyatta University of Agriculture and Technology, Nairobi, KenyaDedan Kimathi University of Technology, Nyeri, KenyaIn intensity modulation/direct detection- (IM/DD-) based optical OFDM systems, the requirement of the input signal to be real and positive unipolar imposes a reduction of system performances. Among previously proposed unipolar optical OFDM schemes for optical wireless communications (OWC), asymmetrically clipped optical OFDM (ACO-OFDM) and direct current biased optical OFDM (DCO-OFDM) are the most accepted ones. But those proposed schemes experience either spectral efficiency loss or energy efficiency loss which is a big challenge to realize high speed OWC. To improve the spectral and energy efficiencies, we previously proposed a multistratum-based stratified asymmetrically clipped optical OFDM (STACO-OFDM), and its performance was analyzed for AWGN channel. STACO-OFDM utilizes even subcarriers on the first stratum and odd subcarriers on the rest of strata to transmit multiple ACO-OFDM frames simultaneously. STACO-OFDM provides equal spectral efficiency as DCO-OFDM and better spectral efficiency compared to ACO-OFDM. In this paper, we analyze the BER performance of STACO-OFDM under the effect of multipath fading. The theoretical bit error rate (BER) bound is derived and compared with the simulation results, and good agreement is achieved. Moreover, STACO-OFDM shows better BER performance compared to ACO-OFDM and DCO-OFDM.http://dx.doi.org/10.1155/2018/9575281 |
| spellingShingle | Zelalem Hailu Gebeyehu Philip Kibet Langat Ciira Wa Maina BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel Journal of Computer Networks and Communications |
| title | BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel |
| title_full | BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel |
| title_fullStr | BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel |
| title_full_unstemmed | BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel |
| title_short | BER Performance of Stratified ACO-OFDM for Optical Wireless Communications over Multipath Channel |
| title_sort | ber performance of stratified aco ofdm for optical wireless communications over multipath channel |
| url | http://dx.doi.org/10.1155/2018/9575281 |
| work_keys_str_mv | AT zelalemhailugebeyehu berperformanceofstratifiedacoofdmforopticalwirelesscommunicationsovermultipathchannel AT philipkibetlangat berperformanceofstratifiedacoofdmforopticalwirelesscommunicationsovermultipathchannel AT ciirawamaina berperformanceofstratifiedacoofdmforopticalwirelesscommunicationsovermultipathchannel |