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Strictly Bandlimited ISI-Free Transmission Over Intensity-Modulated Channels

Mehrnaz Tavan (Institutionen för signaler och system, Kommunikationssystem) ; Erik Agrell (Institutionen för signaler och system, Kommunikationssystem) ; Johnny Karout (Institutionen för signaler och system, Kommunikationssystem)
IEEE Global Communications Conference, Houston, TX, DEC 05-09, 2011 (1930-529X). (2011)
[Konferensbidrag, refereegranskat]

In this paper, the design and analysis of a new bandwidth-efficient signalling method over the bandlimited intensity-modulated direct-detection (IM/DD) channel is pro- posed. The channel can be modeled as a bandlimited channel with nonnegative input and additive white Gaussian noise. Due to the nonnegativity constraint, the methods previously proposed for conventional bandlimited channels cannot be applied here. We propose a method to transmit without intersymbol interference in a narrower bandwidth compared to previous works, by combining Nyquist pulses with a constant bias. In fact, we can transmit with a bandwidth equal to that of coherent transmission. A trade-off between the required average optical power and the bandwidth is investigated. At low bandwidths, the most power- efficient transmission is obtained by either the parametric linear pulse or the so-called “better than Nyquist” pulse, depending on the exact bandwidth.



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Denna post skapades 2011-09-03. Senast ändrad 2016-04-28.
CPL Pubid: 145762

 

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