Bandlimited Intensity Modulation
Artikel i vetenskaplig tidskrift, 2012

In this paper, the design and analysis of a new bandwidth-efficient signaling method over the bandlimited intensity-modulated direct-detection (IM/DD) channel is presented. The channel can be modeled as a bandlimited channel with nonnegative input and additive white Gaussian noise (AWGN). Due to the nonnegativity constraint, standard methods for coherent bandlimited channels cannot be applied here. Previously established techniques for the IM/DD channel require bandwidth twice the required bandwidth over the conventional coherent channel. We propose a method to transmit without intersymbol interference in a bandwidth no larger than the bit rate. This is done by combining Nyquist or root-Nyquist pulses with a constant bias and using higher-order modulation formats. 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. Depending on the bandwidth required, the most power-efficient transmission is obtained by the parametric linear pulse, the so-called "better than Nyquist" pulse, or the root-raised cosine pulse.

indoor infrared channels

space

gaussian-noise

optical communications

communication

pulses

filters

multiple-subcarrier modulation

high-speed

Intensity-modulated direct-detection (IM/DD)

capacity bounds

strictly bandlimited signaling

nyquist

transmission

Författare

M. Tavan

Rutgers, The State University of New Jersey

Erik Agrell

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Johnny Karout

Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

IEEE Transactions on Communications

0090-6778 (ISSN)

Vol. 60 3429-3439 6315966

Ämneskategorier

Telekommunikation

DOI

10.1109/tcomm.2012.091712.110496