Intersymbol interference in DQPSK fibre-optic systems
Artikel i vetenskaplig tidskrift, 2009

The limited bandwidth of high-speed transmitter and receiver hardware gives rise to intersymbol interference (ISI) in digital communication systems. The influence of such ISI is investigated in a low-complexity fiber-optical setting, using differential quaternary phase shift keying (DQPSK) modulation. The ISI is approximated by a memoryless, stochastic model, for use in applications where neither equalization nor sequence detection can be afforded. The channel capacity of this model is calculated and shown to depend strongly on the transmitter calibration. More than 3 dB is gained, at a target bit error rate of 10^(-6), by allowing the transmitted phase levels to deviate from their nominal multiples of pi/2 by up to 7 %.

Författare

Hongxia Zhao

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Erik Agrell

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Magnus Karlsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

European Transactions on Telecommunications

1124-318X (ISSN) 1541-8251 (eISSN)

Vol. 20 758-769

Ämneskategorier

Telekommunikation

Signalbehandling

DOI

10.1002/ett.1354