Title :
Quantum detection and mutual information for QAM and PSK signals
Author :
Kato, Kentaro ; Osaki, Masao ; Sasaki, Masahide ; Hirota, Osamu
Author_Institution :
Res. Center for Quantum Commun., Tamagawa Univ., Machida, Japan
fDate :
2/1/1999 12:00:00 AM
Abstract :
We analyze the performance of the error probability and the mutual information for quadrature amplitude modulation (QAM) and phase-shift keying systems based on quantum detection theory. It is shown that the quantum receiver called square root measurement gives about 5.7 dB improvement in power in comparison with the classical one. Furthermore, we show that the quantum QAM system can achieve the same reliability as the conventional intensity modulation-direct detection (IM-DD) system with almost equal power, compressing the required bandwidth, while the reliability is degraded in general
Keywords :
information theory; optical modulation; optical receivers; optical signal detection; phase shift keying; quadrature amplitude modulation; quantum communication; IM-DD system; PSK signals; QAM signals; bandwidth compression; error probability; intensity modulation-direct detection; mutual information; performance; phase-shift keying systems; quadrature amplitude modulation; quantum QAM system; quantum detection; quantum receiver; reliability; square root measurement; Error probability; Information analysis; Mutual information; Performance analysis; Phase detection; Phase shift keying; Power measurement; Power system reliability; Quadrature amplitude modulation; Quantum mechanics;
Journal_Title :
Communications, IEEE Transactions on
