Zero excess bandwidth modulation

Details Zero excess bandwidth modulation Zero excess bandwidth modulation

2004-02-17

2009-11-10

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

C375S298000, C375S265000, C375S262000, C375S242000, C375S246000

Reexamination Certificate

active

07616701

ABSTRACT:
ZEB (zero excess bandwidth) modulation. The modulation rate of a signal is increased to the entirety of a communication channel's available bandwidth. Spectral zeroes at the edges of the available bandwidth now coincide with spectral zeroes at the edges of the Nyquist band and lead to ISI (intersymbol interference), which cannot be eliminated by equalization. Thus, in a ZEB system intersymbol interference (ISI) is intentionally allowed and dealt with by the known technique of TH (Tomlinson-Harashima) precoding. Comparison of conventional zero-ISI systems with ZEB systems, both exhibiting identical transmit spectra with finite spectral roll offs towards the edges of the available bandwidth, illustrate significant gains in channel throughput achievable by the ZEB systems. Similar gains can hardly be achieved by more sophisticated channel coding for zero-ISI systems. For ZEB systems an effective spectral shaping involving a simple infinite impulse response (IIR) of the overall channel is proposed.

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Giovanni Cherubini, Evangelos Eleftheriou and Sedat Olcer, Filtered Multitone Modulation for Very High-Speed Digital Subscriber Lines, IEEE Journal On Selected Areas in Communications, vol. 20, No. 5, Jun. 2002, pp. 1016-1028.

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