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Demodulation of a Gosset lattice code having a spectral null at DC

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2 Author(s)
Secord, N. ; Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada ; De Buda, R.

A rarely used definition of the Gosset lattice is revived to construct codes which (unlike other Gosset lattice codes) have a null at DC in their baseband spectrum. A closed-form expression for the code spectrum is derived, and the bandpass spectrum of this code is compared to the spectrum of an E8 construction of the same code. A fast sequential method of demodulation is described. This two-stage demodulator consists of a simplified algorithm that can declare erasures to provide speed in demodulation and a maximum-likelihood algorithm used to maintain error performance

Published in:

Information Theory, IEEE Transactions on  (Volume:35 ,  Issue: 2 )

Date of Publication:

Mar 1989

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