Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-04-05
1993-03-30
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
370107, 36471511, H04L 700
Patent
active
051990504
ABSTRACT:
A technique for producing detection and synchronization signals with respect to a received pseudo-random (PN) signal, with optimum signal-to-noise performance and reduced complexity and cost of hardware. Correlation of the received signal with early and late reference signals is performed in such a way that multiplication hardware is time-shared to produce an early/late sum signal for use in signal detection, and an early/late difference signal for use in synchronization, but without the degradation of performance usually resulting from time-sharing of components. In one basic form of the invention, the received signal is multiplied by one of the local reference signals, and the resulting product is demultiplexed over two alternate paths for computation of the required sum and difference signals. In a preferred form of the invention, integration of the signals over chip intervals is performed prior to multiplication with the local reference signal, thereby further reducing the hardware complexity eliminating components in the two alternate paths.
REFERENCES:
patent: 4119926 (1978-10-01), Frosch et al.
patent: 4221005 (1980-09-01), La Flame
patent: 4475215 (1984-10-01), Gutleber
Heal Noel F.
Kuntz Curtis
Schivley G. Gregory
Taylor Ronald L.
TRW Inc.
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