Pseudo-noise modem and related digital correlation method

Details Pseudo-noise modem and related digital correlation method Pseudo-noise modem and related digital correlation method

1992-11-20

1993-08-17

Swann, Tod

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

052375870

ABSTRACT:
A pseudo-noise (PN) correlation and demodulation method and apparatus, in which received signals are correlated with locally generated PN codes and correlation measurements are maintained for multiple time bins corresponding to signals received over possible multiple paths. Instead of selecting one or a small number of significant correlation measurements to control data demodulation, the method of the invention performs data demodulation over the multiple time bins, and then selects data values corresponding to significant correlation measurements and combines the selected data values, weighting them in accordance with their relative strengths a determined during correlation. Use of the invention provides improved performance in terms of signal quality and continuity in the presence of multipath conditions. Careful selection of design parameters allows the improved performance to be obtained in a compact and easily portable implementation including transmitter and receiver modules.

REFERENCES:
patent: 4485477 (1984-11-01), Nossen
patent: 5029184 (1991-07-01), Andren et al.
patent: 5131006 (1992-07-01), Kamerman et al.
patent: 5166952 (1992-11-01), Omura et al.
patent: 5179573 (1993-01-01), Paradise
patent: 5184135 (1993-02-01), Paradise
"Fast Synchronization in a Spread Spectrum System Bases on Acoustoelectric Convolvers", Brodtkorb, D. et al.; 1978 Ultrasonics Symp Proc IEEE (375/1).

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