Method and device enabling a modem to be synchronized with an RF

Details Method and device enabling a modem to be synchronized with an RF Method and device enabling a modem to be synchronized with an RF

1997-06-27

1998-09-22

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Utilizing correlation techniques

342380, 342383, G01S 316

Patent

active

058120904

ABSTRACT:
The method consists in estimating the matrix of correlation R.sub.XX of the signals received on a set of N reception sensors, computing the reverse correlation matrix R.sub.XX.sup.-n, computing vectors of intercorrelation r.sub.Xd between the signals received on the set of the N sensors and a known replica signal d(k), computing a criterion of synchronization in calculating the products of the conjugate, transposed intercorrection vectors R.sub.XX.sup.-n and of the matrix of the intercorrelation vector r.sub.Xdi and comparing the value of the criterion obtained with a determined threshold value 1 to place the synchronization on the sample for which the value of the criteria exceeds the threshold value .eta.. To estimate the Doppler shift the synchronization sequence is subdivided into a determined number of sections of symbols to carry out fast Fourier transform computations on determined intercorrelation vectors in each section.

REFERENCES:
patent: 4752969 (1988-06-01), Rilling
patent: 5144322 (1992-09-01), Gabriel
patent: 5481505 (1996-01-01), Donald et al.
IEEE Transactions On Aerospace and Electronic Systems, vol. AES 18. No. 1, Jan. 1982 "An Adaptive Array Signal Processing Algorithm for Communications", by Lawrence E. Brennan and Irving S. Reed, pp. 124-129.

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