Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1996-07-30
1998-05-19
Ghebretinsae, Temesghen
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375208, 370515, H04L 700
Patent
active
057546045
ABSTRACT:
A method is disclosed for synchronizing, in the presence of sign ambiguity, to a pseudo random maximal length sequence having a characteristic polynomial of order k with a coefficients vector A given by:
where each of the coefficients a.sub.1 to a.sub.k-1 is 1 for an intermediate tap location and otherwise is 0. A received symbol sequence is supplied to and shifted through a K=k+1 stage shift register with P intermediate taps in positions determined by a coefficients vector A.sub.in given by: (a.sub.k-2 .sym.a.sub.k-1) a.sub.k-1 1!
where a.sub.1 and a.sub.k-1 are the inverse of a.sub.1 and a.sub.k-1 respectively and .sym. denotes a modulo-2 sum, whereby the shift register has P intermediate taps where P is a positive integer less than K. A respective correlation signal is recursively added at an input for the received symbol sequence and at each intermediate tap. Each correlation signal is produced by correlating the P+1 signals from said input, intermediate taps, and output other than the signal to which the respective correlation signal is added. The invention is particularly applicable to pilot synchronization in CDMA terminals.
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patent: 5440597 (1995-08-01), Chung et al.
R. B. Ward et al., "Acquisition of Pseudonoise Signals by Recursion-Aided Sequential Estimation", IEEE Transactions on Communications, vol. COM-25, No. 8, Aug. (1977), pp. 784-794.
R. B. Ward, "Acquisition of Pseudonoise Signals by Sequential Estimation", IEEE Transactions on Communications, vol. COM-13, No. 4, Dec. (1965), pp. 475-483.
Bakulin et al., "An Algorithm for Filtering Linear Recurrent Sequences from a Mixture with Noise" Telecommunications and Radio Engineering, vol. 48, No. 9, May (1995), pp. 119-125.
Bakulin et al., Radiotekhnika, vol. 6, Sep. (1994), pp. 68-74.
Bakouline Mikhail
Chloma Alexandre
Kreindeline Vitali
Li Gang
Trofimov Iouri
Ghebretinsae Temesghen
Northern Telecom Limited
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