Method of detecting reference symbols for a digital data receive

Details Method of detecting reference symbols for a digital data receive Method of detecting reference symbols for a digital data receive

1995-11-02

1998-03-24

Ghebretinsae, T.

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

375343, H04L 700

Patent

active

057321140

ABSTRACT:
In a method of detecting reference symbols in a digital data stream constituted by successive frames, each frame contains R reference symbols and I information symbols, and the R reference symbols are uniformly spaced apart in the digital data stream. The received signal is sampled with a period T.sub.e =T.sub.s /N.sub.e, where N.sub.e is an integer not less than 2, and T.sub.s is the symbol time. A cross-correlation is calculated, with each calculated cross-correlation supplying a magnitude I.sub.n equal to: ##EQU1## where x.sub.n+dNe represents the sample received at instant n+dN.sub.e, S*.sub.d,k represents the complex conjugate of the reference symbol of index d, k .epsilon. {0, . . . , R-1} and represents frame index, r=R/q, where q is an integer not less than 1. The cross-correlations are summed over M frames so as to form energy levels J.sub.M,d equal to: ##EQU2## where m is the frame index, M is the number of sums performed, and d .epsilon. {0, . . . , N.sub.e (R+1)-1}. The method further includes a step of detecting the maximum energy level J.sub.M,D =MAX.sub.d J.sub.M,d, the position D of the maximum energy level corresponding to the positions of the reference symbols in the received frames.

REFERENCES:
patent: 5590160 (1996-12-01), Ostman
patent: 5598429 (1997-01-01), Marshall
Patent Abstracts of Japan, vol. 10, No. 164 (E-410), Jun. 11, 1986 corresponding to JP-A-61 016655 (Fujitsu KK) 24 Jan. 1986.

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