Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1985-11-04
1987-10-13
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
455139, H04B 708
Patent
active
047003669
ABSTRACT:
A method for the reception and the detection of digital signals wherein at least two signals (s.sub.1, s.sub.2, . . . s.sub.M) having at least approximately the same information content are received and at least all signals (s.sub.1, s.sub.2, . . . , s.sub.M) but one are subjected to a phase shift. The shifted signals (s'.sub.1, s'.sub.2, . . . , s'.sub.M) are combined in a summing point, the sum signal (s) is fed to a detector for detection, a reference carrier (ca) is generated in a reference carrier generator and a coherent demodulation and detection is carried out in the detector by means of said carrier (ca). According to the invention a projection voltage (z.sub.k) defined by the equation z.sub.k =y.sub.Qk s.sub.Ik -y.sub.Ik s.sub.Qk is generated, wherein y.sub.Ik is a signal sample in the in-phase branch before threshold decision in the detector, y.sub.Qk is the signal sample in the quadrature branch before decision, s.sub.Ik is the detected signal in the in-phase branch, and s.sub.Qk is the detected signal in the quadrature branch.
REFERENCES:
patent: 3911364 (1975-10-01), Langseth et al.
patent: 4354276 (1982-10-01), Karabinis
patent: 4528697 (1985-07-01), Nichols
Oy Nokia AB
Safourek Benedict V.
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