Method for the reception and detection of digital signals

Details Method for the reception and detection of digital signals Method for the reception and detection of digital signals

1985-11-05

1988-03-15

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

375102, H04B 110

Patent

active

047318015

ABSTRACT:
Described herein is a method for the reception and the detection of digital signals. According to the method at least two signals (s.sub.1, s.sub.2, . . . , s.sub.M) having at least approximately the same information content are received and out of each received signal (S.sub.i) is generated by means of a phase shift one in-phase baseband signal (s.sub.iI) and one quadrature baseband signal (s.sub.iQ). All in-phase baseband signals (s.sub.iI) are summed in a first summing point (3a) and all quadrature baseband signals (s.sub.iQ) in a second summing point (3b), both sum signals (y.sub.Ik and y.sub.Qk) are fed to a detector (4) for detection and generating two detected output signals (s.sub.Ik and s.sub.Qk), and a reference carrier (ca) is generated as a function of said two sum signals (y.sub.Ik and y.sub.Qk) for carrying out a coherent demodulation. 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.

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