Carrier lock detector

Details Carrier lock detector Carrier lock detector

2007-11-06

2007-11-06

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S332000, C375S340000

Reexamination Certificate

active

10796152

ABSTRACT:
A carrier lock detector for a QPSK or 4-QAM system implements a lock detection algorithm that maps detected signals onto one of first and second areas associated with nominal states defined by (I2⊕I3)·(Q2⊕Q3) andQ1⊕Q2·(I1I2I3+I1I2I3)+(I1⊕I2)·(Q1Q2Q3+Q1Q2Q3), or alternatively, by (I1⊕I2·Q2⊕Q3)+(Q1⊕Q2·I2⊕I3), respectively. When detected signals map onto one of the first areas, a first signal is generated. When detected signals map onto one of the second areas, a second signal is generated. When a difference between the first and second signals exceeds a threshold, a carrier lock detection signal is generated to enable a decoder. The carrier lock detector is able to detect carrier lock at a raw BER of 1e-2 or greater at a very low signal-to-noise ratio.

REFERENCES:
patent: 4736386 (1988-04-01), Nichols
patent: 4987375 (1991-01-01), Wu et al.
patent: 5363408 (1994-11-01), Paik et al.
patent: 5519356 (1996-05-01), Greenberg
patent: 5533059 (1996-07-01), Tsuda

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