Nonlinear signal correlator and method therefor

Details Nonlinear signal correlator and method therefor Nonlinear signal correlator and method therefor

1995-12-22

1998-07-28

Vo, Don N.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

36472803, 36472806, H03D 100, H04L 2706

Patent

active

057871280

ABSTRACT:
A nonlinear complex signal correlator (129) correlates a complex received signal (123) with a complex reference signal (128) to produce a positive unbiased complex correlation signal (476). The phase component of the received signal (123) and the phase component of the reference signal (128) are added (416-429) at multiple points in time to produce samples of the complex correlation signal (462-475). The samples of the complex correlation signal (462-475) are summed (430) to produce a complex correlation signal (131). A bias (505) of the complex correlation signal (131) is determined (431, 432). The bias (505) is removed (433-446) from each of the samples of the complex correlation signal (462-475) to produce unbiased samples of the complex correlation signal (477-490). An absolute value (447-460) of each of the unbiased samples of the complex correlation signal (477-490) is determined to produce positive unbiased samples of the complex correlation signal (491-504). The positive unbiased samples of the complex correlation signal (491-504) are summed (461) to produce the positive unbiased complex correlation signal (476).

REFERENCES:
patent: 4648098 (1987-03-01), Kerr
patent: 5113415 (1992-05-01), Muto
patent: 5115208 (1992-05-01), Masdea et al.
patent: 5365549 (1994-11-01), Kazecki
patent: 5661764 (1997-08-01), Nakajima
"Difference Detection of /4-Shifted-DQPSK for Digital Cellular Radio"-Sandeep Chennakeshu, & GaryJ>Saulnier--Published IEEE Transactions on Vehicular Technology, vol. 42, No. 1, Feb., 1993.
"Performance of an Implemted Complex Correlator With a Simulated Stationary Dispersive Radio Channel"--Bo Olsson--Published European Conference on Electrotechnics, 1988.

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