Data demodulator of a receiving apparatus for spread spectrum co

Details Data demodulator of a receiving apparatus for spread spectrum co Data demodulator of a receiving apparatus for spread spectrum co

1994-04-13

1995-01-17

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

053832205

ABSTRACT:
A data demodulator of a receiving apparatus for spread spectrum communication for removing the phase difference remaining after detection for improving reception quality. In-phase and quadrature axis received signals are multiplied by pseudonoise codes PNI(t) and PNQ(t) and the results are averaged by averaging sections for calculating the correlation. By performing correlation processing, .rho.kO cos .theta., -.rho.O sin .theta., .rho.kO sin .theta., and .rho.kO cos .theta. are output when the amplitude of receive path signal is assumed to be .rho., the phase difference to be .theta., and a proportional constant to be kO. These signals are multiplied by in-phase and quadrature axis received signals and the results are added by adders, thereby removing the effect of the phase difference .theta.. The signal is used for data demodulation and data recovery circuit.

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P. Das et al; "The use of the Hilbert Transform to Double the Information . . . "; National Telecommunications Conference; IEEE Nov. 30, 1980; Houston, Tex.
IEEE Journal on Selected Areas in Communications, vol. 8 No. 4 May, 1990, pp. 503-514 "Increased Capacity Using CDMA for Communication" Gilhousen, et al.

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