Koninklijke Philips Corporation N.v.

Philips Electronics North America Corporation

Philips Electronics N.a. Corporation

Mariam Motamed

Farbod Kamgar

Antoine Jean Rouphael

Antoine J Rouphael, Iii

In response to an error signal, a pseudo-noise generator ( or ) generates an on-time pseudo-noise signal, an early pseudo-noise signal delayed by less than one-half of a chip interval, and a late pseudo-noise signal advanced by less than one-half of a chip interval. A correlator ( and , or ) correlates a received signal with the early and late pseudo-noise signals to generate the error signal. The combination of the pseudo-noise generator ( or ) and the correlator ( and , or ) creates a loop in which the on-time pseudo-noise signal tracks a received pseudo-noise code more closely than in prior art devices and enables a deinterleave and decode device ( ) within the receiver to demodulate the received signal more effectively.

Apparatus and method for locking onto a psuedo-noise code in an IS-95 spread spectrum communications system

A controlled receive device is disclosed having an amplifier circuit, which receives an input signal, and a control circuit which receives the input signal and outputs a controlled signal to a receiver. The receiver outputs an output signal. A controller varies the gain of the amplifier circuit in response to levels of the controlled signal and the output signal. The control circuit outputs a controlled indicator signal indicative of a level of the controlled signal and the receiver outputs an output indicator signal indicative of the output signal level. The controlled indicator signal and the output indicator signal are compared using comparators, to respective reference or threshold levels for producing control signals used by the controller for varying the amplifier gain.

LNA control-circuit for receive closed loop automatic gain control

A pseudo-noise generator (,) generates an on-time component, an early component and a late component of a pseudo-noise code signal in response to an error signal. The on-time component is routed to a deinterleave and demodulate device (,) which demodulates and decodes baseband signals from received spread spectrum signals. An adder (,) subtracts the early component from the late component to form a summation signal. A multiplier (,) multiplies the summation with the received signal to form a product signal. An integrator (,) integrates the product signal to form the error signal. The error signal is fed back into the pseudo-noise generator (,) to fine tune the on-time component, the early component and the late component of the pseudo-noise code signal. As a result, a spread spectrum signal is demodulated and decoded using only one correlator (,) instead of two.

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Mariam Motamed