Quadrature multiplexed post correlation IF channel

Claim 2

A receiver apparatus comprising: a local oscillator providing a local oscillator signal; a first code generator providing a first code signal; and a second code generator providing a second code signal; means for combining said first and second code signals, together with said local oscillator signal and said received signal in a quadrature relationship; unitary intermediate frequency amplifier means receiving the output signal from the means for combining for providing an amplified output; and detector means responsive to the intermediate frequency amplified output for forming a first and second detected output signals according to the information in said first and second code signals respectively.

Claim 3

The receiver apparatus of claim 1 wherein said means for combining includes processing means receiving a spread spectrum signal for forming first and second processed signals by a first and a second modulation processes.

Claim 4

The receiver apparatus of claim 2 further comprising means responsive to said first and second detected output signals for controlling said first and second modulation processes.

Claim 5

The receiver apparatus of claim 3 wherein: said processing means includes means for demodulating said spread spectrum signal in response to said in-phase and quadrature signals.

Claim 6

The receiver apparatus of claim 3 wherein: said processing means includes a signal correlator; and said local oscillator signal and at least one of said first and second code signals are combined to provide a code modulated local oscillator signal for correlation with said spread spectrum signal by said correlation means.

Claim 7

The receiver apparatus of claim 5 wherein said signal correlation means comprises an auto-correlator and a cross-correlator for providing said first and second processed signals, respectively.

Claim 8

The receiver apparatus of claim 3 wherein: said controlling means includes means for phase locking a local signal to said first output; and said controlling means further includes means for phase locking a local code signal to said second detected signal.

Claim 9

The receiver apparatus of claim 3 wherein said means for combining further comprises: first mixer means for mixing the output signal of the local oscillator with said first code signal; and second mixer means for mixing the output signal of the local oscillator with said second code signal, wherein said processing means includes means for mixing said spread spectrum signal and the output of said first mixer means and means for mixing the spread spectrum signal and the output of the second mixer means.

Claim 10

The receiver apparatus of claim 8 wherein said processing means includes a Bi-phase modulator.

Claim 11

The receiver apparatus of claim 8 wherein said combining means includes phase shift means wherein the output signals of said processing means for mixing are combined in a quadrature relationship.

Claim 12

The receiver apparatus of claim 8 further including: code generating means for producing a third code signal; and hybrid mixer means for mixing said third code signal with an output of said second mixer means to provide a signal for one of said modulation processes.

Claim 13

The receiver apparatus of claim 11 further comprising channel processor means responsive to said first and said second detected outputs for producing a local oscillator control signal to control said local oscillator and at least one of said code generators.

Claim 14

The receiver apparatus of claim 3 further comprising: means to generate a third code; and means to generate an EARLY CODE, wherein, said processing means comprises: correlator means receiving said spread spectrum signal and said EARLY CODE; mixer means receiving the output of said correlator and said local oscillator signal; modulator means receiving the output of said mixer means and said third code producing a pair of output signals; and means to quadrature combine the output signals of the modulator means, providing an output signal received by said unitary intermediate amplifier means.

Claim 15

A multiplexed IF channel receiver for spread spectrum signals comprising: a code recognition phase-locked loop having means responsive to a received spread spectrum signal for mixing it with an output resulting from mixing a phase-controllable locally generated code signal and a local oscillator signal; a unitary IF amplification channel responsive to the mixed spread spectrum signal, said code recognition phase-locked loop further having means for detecting the mixed spread spectrum signal after amplification by said unitary IF amplification channel to recover a code signal in said spread spectrum signal and for phase-controlling said code signal in response to the recovered code signal; a carrier-locked loop having means responsive to the received spread spectrum signal for mixing it with said phase-controllable locally generated code signal and said local oscillator signal; means for applying the two mixed spread spectrum signals to said unitary IF amplification channel in phase quadrature; and said carrier-locked loop having means for detecting the IF channel amplified signal from the mixing means of said carrier loop independently from the IF channel amplified signal from the mixing means of the code recognition phase-locked loop and for controlling said local oscillator signal to provide carrier phase-locking to said received spread spectrum signal.

Claim 16

A multiplexed IF channel receiver for spread spectrum signals comprising: a code recognition phase-locked loop having means responsive to a received spread spectrum signal for mixing it with an output resulting from mixing a phase-controllable locally generated code signal and a local oscillator signal; a unitary IF amplification channel responsive to the mixed spread spectrum signal, said code recognition phase-locked loop further having means for detecting the mixed spread spectrum signal after amplification by said unitary IF amplification channel to recover a code signal in said spread spectrum signal and for phase-controlling said code signal in response to the recovered code signal; a carrier-locked loop having means responsive to the received spread spectrum signal for mixing it with said phase-controllable locally generated code signal and said local oscillator signal; means for applying the two mixed spread spectrum signals to said unitary IF amplification channel in phase quadrature; and said carrier-locked loop having means for detecting the IF channel amplified signal from the mixing means of said carrier loop independently from the IF channel amplified signal from the mixing means of the code recognition phase-locked loop and for controlling said local oscillator signal to provide carrier phase-locking to said received spread spectrum signal.