US4475243A — Isolation method and apparatus for a same frequen…

Claim 1

Independent Claim 217 words

In a same frequency repeater having a receiver for receiving a desired signal at a given frequency and a transmitter for transmitting an output signal at said given frequency, the desired signal having a first modulation component carrying certain information and the output signal having a second modulation component carrying said information, input signals to the receiver including said desired signal and a spillover signal consisting of said output signal delayed in time, the improvement comprising: a. first receiver means for generating an IF signal carrying said first modulation component and the modulation component of said spillover signal; b. second receiver means for generating an injection signal carrying said second modulation component; c. third receiver means for controlling the phase of one of said second modulation component carried by said injection signal and said modulation component of the spillover signal carried by said IF signal relative to the other according to X=Y+(N) 180° where X is the phase angle of said one, Y is the phase angle of said other, and N is an integer; and d. fourth receiver means for mixing said IF signal and said injection signal to produce a resultant signal in which said one substantially cancels said other whereby the modulation component of the spillover signal is substantially cancelled from said resultant signal.

Claim 2

Dependent Claim 217 words

In a same frequency repeater having a receiver for receiving a desired signal at a given frequency and a transmitter for transmitting an output signal at said given frequency, the desired signal having a first modulation component carrying certain information and the output signal having a second modulation component carrying said information, input signals to the receiver including said desired signal and a spillover signal consisting of said output signal delayed in time, the improvement comprising: a. first receiver means for generating an IF signal carrying said first modulation component and the modulation component of said spillover signal; b. second receiver means for generating an injection signal carrying said second modulation component; c. third receiver means for controlling the phase of one of said second modulation component carried by said injection signal and said modulation component of the spillover signal carried by said IF signal relative to the other according to X=Y+(N) 180° where X is the phase angle of said one, Y is the phase angle of said other, and N is an integer; and d. fourth receiver means for mixing said IF signal and said injection signal to produce a resultant signal in which said one substantially cancels said other whereby the modulation component of the spillover signal is substantially cancelled from said resultant signal.

Claim 3

Dependent Claim 21 words

The improvement according to claim 1 wherein said second generating means includes means for sampling said output signal of the transmitter.

Claim 4

Dependent Claim 21 words

The improvement according to claim 1 wherein said third means comprises a time delay circuit for delaying said one modulation component.

Claim 5

Dependent Claim 268 words

In a same frequency repeater having a receiver for receiving a desired signal at a given frequency and a transmitter for transmitting an output signal at said given frequency, the desired signal having a first modulation component carrying certain information and the output signal having a second modulation component carrying said information, input signals to the receiver including said desired signal and a spillover signal consisting of said output signal delayed in time, the improvement comprising: a. means for generating a receiver first injection signal carrying said second modulation component delayed in time to be in phase with said spillover signal; b. first mixing means for mixing said receiver input signals and said first injection signal to produce a first IF signal having one IF component signal which does not carry said first modulation component nor said second modulation component, and another IF component signal which carries said first modulation component and the modulation component of the spillover signal; c. means for substantially cancelling said one IF component signal; d. means for generating a second injection signal carrying said second modulation component delayed in time to have a phase angle X wherein X=Y+(N) 180°, where Y is the phase angle of the modulation component of the spillover signal carried by said another IF component signal and N is an integer; and e. second mixing means for mixing said another IF component signal and said second injection signal to produce a second IF signal in which the modulation component of said spillover signal is substantially cancelled and in which said first modulation component of said desired signal is present.

Claim 6

Dependent Claim 268 words

In a same frequency repeater having a receiver for receiving a desired signal at a given frequency and a transmitter for transmitting an output signal at said given frequency, the desired signal having a first modulation component carrying certain information and the output signal having a second modulation component carrying said information, input signals to the receiver including said desired signal and a spillover signal consisting of said output signal delayed in time, the improvement comprising: a. means for generating a receiver first injection signal carrying said second modulation component delayed in time to be in phase with said spillover signal; b. first mixing means for mixing said receiver input signals and said first injection signal to produce a first IF signal having one IF component signal which does not carry said first modulation component nor said second modulation component, and another IF component signal which carries said first modulation component and the modulation component of the spillover signal; c. means for substantially cancelling said one IF component signal; d. means for generating a second injection signal carrying said second modulation component delayed in time to have a phase angle X wherein X=Y+(N) 180°, where Y is the phase angle of the modulation component of the spillover signal carried by said another IF component signal and N is an integer; and e. second mixing means for mixing said another IF component signal and said second injection signal to produce a second IF signal in which the modulation component of said spillover signal is substantially cancelled and in which said first modulation component of said desired signal is present.

Claim 7

Dependent Claim 60 words

The improvement according to claim 4 wherein said first injection generating means includes a first time synchronization means for controlling the arrival of said first injection signal at said first mixing means so that said second modulation component carried by the first injection signal arrives in phase at the first mixing means with the modulation component of the spillover signal.

Claim 8

Dependent Claim 37 words

The improvement according to claim 5 wherein said first time synchronization means comprises an adjustable time delay circuit coupled to said first injection generating means for delaying said second modulation component carried by said first injection signal.

Claim 9

Dependent Claim 16 words

The improvement according to claim 4 wherein said cancelling means comprises a correlation and cancellation circuit.

Claim 10

Dependent Claim 47 words

The improvement according to claim 4 wherein said second injection generating means includes a time synchronization means for controlling the phase of said second modulation component carried by the second injection signal relative to the modulation component of the spillover signal carried by the first IF signal.

Claim 11

Dependent Claim 35 words

The improvement according to claim 8 wherein said time synchronization means comprises a time delay circuit coupled to said second injection generating means for delaying said second modulation component carried by said second injection signal.

Claim 12

Dependent Claim 48 words

The improvement according to claim 4 wherein said first injection generating means comprises a first local oscillator, means for sampling the output signal of said transmitter, and a third mixing means for mixing a signal from the first local oscillator and a sample signal from the sampling means.

Claim 13

Dependent Claim 29 words

The invention according to claim 10 further comprising a bandpass filter means coupled to said third mixing means for selecting the resulting summation product from the third mixing means.

Claim 14

Dependent Claim 47 words

The improvement according to claim 4 wherein said second injection generating means comprises a local oscillator, means for sampling the output signal of said transmitter, and a third mixing means for mixing a signal from said second local oscillator and a sample signal from said sampling means.

Claim 15

Dependent Claim 30 words

The improvement according to claim 12 further comprising a bandpass filter means coupled to said third mixer means for selecting the resultant difference output product of said fourth mixing means.

Claim 16

Independent Claim 176 words

A method for substantially cancelling the modulation component of the spillover signal received by the receiver in a same frequency repeater (SFR) from the transmitter in the SFR, said method comprising the steps of: a. generating a receiver first injection signal carrying the modulation component of the transmitter signal; b. mixing the received signal and said first injection signal to produce a first IF signal having one IF signal which does not carry the modulation component of the spillover signal nor the modulation component of a desired received signal, and another IF signal which carries the modulation component of the spillover signal and the modulation component of the desired received signal; c. substantially cancelling said one IF signal; d. generating a receiver second injection signal carrying the modulation component of the transmitter signal; and e. mixing said another IF signal and said second injection signal to produce a receiver second IF signal in which said modulation component of said spillover signal is substantially cancelled and in which said modulation component of the desired signal is present.

Claim 17

Independent Claim 176 words

A method for substantially cancelling the modulation component of the spillover signal received by the receiver in a same frequency repeater (SFR) from the transmitter in the SFR, said method comprising the steps of: a. generating a receiver first injection signal carrying the modulation component of the transmitter signal; b. mixing the received signal and said first injection signal to produce a first IF signal having one IF signal which does not carry the modulation component of the spillover signal nor the modulation component of a desired received signal, and another IF signal which carries the modulation component of the spillover signal and the modulation component of the desired received signal; c. substantially cancelling said one IF signal; d. generating a receiver second injection signal carrying the modulation component of the transmitter signal; and e. mixing said another IF signal and said second injection signal to produce a receiver second IF signal in which said modulation component of said spillover signal is substantially cancelled and in which said modulation component of the desired signal is present.

Claim 18

Dependent Claim 45 words

The method according to claim 14 further comprising the step of synchronizing the first injection signal with the received spillover signal so that the modulation component of the transmitter signal arrives at a first mixer in phase with the modulation component of the spillover signal.

Claim 19

Dependent Claim 60 words

The method according to claim 14 further comprising the step of synchronizing the second injection signal with the first IF signal such that the modulation component of the transmitter signal has a phase angle X according to X=Y+(N) 180° where Y is the phase angle of the spillover modulation component carried by the IF signal, and N is an integer.

Claim 20

Independent Claim 195 words

A method for substantially cancelling the modulation component of the spillover signal received by the receiver in a same frequency repeater (SFR) from the transmitter in the SFR, wherein said receiver receives a desired signal having a first modulation component and the transmitter transmits an output signal having a second modulation component, the spillover signal consisting of said output signal delayed in time, said method comprising the steps of: a. generating a receiver IF signal carrying said first modulation component and the modulation component of said spillover signal; b. generating a receiver injection signal carrying said second modulation component; c. controlling the phase of one of said second modulation component carried by said injection signal and said modulation component of the spillover signal carried by said IF signal relative to the other according to X=Y+(N) 180° where X is the phase angle of said one, Y is the phase angle of said other, and N is an integer; and d. mixing said IF signal and said injection signal to produce a resultant signal in which said one substantially cancels said other whereby the modulation component of the spillover signal is cancelled from said resulting signal.

Claim 21

Independent Claim 195 words

A method for substantially cancelling the modulation component of the spillover signal received by the receiver in a same frequency repeater (SFR) from the transmitter in the SFR, wherein said receiver receives a desired signal having a first modulation component and the transmitter transmits an output signal having a second modulation component, the spillover signal consisting of said output signal delayed in time, said method comprising the steps of: a. generating a receiver IF signal carrying said first modulation component and the modulation component of said spillover signal; b. generating a receiver injection signal carrying said second modulation component; c. controlling the phase of one of said second modulation component carried by said injection signal and said modulation component of the spillover signal carried by said IF signal relative to the other according to X=Y+(N) 180° where X is the phase angle of said one, Y is the phase angle of said other, and N is an integer; and d. mixing said IF signal and said injection signal to produce a resultant signal in which said one substantially cancels said other whereby the modulation component of the spillover signal is cancelled from said resulting signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-10-02	1988-04-02	1988-10-02	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-10-02	1992-04-02	1992-10-02	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-10-02	1996-04-02	1996-10-02	$7700.00	Window Closed / Lapsed

Isolation method and apparatus for a same frequency repeater

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