TRANSPOSITIONAL MODULATION SYSTEMS, METHODS AND DEVICES

• US 20160173302A1
• Filed: 03/17/2014
• Published: 06/16/2016
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: TM IP Holdings LLC
• Original Assignee: Medusa Scientific LLC
• Inventors: Gerdes, Richard C.
• Granted Patent: US 9,515,815 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 2027/0051 Harmonic tracking
• CPC Class Codes: H04L 2027/0055 single phase
• CPC Class Codes: H04L 2027/0067 Phase error detectors
• CPC Class Codes: H04L 27/10 Frequency-modulated carrier systems, i.e. using frequency-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 27/12 Modulator circuits; Transmitter circuits
• CPC Class Codes: H04L 27/30 wherein each code element is represented by a combination of frequencies
• CPC Class Codes: H04L 7/0331 with a digital phase-locked loop [PLL] processing binary samples, e.g. add/subtract logic for correction of receiver clock H04L7/0337 takes precedence

Abstract

Systems, methods and devices for transmitting and receiving and demodulating transpositional modulated signals, for increasing information bandwidth of defined communication channels, and for time-delay shifting an input signal in accordance to an input control signal are provided. One such method of increasing the information bandwidth of a defined communication channel includes receiving a first modulated signal having a first carrier signal frequency; receiving a second modulated signal having a second carrier signal frequency, the second modulated signal being modulated with information independent of information modulating the first carrier signal, the second carrier signal frequency being harmonically or sub-harmonically related to the first carrier signal frequency; and combining the first and second signals.

Claims

1. A method of increasing the information bandwidth of a defined communication channel, comprising:

receiving a first modulated signal having a first carrier signal frequency;

receiving a second modulated signal having a second carrier signal frequency, the second modulated signal being modulated with information independent of information modulating the first carrier signal, the second carrier signal frequency being harmonically or sub-harmonically related to the first carrier signal frequency; and

combining the first and second signals.

2. The method of claim 1, wherein the second signal is heterodyned to the frequency of the first carrier signal.

3. The method of claim 1, further comprising:

transmitting the combined signal by a transmitting device;

receiving the combined signal by a receiving device; and

demodulating the second modulated signal from the combined signal using the first carrier signal as a reference.

18. The method of claim 2, further comprising:

transmitting the combined signal by a transmitting device;

receiving the combined signal by a receiving device; and

demodulating the second modulated signal from the combined signal using the first carrier signal as a reference.

4. A time-shift modulator for time-delay shifting an input signal in accordance to an input control signal, comprising an all-pass filter modified with a voltage-controlled time delay.

5. The time-shift modulator of claim 4, wherein the all-pass filter comprises:

an operational amplifier having a feedback resistor connected between the operational amplifier output and the inverting input of the operational amplifier;

a second resistor having a resistance substantially equal to a resistance of the feedback resistor, said second resistor being connected between the inverting input of the operational amplifier and a signal input; and

a series capacitor and resistor network, the series capacitor and resistor network having a first end connected to the signal input, a second end connected to ground, and a mid junction connected to the non-inverting input of the operational amplifier.

6. The time-shift modulator of claim 5, wherein the value of the series capacitor or resistor is modified with a control signal by using a four-quadrant multiplier, with the multiplier output replacing the ground connection of the series capacitor and resistor network, wherein one input of the four-quadrant multiplier is connected to the mid junction of the series capacitor and resistor network, and a second input of the four-quadrant multiplier is connected to the control signal input.

7. A method of increasing communication bandwidth within a fixed communication channel, comprising:

adding a second transpositional modulated signal to a combined signal, the combined signal comprising a first transpositional modulated signal and a first fundamental carrier signal, wherein the second transpositional modulated signal is added to the combined signal using a second fundamental carrier signal having a same frequency as the first fundamental carrier signal, and having a phase angle of 90 degrees with respect to the first fundamental carrier signal.

8. The method of increasing communication bandwidth of claim 7, characterized by one or both of the following features:

(a) wherein the information bandwidth is doubled without increasing the communication channel bandwidth; and

(b) wherein the spectral efficiency of the transpositional modulation is increased.

9. A method for providing an increased ultrasonic communication information bandwidth, characterized by one or more of the following steps:

(a) adding transpositional modulation to an ultrasonic communication signal by direct amplitude modulation of a single ultrasonic transducer;

(b) adding transpositional modulation to an ultrasonic communication signal by directly amplitude modulating a first ultrasonic transducer with the fundamental carrier signal component of transpositional modulation; and

directly amplitude modulating a second ultrasonic transducer with the third harmonic carrier signal component of transpositional modulation;

(c) adding transposition modulation fundamental carrier signal and third harmonic carrier signal components to an ultrasonic communication signal by directly amplitude modulating a single ultrasonic transducer using a wide bandwidth modulation technique;

(d) adding transpositional modulation to an ultrasonic communication signal by directly angle modulating a first ultrasonic transducer with the fundamental carrier signal component of transpositional modulation and directly angle modulating a second ultrasonic transducer with the third harmonic carrier signal component of transpositional modulation; and

(e) adding transposition modulation fundamental carrier signal and third harmonic carrier signal components to an ultrasonic communication signal by directly angle modulating a single ultrasonic transducer using a wide bandwidth modulation technique.

10-13. -13. (canceled)

14. A system for providing increased optical information communication bandwidth, comprising:

an optical beam; and

an optical modulator,

wherein system is configured to directly modulate the optical beam with a transpositional modulation signal.

15. The system of claim 14, wherein the system is configured to amplitude modulate the optical beam with a transpositional modulation signal, or wherein the system is configured to phase modulate the optical beam with the transpositional modulation signal.

16. A method for providing increased optical information communication bandwidth, characterized by one or both of the following steps:

(a) directly modulating an optical beam of a first frequency with a transpositional modulation fundamental carrier frequency component; and

(b) directly modulating an optical beam of a second frequency with a transpositional modulation third harmonic component signal.

17. (canceled)