System and methods for dynamic spread spectrum usage

• US 8,675,711 B1
• Filed: 09/24/2010
• Issued: 03/18/2014
• Est. Priority Date: 09/25/2009
• Status: Active Grant

• Current Assignee: Comtech Mobile Datacom Corporation (Comtech Telecommunications Corporation)
• Original Assignee: Comtech Mobile Datacom Corporation (Comtech Telecommunications Corporation)
• Inventors: McDermott, Scott, Fu, Er-Hsien
• Primary Examiner(s): Fan, Chieh M
• Assistant Examiner(s): Badipour, Bahman
• Application Number:
  US12/890,578
• Time in Patent Office: 1,271 Days
• Field of Search: None
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 7/18517 Transmission equipment in earth stations

Abstract

A transmitter transmits a signal to a receiver using spread spectrum signals. The transmitter generates a respective signal. The transmitter separates the respective signal into multiple predefined portions, wherein each predefined portion is below a noise floor. The transmitter transmits at least a plurality of the predefined portions of the respective signal at discrete bandwidth intervals in accordance with a spread spectrum signal splitting technique. The discrete bandwidth intervals are portions of spectrum that are available for transmission. The receiver receives at least a plurality of the multiple predefined portions of the respective signal at the discrete bandwidth intervals. The receiver reconstructs the respective signal using at least a plurality of the predefined portions in accordance with the spread spectrum signal splitting technique.

Claims

1. A method of transmitting a signal to one or more receivers using spread spectrum signals, the method comprising:

at a transmitter having a processor and memory;

obtaining information identifying a plurality of discontinuous discrete bandwidth intervals that are only available for transmission at an energy level below a noise floor;

generating a signal;

separating the signal into a plurality of bits, wherein each of the plurality of bits is configured for transmission in a predefined bandwidth that corresponds to a minimum amount of spectrum required to transmit the bit in a predefined duration; and

transmitting, the plurality of bits in the plurality of discontinuous discrete bandwidth intervals with an energy level such that each of the plurality of bits are transmitted below the noise floor to a satellite via an uplink for further transmission to the one or more receivers via a downlink, wherein at least two bits of the plurality of bits are transmitted in each of the plurality of discontinuous discrete bandwidth intervals and the at least two bits have different center frequencies and are transmitted at the same time,

wherein a respective discontinuous discrete bandwidth interval of the plurality of discontinuous discrete bandwidth intervals includes at least twice the minimum amount of bandwidth necessary to transmit a respective bit of the plurality of bits.

2. A method of transmitting a signal to one or more receivers using spread spectrum signals, the method comprising:

at a transmitter having a processor and memory;

obtaining information identifying a plurality of discontinuous discrete bandwidth intervals that are only available for transmission at an energy level below a noise floor;

generating a signal;

separating the signal into a plurality of bits, wherein each of the plurality of bits is configured for transmission in a customized bandwidth that is determined based on one of the plurality of discontinuous discrete bandwidth intervals; and

transmitting, to a satellite via an uplink for further transmission to the one or more receivers via a downlink, the plurality of bits in the plurality of discontinuous discrete bandwidth intervals with an energy level such that each of the plurality of bits are transmitted below the noise floor, wherein;

the plurality of bits are transmitted for a duration that is determined based on the customized bandwidth of each bit and at least two of the plurality of bits are transmitted simultaneously;

a respective subset of two or more bits of the plurality of bits is transmitted in each of the plurality of discontinuous discrete bandwidth intervals, and the two or more bits in the respective subset of the plurality of bits have a same center frequency and are sequentially transmitted at different times; and

a respective discontinuous discrete bandwidth interval of the plurality of discontinuous discrete bandwidth intervals includes at least twice the minimum amount of bandwidth necessary to transmit a respective bit of the plurality of bits.

3. A transmitter for transmitting a signal to one or more receivers using spread spectrum signals, the transmitter comprising:

a processor; and

memory,

wherein the transmitter is configured to;

obtain information identifying a plurality of discontinuous discrete bandwidth intervals that are only available for transmission at an energy level below a noise floor;

generate a signal;

separate the signal into a plurality of bits, wherein each of the plurality of bits is configured for transmission in a predefined bandwidth that corresponds to a minimum amount of spectrum required to transmit the bit in a predefined duration; and

transmit, the plurality of bits in the plurality of discontinuous discrete bandwidth intervals with an energy level such that each of the plurality of bits are transmitted below the noise floor to a satellite via an uplink for further transmission to the one or more receivers via a downlink, wherein at least two bits of the plurality of bits are transmitted in each of the plurality of discontinuous discrete bandwidth intervals and the at least two bits have different center frequencies and are transmitted at the same time,

wherein a respective discontinuous discrete bandwidth interval of the plurality of discrete bandwidth intervals includes at least twice the minimum amount of bandwidth necessary to transmit a respective bit of the plurality of bits.

4. A transmitter for transmitting a signal to one or more receivers using spread spectrum signals, the transmitter comprising:

a processor; and

memory,

wherein the transmitter is configured to;

obtain information identifying a plurality of discontinuous discrete bandwidth intervals that are only available for transmission at an energy level below a noise floor;

generate a signal;

separate the signal into a plurality of bits, wherein each of the plurality of bits is configured for transmission in a customized bandwidth that is determined based on one of the plurality of discontinuous discrete bandwidth intervals; and

transmit, to a satellite via an uplink for further transmission to the one or more receivers via a downlink, the plurality of bits in the plurality of discontinuous discrete bandwidth intervals with an energy level such that each of the plurality of bits are transmitted below the noise floor, wherein;

the plurality of bits are transmitted for a duration that is determined based on the customized bandwidth of each bit and at least two of the plurality of bits are transmitted simultaneously; and

a respective subset of two or more bits of the plurality of bits is transmitted in each of the plurality of discontinuous discrete bandwidth intervals, and the two or more bits in the respective subset of the plurality of bits have a same center frequency and are sequentially transmitted at different times; and

a respective discontinuous discrete bandwidth interval of the plurality of discontinuous discrete bandwidth intervals includes at least twice the minimum amount of bandwidth necessary to transmit a respective bit of the plurality of bits.