Method and system for enhancing data rates

• US 8,928,524 B1
• Filed: 07/15/2013
• Issued: 01/06/2015
• Est. Priority Date: 11/06/2009
• Status: Active Grant

• Current Assignee: Technology Service Corporation
• Original Assignee: Technology Service Corporation
• Inventors: Nunn, Carroll J., Levitas, Menachem
• Primary Examiner(s): BYTHROW, PETER M
• Application Number:
  US13/844,695
• Time in Patent Office: 540 Days
• Field of Search: 342128-140, 342/159, 342/175, 342/192, 342/195, 343130-153, 343242-254, 343/353
• US Class Current: 342/159
• CPC Class Codes: G01S 13/106 using transmission of pulses having some particular characteristics G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence
• CPC Class Codes: G01S 13/28 with time compression of received pulses
• CPC Class Codes: G01S 7/2883 using FFT processing
• CPC Class Codes: G01S 7/2921 based on data belonging to one radar period

Abstract

The present disclosure relates to the field of pulse compression in signal processing, and more particularly, to systems and methods for the synthesis of waveforms for suppressing sidelobes and sidebands using a combination of time and spectral control. More specifically, the present disclosure relates to a set of waveform symbols which can be used to maximize use of disaggregated grey-space spectrum, adapt to changing spectral condition, and maintain or enhance data rates relative to standard binary phase-shift keying (BPSK) under normal conditions.

Claims

1. A method for enhancing the use of disaggregated spectrum in a system transmitting electromagnetic pulses, comprising:

generating one or more waveform symbol sets,

said waveform symbol set comprising one or more waveforms,

said waveform of one or more waveforms forming a unique code comprising 2 to 16 symbols,

said waveform symbol set being a unique set of codes relative to the codes of the other of the one or more waveform symbol sets,

said waveform symbol set corresponding to a contiguous spectral fragment within the disaggregated spectrum; and

modulating a transmitted pulse in the spectral fragment with a waveform from the waveform symbol set corresponding to the spectral fragment.

2. The method of claim 1, further comprising a first waveform of a first waveform symbol set and a second waveform of the waveform symbol set, said second waveform being orthogonal to the first waveform.

3. The method of claim 2, wherein the waveform symbol set is generated by calculating time-domain derivatives of an objective function, in the frequency domain, to control time domain characteristics of the waveforms in the waveform symbol set that are quantified by the objective function.

4. The method of claim 2, wherein the waveform symbol set is generated by calculating time-domain derivatives of an objective function, in the frequency domain, to control frequency domain characteristics of the waveforms in the waveform symbol set that are quantified by the objective function.

5. The method of claim 3, wherein the time-domain derivatives minimize the objective function.

6. The method of claim 1, further comprising increasing the time duration of the waveform symbol, and increasing the available signal-to-noise ratio.

7. The method of claim 1, further comprising, suppressing sideband interference by applying M-ary phase coding to each waveform in the waveform symbol set.

8. The method of claim 1, further comprising, increasing the data rate by simultaneously assigning each spectral fragment in the disaggregated spectrum to a different amplifier.

9. The method of claim 1, further comprising, increasing the data rate in a linear manner, while increasing total transmitted power in a linear manner.

10. The method of claim 4, wherein the time-domain derivatives minimize the objective function.