Signal processing of a high capacity waveform

• US 9,106,364 B1
• Filed: 01/25/2010
• Issued: 08/11/2015
• Est. Priority Date: 01/26/2009
• Status: Active Grant

• Current Assignee: Comtech Mobile Datacom Corporation (Comtech Telecommunications Corporation)
• Original Assignee: Comtech Mobile Datacom Corporation (Comtech Telecommunications Corporation)
• Inventors: Rampersad, David, Singleton, Mark, Macauley, Douglas, Ting, Wen-Chun
• Primary Examiner(s): Kyle, Tamara T
• Application Number:
  US12/693,116
• Time in Patent Office: 2,024 Days
• Field of Search: 380/270
• US Class Current: 1/1
• CPC Class Codes: H04K 1/00 Secret communication

Abstract

The invention broadly encompasses a signal processor of a High Capacity Waveform (HCW) that includes a method and system for generating the HCW, the method comprising the steps of receiving an encrypted source data packet and modulating a received encrypted source data signal representing the packet, wherein the modulating step further comprises the steps of encoding with high level data link control, scrambling the modulated signal, wherein the scrambling comprises applying digital logic, and encoding the scrambled signal, wherein the encoding comprises using a variable rate low density parity check (LDPC) code for forward error correction (FEC).

Claims

1. A method of generating a high capacity waveform with one or more frames, comprising:

at an electronic device with one or more processors and memory;

receiving encrypted source data;

generating a payload for a respective frame of the high capacity waveform, including;

encoding a portion of the encrypted source data with high level data link control (HDLC);

after encoding the portion of the encrypted source data with HDLC, scrambling the portion of the encrypted source data;

after scrambling the portion of the encrypted source data, encoding the portion of the encrypted source data with a variable rate low density parity check (LDPC) code for forward error correction; and

after encoding the portion of the encrypted source data with LDPC code, modulating the portion of the encrypted source data with a first modulation protocol;

generating one or more pilot and header sequences for the respective frame of the high capacity waveform, including;

modulating the one or more pilot and header sequences with a second modulation protocol different from the first modulation protocol; and

after generating the payload and the one or more pilot and header sequences, generating the respective frame by multiplexing the generated payload and the generated one or more pilot and header sequences.

2. The method of claim 1, including, shaping the respective frame, wherein the shaping comprises using a root raised cosine filter.

3. The method of claim 2, including, digitally upconverting the shaped respective frame.

4. The method of claim 3, including, converting the digitally upconverted respective frame to an analog respective frame.

5. The method of claim 4, including, upconverting the analog respective frame to an intermediate frequency (IF) respective frame.

6. The method of claim 5, including, upconverting the IF respective frame to a C-band respective frame for satellite transmission.

7. The method of claim 6, including, translating the C-band respective frame to an L-band respective frame.

8. The method of claim 7, including, applying channelization filtering to the L-band respective frame.

11. The method of claim 1, wherein the first modulation protocol is selected from one of quadrature phase-shift keying and binary phase-shift keying, and wherein the second modulation protocol is differential binary phase-shift keying.

9. A non-transitory computer-readable storage medium having stored thereon computer-executable instructions that, when executed by one or more processors of an electronic device, cause the device to:

receive encrypted source data;

generate a payload for a respective frame of the high capacity waveform, including;

encoding a portion of the encrypted source data with high level data link control (HDLC);

after encoding the portion of the encrypted source data with HDLC, scrambling the portion of the encrypted source data;

after scrambling the portion of the encrypted source data, encoding the portion of the encrypted source data with a variable rate low density parity check (LDPC) code for forward error correction; and

after encoding the portion of the encrypted source data with LDPC code, modulating the portion of the encrypted source data with a first modulation protocol;

generate one or more pilot and header sequences for the respective frame of the high capacity waveform, including;

modulating the one or more pilot and header sequences with a second modulation protocol different from the first modulation protocol; and

after generating the payload and the one or more pilot and header sequences, generate the respective frame by multiplexing the generated payload and the generated one or more pilot and header sequences.

12. The non-transitory computer-readable storage medium of claim 9, wherein the first modulation protocol is selected from one of quadrature phase-shift keying and binary phase-shift keying, and wherein the second modulation protocol is differential binary phase-shift keying.

10. An electronic device, comprising:

one or more processors; and

memory storing one or more programs to be executed by the one or more processors, the one or more programs comprising instructions for;

receiving encrypted source data;

generating a payload for a respective frame of the high capacity waveform, including;

encoding a portion of the encrypted source data with high level data link control (HDLC);

after encoding the portion of the encrypted source data with HDLC, scrambling the portion of the encrypted source data;

after scrambling the portion of the encrypted source data, encoding the portion of the encrypted source data with a variable rate low density parity check (LDPC) code for forward error correction; and

after encoding the portion of the encrypted source data with LDPC code, modulating the portion of the encrypted source data with a first modulation protocol;

generating one or more pilot and header sequences for the respective frame of the high capacity waveform, including;

modulating the one or more pilot and header sequences with a second modulation protocol different from the first modulation protocol; and

after generating the payload and the one or more pilot and header sequences, generating the respective frame by multiplexing the generated payload and the generated one or more pilot and header sequences.

13. The device of claim 10, wherein the first modulation protocol is selected from one of quadrature phase-shift keying and binary phase-shift keying, and wherein the second modulation protocol is differential binary phase-shift keying.